1576 lines
43 KiB
ArmAsm
1576 lines
43 KiB
ArmAsm
.explicit
|
||
.text
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||
.ident "ia64.S, Version 1.2"
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.ident "IA-64 ISA artwork by Andy Polyakov <appro@fy.chalmers.se>"
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||
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//
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// ====================================================================
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||
// Written by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
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// project.
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//
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// Rights for redistribution and usage in source and binary forms are
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// granted according to the OpenSSL license. Warranty of any kind is
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// disclaimed.
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// ====================================================================
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//
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// Q. How much faster does it get?
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// A. Here is the output from 'openssl speed rsa dsa' for vanilla
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// 0.9.6a compiled with gcc version 2.96 20000731 (Red Hat
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// Linux 7.1 2.96-81):
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//
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// sign verify sign/s verify/s
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// rsa 512 bits 0.0036s 0.0003s 275.3 2999.2
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// rsa 1024 bits 0.0203s 0.0011s 49.3 894.1
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// rsa 2048 bits 0.1331s 0.0040s 7.5 250.9
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// rsa 4096 bits 0.9270s 0.0147s 1.1 68.1
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// sign verify sign/s verify/s
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// dsa 512 bits 0.0035s 0.0043s 288.3 234.8
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// dsa 1024 bits 0.0111s 0.0135s 90.0 74.2
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//
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// And here is similar output but for this assembler
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// implementation:-)
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//
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// sign verify sign/s verify/s
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// rsa 512 bits 0.0021s 0.0001s 549.4 9638.5
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// rsa 1024 bits 0.0055s 0.0002s 183.8 4481.1
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// rsa 2048 bits 0.0244s 0.0006s 41.4 1726.3
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// rsa 4096 bits 0.1295s 0.0018s 7.7 561.5
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// sign verify sign/s verify/s
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// dsa 512 bits 0.0012s 0.0013s 891.9 756.6
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// dsa 1024 bits 0.0023s 0.0028s 440.4 376.2
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//
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// Yes, you may argue that it's not fair comparison as it's
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// possible to craft the C implementation with BN_UMULT_HIGH
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// inline assembler macro. But of course! Here is the output
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// with the macro:
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//
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// sign verify sign/s verify/s
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// rsa 512 bits 0.0020s 0.0002s 495.0 6561.0
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// rsa 1024 bits 0.0086s 0.0004s 116.2 2235.7
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// rsa 2048 bits 0.0519s 0.0015s 19.3 667.3
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// rsa 4096 bits 0.3464s 0.0053s 2.9 187.7
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// sign verify sign/s verify/s
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// dsa 512 bits 0.0016s 0.0020s 613.1 510.5
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// dsa 1024 bits 0.0045s 0.0054s 221.0 183.9
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//
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// My code is still way faster, huh:-) And I believe that even
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// higher performance can be achieved. Note that as keys get
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// longer, performance gain is larger. Why? According to the
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// profiler there is another player in the field, namely
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// BN_from_montgomery consuming larger and larger portion of CPU
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// time as keysize decreases. I therefore consider putting effort
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// to assembler implementation of the following routine:
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//
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// void bn_mul_add_mont (BN_ULONG *rp,BN_ULONG *np,int nl,BN_ULONG n0)
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// {
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// int i,j;
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// BN_ULONG v;
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//
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// for (i=0; i<nl; i++)
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// {
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// v=bn_mul_add_words(rp,np,nl,(rp[0]*n0)&BN_MASK2);
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// nrp++;
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// rp++;
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// if (((nrp[-1]+=v)&BN_MASK2) < v)
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// for (j=0; ((++nrp[j])&BN_MASK2) == 0; j++) ;
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// }
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// }
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//
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// It might as well be beneficial to implement even combaX
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// variants, as it appears as it can literally unleash the
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// performance (see comment section to bn_mul_comba8 below).
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//
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// And finally for your reference the output for 0.9.6a compiled
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// with SGIcc version 0.01.0-12 (keep in mind that for the moment
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// of this writing it's not possible to convince SGIcc to use
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// BN_UMULT_HIGH inline assembler macro, yet the code is fast,
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// i.e. for a compiler generated one:-):
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//
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// sign verify sign/s verify/s
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// rsa 512 bits 0.0022s 0.0002s 452.7 5894.3
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// rsa 1024 bits 0.0097s 0.0005s 102.7 2002.9
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// rsa 2048 bits 0.0578s 0.0017s 17.3 600.2
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// rsa 4096 bits 0.3838s 0.0061s 2.6 164.5
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// sign verify sign/s verify/s
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// dsa 512 bits 0.0018s 0.0022s 547.3 459.6
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// dsa 1024 bits 0.0051s 0.0062s 196.6 161.3
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//
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// Oh! Benchmarks were performed on 733MHz Lion-class Itanium
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// system running Redhat Linux 7.1 (very special thanks to Ray
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// McCaffity of Williams Communications for providing an account).
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//
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// Q. What's the heck with 'rum 1<<5' at the end of every function?
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// A. Well, by clearing the "upper FP registers written" bit of the
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// User Mask I want to excuse the kernel from preserving upper
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// (f32-f128) FP register bank over process context switch, thus
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// minimizing bus bandwidth consumption during the switch (i.e.
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// after PKI opration completes and the program is off doing
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// something else like bulk symmetric encryption). Having said
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// this, I also want to point out that it might be good idea
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// to compile the whole toolkit (as well as majority of the
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// programs for that matter) with -mfixed-range=f32-f127 command
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// line option. No, it doesn't prevent the compiler from writing
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// to upper bank, but at least discourages to do so. If you don't
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// like the idea you have the option to compile the module with
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// -Drum=nop.m in command line.
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//
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#if 1
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//
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// bn_[add|sub]_words routines.
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//
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// Loops are spinning in 2*(n+5) ticks on Itanuim (provided that the
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// data reside in L1 cache, i.e. 2 ticks away). It's possible to
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// compress the epilogue and get down to 2*n+6, but at the cost of
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// scalability (the neat feature of this implementation is that it
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// shall automagically spin in n+5 on "wider" IA-64 implementations:-)
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// I consider that the epilogue is short enough as it is to trade tiny
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// performance loss on Itanium for scalability.
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//
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// BN_ULONG bn_add_words(BN_ULONG *rp, BN_ULONG *ap, BN_ULONG *bp,int num)
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//
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.global bn_add_words#
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.proc bn_add_words#
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.align 64
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.skip 32 // makes the loop body aligned at 64-byte boundary
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bn_add_words:
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.prologue
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.fframe 0
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.save ar.pfs,r2
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{ .mii; alloc r2=ar.pfs,4,12,0,16
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cmp4.le p6,p0=r35,r0 };;
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{ .mfb; mov r8=r0 // return value
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(p6) br.ret.spnt.many b0 };;
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.save ar.lc,r3
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{ .mib; sub r10=r35,r0,1
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mov r3=ar.lc
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brp.loop.imp .L_bn_add_words_ctop,.L_bn_add_words_cend-16
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}
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.body
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{ .mib;
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#if defined(_HPUX_SOURCE) && defined(_ILP32)
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addp4 r14=0,r32 // rp
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#else
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mov r14=r32 // rp
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#endif
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mov r9=pr };;
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{ .mii;
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#if defined(_HPUX_SOURCE) && defined(_ILP32)
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addp4 r15=0,r33 // ap
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#else
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mov r15=r33 // ap
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#endif
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mov ar.lc=r10
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mov ar.ec=6 }
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{ .mib;
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#if defined(_HPUX_SOURCE) && defined(_ILP32)
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addp4 r16=0,r34 // bp
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#else
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mov r16=r34 // bp
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#endif
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mov pr.rot=1<<16 };;
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.L_bn_add_words_ctop:
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{ .mii; (p16) ld8 r32=[r16],8 // b=*(bp++)
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(p18) add r39=r37,r34
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(p19) cmp.ltu.unc p56,p0=r40,r38 }
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{ .mfb; (p0) nop.m 0x0
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(p0) nop.f 0x0
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(p0) nop.b 0x0 }
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{ .mii; (p16) ld8 r35=[r15],8 // a=*(ap++)
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(p58) cmp.eq.or p57,p0=-1,r41 // (p20)
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(p58) add r41=1,r41 } // (p20)
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{ .mfb; (p21) st8 [r14]=r42,8 // *(rp++)=r
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(p0) nop.f 0x0
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br.ctop.sptk .L_bn_add_words_ctop };;
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.L_bn_add_words_cend:
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{ .mii;
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(p59) add r8=1,r8 // return value
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mov pr=r9,0x1ffff
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mov ar.lc=r3 }
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{ .mbb; nop.b 0x0
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br.ret.sptk.many b0 };;
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.endp bn_add_words#
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//
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// BN_ULONG bn_sub_words(BN_ULONG *rp, BN_ULONG *ap, BN_ULONG *bp,int num)
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//
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.global bn_sub_words#
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.proc bn_sub_words#
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.align 64
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.skip 32 // makes the loop body aligned at 64-byte boundary
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bn_sub_words:
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.prologue
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.fframe 0
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.save ar.pfs,r2
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{ .mii; alloc r2=ar.pfs,4,12,0,16
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cmp4.le p6,p0=r35,r0 };;
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{ .mfb; mov r8=r0 // return value
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(p6) br.ret.spnt.many b0 };;
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.save ar.lc,r3
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{ .mib; sub r10=r35,r0,1
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mov r3=ar.lc
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brp.loop.imp .L_bn_sub_words_ctop,.L_bn_sub_words_cend-16
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}
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.body
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{ .mib;
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#if defined(_HPUX_SOURCE) && defined(_ILP32)
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addp4 r14=0,r32 // rp
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#else
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mov r14=r32 // rp
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#endif
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mov r9=pr };;
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{ .mii;
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#if defined(_HPUX_SOURCE) && defined(_ILP32)
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addp4 r15=0,r33 // ap
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#else
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mov r15=r33 // ap
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#endif
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mov ar.lc=r10
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mov ar.ec=6 }
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{ .mib;
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#if defined(_HPUX_SOURCE) && defined(_ILP32)
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addp4 r16=0,r34 // bp
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#else
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mov r16=r34 // bp
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#endif
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mov pr.rot=1<<16 };;
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.L_bn_sub_words_ctop:
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{ .mii; (p16) ld8 r32=[r16],8 // b=*(bp++)
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(p18) sub r39=r37,r34
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(p19) cmp.gtu.unc p56,p0=r40,r38 }
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{ .mfb; (p0) nop.m 0x0
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(p0) nop.f 0x0
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(p0) nop.b 0x0 }
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{ .mii; (p16) ld8 r35=[r15],8 // a=*(ap++)
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(p58) cmp.eq.or p57,p0=0,r41 // (p20)
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(p58) add r41=-1,r41 } // (p20)
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{ .mbb; (p21) st8 [r14]=r42,8 // *(rp++)=r
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(p0) nop.b 0x0
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br.ctop.sptk .L_bn_sub_words_ctop };;
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.L_bn_sub_words_cend:
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{ .mii;
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(p59) add r8=1,r8 // return value
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mov pr=r9,0x1ffff
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mov ar.lc=r3 }
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{ .mbb; nop.b 0x0
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br.ret.sptk.many b0 };;
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.endp bn_sub_words#
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#endif
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#if 0
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#define XMA_TEMPTATION
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#endif
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#if 1
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//
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// BN_ULONG bn_mul_words(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w)
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//
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.global bn_mul_words#
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.proc bn_mul_words#
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.align 64
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.skip 32 // makes the loop body aligned at 64-byte boundary
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bn_mul_words:
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.prologue
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.fframe 0
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.save ar.pfs,r2
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#ifdef XMA_TEMPTATION
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{ .mfi; alloc r2=ar.pfs,4,0,0,0 };;
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#else
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{ .mfi; alloc r2=ar.pfs,4,4,0,8 };;
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#endif
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{ .mib; mov r8=r0 // return value
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cmp4.le p6,p0=r34,r0
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(p6) br.ret.spnt.many b0 };;
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.save ar.lc,r3
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{ .mii; sub r10=r34,r0,1
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mov r3=ar.lc
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mov r9=pr };;
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.body
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{ .mib; setf.sig f8=r35 // w
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mov pr.rot=0x400001<<16
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// ------^----- serves as (p48) at first (p26)
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brp.loop.imp .L_bn_mul_words_ctop,.L_bn_mul_words_cend-16
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}
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#ifndef XMA_TEMPTATION
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{ .mii;
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#if defined(_HPUX_SOURCE) && defined(_ILP32)
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addp4 r14=0,r32 // rp
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addp4 r15=0,r33 // ap
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#else
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mov r14=r32 // rp
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||
mov r15=r33 // ap
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||
#endif
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mov ar.lc=r10 }
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{ .mii; mov r39=0 // serves as r33 at first (p26)
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mov ar.ec=12 };;
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// This loop spins in 2*(n+11) ticks. It's scheduled for data in L2
|
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// cache (i.e. 9 ticks away) as floating point load/store instructions
|
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// bypass L1 cache and L2 latency is actually best-case scenario for
|
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// ldf8. The loop is not scalable and shall run in 2*(n+11) even on
|
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// "wider" IA-64 implementations. It's a trade-off here. n+22 loop
|
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// would give us ~5% in *overall* performance improvement on "wider"
|
||
// IA-64, but would hurt Itanium for about same because of longer
|
||
// epilogue. As it's a matter of few percents in either case I've
|
||
// chosen to trade the scalability for development time (you can see
|
||
// this very instruction sequence in bn_mul_add_words loop which in
|
||
// turn is scalable).
|
||
.L_bn_mul_words_ctop:
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||
{ .mfi; (p25) getf.sig r36=f49 // low
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||
(p21) xmpy.lu f45=f37,f8
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||
(p27) cmp.ltu p52,p48=r39,r38 }
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||
{ .mfi; (p16) ldf8 f32=[r15],8
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||
(p21) xmpy.hu f38=f37,f8
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||
(p0) nop.i 0x0 };;
|
||
{ .mii; (p26) getf.sig r32=f43 // high
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||
.pred.rel "mutex",p48,p52
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||
(p48) add r38=r37,r33 // (p26)
|
||
(p52) add r38=r37,r33,1 } // (p26)
|
||
{ .mfb; (p27) st8 [r14]=r39,8
|
||
(p0) nop.f 0x0
|
||
br.ctop.sptk .L_bn_mul_words_ctop };;
|
||
.L_bn_mul_words_cend:
|
||
|
||
{ .mii; nop.m 0x0
|
||
.pred.rel "mutex",p49,p53
|
||
(p49) add r8=r34,r0
|
||
(p53) add r8=r34,r0,1 }
|
||
{ .mfb; nop.m 0x0
|
||
nop.f 0x0
|
||
nop.b 0x0 }
|
||
|
||
#else // XMA_TEMPTATION
|
||
|
||
setf.sig f37=r0 // serves as carry at (p18) tick
|
||
mov ar.lc=r10
|
||
mov ar.ec=5;;
|
||
|
||
// Most of you examining this code very likely wonder why in the name
|
||
// of Intel the following loop is commented out? Indeed, it looks so
|
||
// neat that you find it hard to believe that it's something wrong
|
||
// with it, right? The catch is that every iteration depends on the
|
||
// result from previous one and the latter isn't available instantly.
|
||
// The loop therefore spins at the latency of xma minus 1, or in other
|
||
// words at 6*(n+4) ticks:-( Compare to the "production" loop above
|
||
// that runs in 2*(n+11) where the low latency problem is worked around
|
||
// by moving the dependency to one-tick latent interger ALU. Note that
|
||
// "distance" between ldf8 and xma is not latency of ldf8, but the
|
||
// *difference* between xma and ldf8 latencies.
|
||
.L_bn_mul_words_ctop:
|
||
{ .mfi; (p16) ldf8 f32=[r33],8
|
||
(p18) xma.hu f38=f34,f8,f39 }
|
||
{ .mfb; (p20) stf8 [r32]=f37,8
|
||
(p18) xma.lu f35=f34,f8,f39
|
||
br.ctop.sptk .L_bn_mul_words_ctop };;
|
||
.L_bn_mul_words_cend:
|
||
|
||
getf.sig r8=f41 // the return value
|
||
|
||
#endif // XMA_TEMPTATION
|
||
|
||
{ .mii; nop.m 0x0
|
||
mov pr=r9,0x1ffff
|
||
mov ar.lc=r3 }
|
||
{ .mfb; rum 1<<5 // clear um.mfh
|
||
nop.f 0x0
|
||
br.ret.sptk.many b0 };;
|
||
.endp bn_mul_words#
|
||
#endif
|
||
|
||
#if 1
|
||
//
|
||
// BN_ULONG bn_mul_add_words(BN_ULONG *rp, BN_ULONG *ap, int num, BN_ULONG w)
|
||
//
|
||
.global bn_mul_add_words#
|
||
.proc bn_mul_add_words#
|
||
.align 64
|
||
//.skip 0 // makes the loop split at 64-byte boundary
|
||
bn_mul_add_words:
|
||
.prologue
|
||
.fframe 0
|
||
.save ar.pfs,r2
|
||
{ .mii; alloc r2=ar.pfs,4,12,0,16
|
||
cmp4.le p6,p0=r34,r0 };;
|
||
{ .mfb; mov r8=r0 // return value
|
||
(p6) br.ret.spnt.many b0 };;
|
||
|
||
.save ar.lc,r3
|
||
{ .mii; sub r10=r34,r0,1
|
||
mov r3=ar.lc
|
||
mov r9=pr };;
|
||
|
||
.body
|
||
{ .mib; setf.sig f8=r35 // w
|
||
mov pr.rot=0x400001<<16
|
||
// ------^----- serves as (p48) at first (p26)
|
||
brp.loop.imp .L_bn_mul_add_words_ctop,.L_bn_mul_add_words_cend-16
|
||
}
|
||
{ .mii;
|
||
#if defined(_HPUX_SOURCE) && defined(_ILP32)
|
||
addp4 r14=0,r32 // rp
|
||
addp4 r15=0,r33 // ap
|
||
#else
|
||
mov r14=r32 // rp
|
||
mov r15=r33 // ap
|
||
#endif
|
||
mov ar.lc=r10 }
|
||
{ .mii; mov r39=0 // serves as r33 at first (p26)
|
||
#if defined(_HPUX_SOURCE) && defined(_ILP32)
|
||
addp4 r18=0,r32 // rp copy
|
||
#else
|
||
mov r18=r32 // rp copy
|
||
#endif
|
||
mov ar.ec=14 };;
|
||
|
||
// This loop spins in 3*(n+13) ticks on Itanium and should spin in
|
||
// 2*(n+13) on "wider" IA-64 implementations (to be verified with new
|
||
// <EFBFBD>-architecture manuals as they become available). As usual it's
|
||
// possible to compress the epilogue, down to 10 in this case, at the
|
||
// cost of scalability. Compressed (and therefore non-scalable) loop
|
||
// running at 3*(n+10) would buy you ~10% on Itanium but take ~35%
|
||
// from "wider" IA-64 so let it be scalable! Special attention was
|
||
// paid for having the loop body split at 64-byte boundary. ld8 is
|
||
// scheduled for L1 cache as the data is more than likely there.
|
||
// Indeed, bn_mul_words has put it there a moment ago:-)
|
||
.L_bn_mul_add_words_ctop:
|
||
{ .mfi; (p25) getf.sig r36=f49 // low
|
||
(p21) xmpy.lu f45=f37,f8
|
||
(p27) cmp.ltu p52,p48=r39,r38 }
|
||
{ .mfi; (p16) ldf8 f32=[r15],8
|
||
(p21) xmpy.hu f38=f37,f8
|
||
(p27) add r43=r43,r39 };;
|
||
{ .mii; (p26) getf.sig r32=f43 // high
|
||
.pred.rel "mutex",p48,p52
|
||
(p48) add r38=r37,r33 // (p26)
|
||
(p52) add r38=r37,r33,1 } // (p26)
|
||
{ .mfb; (p27) cmp.ltu.unc p56,p0=r43,r39
|
||
(p0) nop.f 0x0
|
||
(p0) nop.b 0x0 }
|
||
{ .mii; (p26) ld8 r42=[r18],8
|
||
(p58) cmp.eq.or p57,p0=-1,r44
|
||
(p58) add r44=1,r44 }
|
||
{ .mfb; (p29) st8 [r14]=r45,8
|
||
(p0) nop.f 0x0
|
||
br.ctop.sptk .L_bn_mul_add_words_ctop};;
|
||
.L_bn_mul_add_words_cend:
|
||
|
||
{ .mii; nop.m 0x0
|
||
.pred.rel "mutex",p51,p55
|
||
(p51) add r8=r36,r0
|
||
(p55) add r8=r36,r0,1 }
|
||
{ .mfb; nop.m 0x0
|
||
nop.f 0x0
|
||
nop.b 0x0 };;
|
||
{ .mii;
|
||
(p59) add r8=1,r8
|
||
mov pr=r9,0x1ffff
|
||
mov ar.lc=r3 }
|
||
{ .mfb; rum 1<<5 // clear um.mfh
|
||
nop.f 0x0
|
||
br.ret.sptk.many b0 };;
|
||
.endp bn_mul_add_words#
|
||
#endif
|
||
|
||
#if 1
|
||
//
|
||
// void bn_sqr_words(BN_ULONG *rp, BN_ULONG *ap, int num)
|
||
//
|
||
.global bn_sqr_words#
|
||
.proc bn_sqr_words#
|
||
.align 64
|
||
.skip 32 // makes the loop body aligned at 64-byte boundary
|
||
bn_sqr_words:
|
||
.prologue
|
||
.fframe 0
|
||
.save ar.pfs,r2
|
||
{ .mii; alloc r2=ar.pfs,3,0,0,0
|
||
sxt4 r34=r34 };;
|
||
{ .mii; cmp.le p6,p0=r34,r0
|
||
mov r8=r0 } // return value
|
||
{ .mfb; nop.f 0x0
|
||
(p6) br.ret.spnt.many b0 };;
|
||
|
||
.save ar.lc,r3
|
||
{ .mii; sub r10=r34,r0,1
|
||
mov r3=ar.lc
|
||
mov r9=pr };;
|
||
|
||
.body
|
||
#if defined(_HPUX_SOURCE) && defined(_ILP32)
|
||
{ .mii; addp4 r32=0,r32
|
||
addp4 r33=0,r33 };;
|
||
#endif
|
||
{ .mib;
|
||
mov pr.rot=1<<16
|
||
brp.loop.imp .L_bn_sqr_words_ctop,.L_bn_sqr_words_cend-16
|
||
}
|
||
{ .mii; add r34=8,r32
|
||
mov ar.lc=r10
|
||
mov ar.ec=18 };;
|
||
|
||
// 2*(n+17) on Itanium, (n+17) on "wider" IA-64 implementations. It's
|
||
// possible to compress the epilogue (I'm getting tired to write this
|
||
// comment over and over) and get down to 2*n+16 at the cost of
|
||
// scalability. The decision will very likely be reconsidered after the
|
||
// benchmark program is profiled. I.e. if perfomance gain on Itanium
|
||
// will appear larger than loss on "wider" IA-64, then the loop should
|
||
// be explicitely split and the epilogue compressed.
|
||
.L_bn_sqr_words_ctop:
|
||
{ .mfi; (p16) ldf8 f32=[r33],8
|
||
(p25) xmpy.lu f42=f41,f41
|
||
(p0) nop.i 0x0 }
|
||
{ .mib; (p33) stf8 [r32]=f50,16
|
||
(p0) nop.i 0x0
|
||
(p0) nop.b 0x0 }
|
||
{ .mfi; (p0) nop.m 0x0
|
||
(p25) xmpy.hu f52=f41,f41
|
||
(p0) nop.i 0x0 }
|
||
{ .mib; (p33) stf8 [r34]=f60,16
|
||
(p0) nop.i 0x0
|
||
br.ctop.sptk .L_bn_sqr_words_ctop };;
|
||
.L_bn_sqr_words_cend:
|
||
|
||
{ .mii; nop.m 0x0
|
||
mov pr=r9,0x1ffff
|
||
mov ar.lc=r3 }
|
||
{ .mfb; rum 1<<5 // clear um.mfh
|
||
nop.f 0x0
|
||
br.ret.sptk.many b0 };;
|
||
.endp bn_sqr_words#
|
||
#endif
|
||
|
||
#if 1
|
||
// Apparently we win nothing by implementing special bn_sqr_comba8.
|
||
// Yes, it is possible to reduce the number of multiplications by
|
||
// almost factor of two, but then the amount of additions would
|
||
// increase by factor of two (as we would have to perform those
|
||
// otherwise performed by xma ourselves). Normally we would trade
|
||
// anyway as multiplications are way more expensive, but not this
|
||
// time... Multiplication kernel is fully pipelined and as we drain
|
||
// one 128-bit multiplication result per clock cycle multiplications
|
||
// are effectively as inexpensive as additions. Special implementation
|
||
// might become of interest for "wider" IA-64 implementation as you'll
|
||
// be able to get through the multiplication phase faster (there won't
|
||
// be any stall issues as discussed in the commentary section below and
|
||
// you therefore will be able to employ all 4 FP units)... But these
|
||
// Itanium days it's simply too hard to justify the effort so I just
|
||
// drop down to bn_mul_comba8 code:-)
|
||
//
|
||
// void bn_sqr_comba8(BN_ULONG *r, BN_ULONG *a)
|
||
//
|
||
.global bn_sqr_comba8#
|
||
.proc bn_sqr_comba8#
|
||
.align 64
|
||
bn_sqr_comba8:
|
||
.prologue
|
||
.fframe 0
|
||
.save ar.pfs,r2
|
||
#if defined(_HPUX_SOURCE) && defined(_ILP32)
|
||
{ .mii; alloc r2=ar.pfs,2,1,0,0
|
||
addp4 r33=0,r33
|
||
addp4 r32=0,r32 };;
|
||
{ .mii;
|
||
#else
|
||
{ .mii; alloc r2=ar.pfs,2,1,0,0
|
||
#endif
|
||
mov r34=r33
|
||
add r14=8,r33 };;
|
||
.body
|
||
{ .mii; add r17=8,r34
|
||
add r15=16,r33
|
||
add r18=16,r34 }
|
||
{ .mfb; add r16=24,r33
|
||
br .L_cheat_entry_point8 };;
|
||
.endp bn_sqr_comba8#
|
||
#endif
|
||
|
||
#if 1
|
||
// I've estimated this routine to run in ~120 ticks, but in reality
|
||
// (i.e. according to ar.itc) it takes ~160 ticks. Are those extra
|
||
// cycles consumed for instructions fetch? Or did I misinterpret some
|
||
// clause in Itanium <EFBFBD>-architecture manual? Comments are welcomed and
|
||
// highly appreciated.
|
||
//
|
||
// However! It should be noted that even 160 ticks is darn good result
|
||
// as it's over 10 (yes, ten, spelled as t-e-n) times faster than the
|
||
// C version (compiled with gcc with inline assembler). I really
|
||
// kicked compiler's butt here, didn't I? Yeah! This brings us to the
|
||
// following statement. It's damn shame that this routine isn't called
|
||
// very often nowadays! According to the profiler most CPU time is
|
||
// consumed by bn_mul_add_words called from BN_from_montgomery. In
|
||
// order to estimate what we're missing, I've compared the performance
|
||
// of this routine against "traditional" implementation, i.e. against
|
||
// following routine:
|
||
//
|
||
// void bn_mul_comba8(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b)
|
||
// { r[ 8]=bn_mul_words( &(r[0]),a,8,b[0]);
|
||
// r[ 9]=bn_mul_add_words(&(r[1]),a,8,b[1]);
|
||
// r[10]=bn_mul_add_words(&(r[2]),a,8,b[2]);
|
||
// r[11]=bn_mul_add_words(&(r[3]),a,8,b[3]);
|
||
// r[12]=bn_mul_add_words(&(r[4]),a,8,b[4]);
|
||
// r[13]=bn_mul_add_words(&(r[5]),a,8,b[5]);
|
||
// r[14]=bn_mul_add_words(&(r[6]),a,8,b[6]);
|
||
// r[15]=bn_mul_add_words(&(r[7]),a,8,b[7]);
|
||
// }
|
||
//
|
||
// The one below is over 8 times faster than the one above:-( Even
|
||
// more reasons to "combafy" bn_mul_add_mont...
|
||
//
|
||
// And yes, this routine really made me wish there were an optimizing
|
||
// assembler! It also feels like it deserves a dedication.
|
||
//
|
||
// To my wife for being there and to my kids...
|
||
//
|
||
// void bn_mul_comba8(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b)
|
||
//
|
||
#define carry1 r14
|
||
#define carry2 r15
|
||
#define carry3 r34
|
||
.global bn_mul_comba8#
|
||
.proc bn_mul_comba8#
|
||
.align 64
|
||
bn_mul_comba8:
|
||
.prologue
|
||
.fframe 0
|
||
.save ar.pfs,r2
|
||
#if defined(_HPUX_SOURCE) && defined(_ILP32)
|
||
{ .mii; alloc r2=ar.pfs,3,0,0,0
|
||
addp4 r33=0,r33
|
||
addp4 r34=0,r34 };;
|
||
{ .mii; addp4 r32=0,r32
|
||
#else
|
||
{ .mii; alloc r2=ar.pfs,3,0,0,0
|
||
#endif
|
||
add r14=8,r33
|
||
add r17=8,r34 }
|
||
.body
|
||
{ .mii; add r15=16,r33
|
||
add r18=16,r34
|
||
add r16=24,r33 }
|
||
.L_cheat_entry_point8:
|
||
{ .mmi; add r19=24,r34
|
||
|
||
ldf8 f32=[r33],32 };;
|
||
|
||
{ .mmi; ldf8 f120=[r34],32
|
||
ldf8 f121=[r17],32 }
|
||
{ .mmi; ldf8 f122=[r18],32
|
||
ldf8 f123=[r19],32 };;
|
||
{ .mmi; ldf8 f124=[r34]
|
||
ldf8 f125=[r17] }
|
||
{ .mmi; ldf8 f126=[r18]
|
||
ldf8 f127=[r19] }
|
||
|
||
{ .mmi; ldf8 f33=[r14],32
|
||
ldf8 f34=[r15],32 }
|
||
{ .mmi; ldf8 f35=[r16],32;;
|
||
ldf8 f36=[r33] }
|
||
{ .mmi; ldf8 f37=[r14]
|
||
ldf8 f38=[r15] }
|
||
{ .mfi; ldf8 f39=[r16]
|
||
// -------\ Entering multiplier's heaven /-------
|
||
// ------------\ /------------
|
||
// -----------------\ /-----------------
|
||
// ----------------------\/----------------------
|
||
xma.hu f41=f32,f120,f0 }
|
||
{ .mfi; xma.lu f40=f32,f120,f0 };; // (*)
|
||
{ .mfi; xma.hu f51=f32,f121,f0 }
|
||
{ .mfi; xma.lu f50=f32,f121,f0 };;
|
||
{ .mfi; xma.hu f61=f32,f122,f0 }
|
||
{ .mfi; xma.lu f60=f32,f122,f0 };;
|
||
{ .mfi; xma.hu f71=f32,f123,f0 }
|
||
{ .mfi; xma.lu f70=f32,f123,f0 };;
|
||
{ .mfi; xma.hu f81=f32,f124,f0 }
|
||
{ .mfi; xma.lu f80=f32,f124,f0 };;
|
||
{ .mfi; xma.hu f91=f32,f125,f0 }
|
||
{ .mfi; xma.lu f90=f32,f125,f0 };;
|
||
{ .mfi; xma.hu f101=f32,f126,f0 }
|
||
{ .mfi; xma.lu f100=f32,f126,f0 };;
|
||
{ .mfi; xma.hu f111=f32,f127,f0 }
|
||
{ .mfi; xma.lu f110=f32,f127,f0 };;//
|
||
// (*) You can argue that splitting at every second bundle would
|
||
// prevent "wider" IA-64 implementations from achieving the peak
|
||
// performance. Well, not really... The catch is that if you
|
||
// intend to keep 4 FP units busy by splitting at every fourth
|
||
// bundle and thus perform these 16 multiplications in 4 ticks,
|
||
// the first bundle *below* would stall because the result from
|
||
// the first xma bundle *above* won't be available for another 3
|
||
// ticks (if not more, being an optimist, I assume that "wider"
|
||
// implementation will have same latency:-). This stall will hold
|
||
// you back and the performance would be as if every second bundle
|
||
// were split *anyway*...
|
||
{ .mfi; getf.sig r16=f40
|
||
xma.hu f42=f33,f120,f41
|
||
add r33=8,r32 }
|
||
{ .mfi; xma.lu f41=f33,f120,f41 };;
|
||
{ .mfi; getf.sig r24=f50
|
||
xma.hu f52=f33,f121,f51 }
|
||
{ .mfi; xma.lu f51=f33,f121,f51 };;
|
||
{ .mfi; st8 [r32]=r16,16
|
||
xma.hu f62=f33,f122,f61 }
|
||
{ .mfi; xma.lu f61=f33,f122,f61 };;
|
||
{ .mfi; xma.hu f72=f33,f123,f71 }
|
||
{ .mfi; xma.lu f71=f33,f123,f71 };;
|
||
{ .mfi; xma.hu f82=f33,f124,f81 }
|
||
{ .mfi; xma.lu f81=f33,f124,f81 };;
|
||
{ .mfi; xma.hu f92=f33,f125,f91 }
|
||
{ .mfi; xma.lu f91=f33,f125,f91 };;
|
||
{ .mfi; xma.hu f102=f33,f126,f101 }
|
||
{ .mfi; xma.lu f101=f33,f126,f101 };;
|
||
{ .mfi; xma.hu f112=f33,f127,f111 }
|
||
{ .mfi; xma.lu f111=f33,f127,f111 };;//
|
||
//-------------------------------------------------//
|
||
{ .mfi; getf.sig r25=f41
|
||
xma.hu f43=f34,f120,f42 }
|
||
{ .mfi; xma.lu f42=f34,f120,f42 };;
|
||
{ .mfi; getf.sig r16=f60
|
||
xma.hu f53=f34,f121,f52 }
|
||
{ .mfi; xma.lu f52=f34,f121,f52 };;
|
||
{ .mfi; getf.sig r17=f51
|
||
xma.hu f63=f34,f122,f62
|
||
add r25=r25,r24 }
|
||
{ .mfi; xma.lu f62=f34,f122,f62
|
||
mov carry1=0 };;
|
||
{ .mfi; cmp.ltu p6,p0=r25,r24
|
||
xma.hu f73=f34,f123,f72 }
|
||
{ .mfi; xma.lu f72=f34,f123,f72 };;
|
||
{ .mfi; st8 [r33]=r25,16
|
||
xma.hu f83=f34,f124,f82
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; xma.lu f82=f34,f124,f82 };;
|
||
{ .mfi; xma.hu f93=f34,f125,f92 }
|
||
{ .mfi; xma.lu f92=f34,f125,f92 };;
|
||
{ .mfi; xma.hu f103=f34,f126,f102 }
|
||
{ .mfi; xma.lu f102=f34,f126,f102 };;
|
||
{ .mfi; xma.hu f113=f34,f127,f112 }
|
||
{ .mfi; xma.lu f112=f34,f127,f112 };;//
|
||
//-------------------------------------------------//
|
||
{ .mfi; getf.sig r18=f42
|
||
xma.hu f44=f35,f120,f43
|
||
add r17=r17,r16 }
|
||
{ .mfi; xma.lu f43=f35,f120,f43 };;
|
||
{ .mfi; getf.sig r24=f70
|
||
xma.hu f54=f35,f121,f53 }
|
||
{ .mfi; mov carry2=0
|
||
xma.lu f53=f35,f121,f53 };;
|
||
{ .mfi; getf.sig r25=f61
|
||
xma.hu f64=f35,f122,f63
|
||
cmp.ltu p7,p0=r17,r16 }
|
||
{ .mfi; add r18=r18,r17
|
||
xma.lu f63=f35,f122,f63 };;
|
||
{ .mfi; getf.sig r26=f52
|
||
xma.hu f74=f35,f123,f73
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; cmp.ltu p7,p0=r18,r17
|
||
xma.lu f73=f35,f123,f73
|
||
add r18=r18,carry1 };;
|
||
{ .mfi;
|
||
xma.hu f84=f35,f124,f83
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; cmp.ltu p7,p0=r18,carry1
|
||
xma.lu f83=f35,f124,f83 };;
|
||
{ .mfi; st8 [r32]=r18,16
|
||
xma.hu f94=f35,f125,f93
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; xma.lu f93=f35,f125,f93 };;
|
||
{ .mfi; xma.hu f104=f35,f126,f103 }
|
||
{ .mfi; xma.lu f103=f35,f126,f103 };;
|
||
{ .mfi; xma.hu f114=f35,f127,f113 }
|
||
{ .mfi; mov carry1=0
|
||
xma.lu f113=f35,f127,f113
|
||
add r25=r25,r24 };;//
|
||
//-------------------------------------------------//
|
||
{ .mfi; getf.sig r27=f43
|
||
xma.hu f45=f36,f120,f44
|
||
cmp.ltu p6,p0=r25,r24 }
|
||
{ .mfi; xma.lu f44=f36,f120,f44
|
||
add r26=r26,r25 };;
|
||
{ .mfi; getf.sig r16=f80
|
||
xma.hu f55=f36,f121,f54
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; xma.lu f54=f36,f121,f54 };;
|
||
{ .mfi; getf.sig r17=f71
|
||
xma.hu f65=f36,f122,f64
|
||
cmp.ltu p6,p0=r26,r25 }
|
||
{ .mfi; xma.lu f64=f36,f122,f64
|
||
add r27=r27,r26 };;
|
||
{ .mfi; getf.sig r18=f62
|
||
xma.hu f75=f36,f123,f74
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; cmp.ltu p6,p0=r27,r26
|
||
xma.lu f74=f36,f123,f74
|
||
add r27=r27,carry2 };;
|
||
{ .mfi; getf.sig r19=f53
|
||
xma.hu f85=f36,f124,f84
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; xma.lu f84=f36,f124,f84
|
||
cmp.ltu p6,p0=r27,carry2 };;
|
||
{ .mfi; st8 [r33]=r27,16
|
||
xma.hu f95=f36,f125,f94
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; xma.lu f94=f36,f125,f94 };;
|
||
{ .mfi; xma.hu f105=f36,f126,f104 }
|
||
{ .mfi; mov carry2=0
|
||
xma.lu f104=f36,f126,f104
|
||
add r17=r17,r16 };;
|
||
{ .mfi; xma.hu f115=f36,f127,f114
|
||
cmp.ltu p7,p0=r17,r16 }
|
||
{ .mfi; xma.lu f114=f36,f127,f114
|
||
add r18=r18,r17 };;//
|
||
//-------------------------------------------------//
|
||
{ .mfi; getf.sig r20=f44
|
||
xma.hu f46=f37,f120,f45
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; cmp.ltu p7,p0=r18,r17
|
||
xma.lu f45=f37,f120,f45
|
||
add r19=r19,r18 };;
|
||
{ .mfi; getf.sig r24=f90
|
||
xma.hu f56=f37,f121,f55 }
|
||
{ .mfi; xma.lu f55=f37,f121,f55 };;
|
||
{ .mfi; getf.sig r25=f81
|
||
xma.hu f66=f37,f122,f65
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; cmp.ltu p7,p0=r19,r18
|
||
xma.lu f65=f37,f122,f65
|
||
add r20=r20,r19 };;
|
||
{ .mfi; getf.sig r26=f72
|
||
xma.hu f76=f37,f123,f75
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; cmp.ltu p7,p0=r20,r19
|
||
xma.lu f75=f37,f123,f75
|
||
add r20=r20,carry1 };;
|
||
{ .mfi; getf.sig r27=f63
|
||
xma.hu f86=f37,f124,f85
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; xma.lu f85=f37,f124,f85
|
||
cmp.ltu p7,p0=r20,carry1 };;
|
||
{ .mfi; getf.sig r28=f54
|
||
xma.hu f96=f37,f125,f95
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; st8 [r32]=r20,16
|
||
xma.lu f95=f37,f125,f95 };;
|
||
{ .mfi; xma.hu f106=f37,f126,f105 }
|
||
{ .mfi; mov carry1=0
|
||
xma.lu f105=f37,f126,f105
|
||
add r25=r25,r24 };;
|
||
{ .mfi; xma.hu f116=f37,f127,f115
|
||
cmp.ltu p6,p0=r25,r24 }
|
||
{ .mfi; xma.lu f115=f37,f127,f115
|
||
add r26=r26,r25 };;//
|
||
//-------------------------------------------------//
|
||
{ .mfi; getf.sig r29=f45
|
||
xma.hu f47=f38,f120,f46
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; cmp.ltu p6,p0=r26,r25
|
||
xma.lu f46=f38,f120,f46
|
||
add r27=r27,r26 };;
|
||
{ .mfi; getf.sig r16=f100
|
||
xma.hu f57=f38,f121,f56
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; cmp.ltu p6,p0=r27,r26
|
||
xma.lu f56=f38,f121,f56
|
||
add r28=r28,r27 };;
|
||
{ .mfi; getf.sig r17=f91
|
||
xma.hu f67=f38,f122,f66
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; cmp.ltu p6,p0=r28,r27
|
||
xma.lu f66=f38,f122,f66
|
||
add r29=r29,r28 };;
|
||
{ .mfi; getf.sig r18=f82
|
||
xma.hu f77=f38,f123,f76
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; cmp.ltu p6,p0=r29,r28
|
||
xma.lu f76=f38,f123,f76
|
||
add r29=r29,carry2 };;
|
||
{ .mfi; getf.sig r19=f73
|
||
xma.hu f87=f38,f124,f86
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; xma.lu f86=f38,f124,f86
|
||
cmp.ltu p6,p0=r29,carry2 };;
|
||
{ .mfi; getf.sig r20=f64
|
||
xma.hu f97=f38,f125,f96
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; st8 [r33]=r29,16
|
||
xma.lu f96=f38,f125,f96 };;
|
||
{ .mfi; getf.sig r21=f55
|
||
xma.hu f107=f38,f126,f106 }
|
||
{ .mfi; mov carry2=0
|
||
xma.lu f106=f38,f126,f106
|
||
add r17=r17,r16 };;
|
||
{ .mfi; xma.hu f117=f38,f127,f116
|
||
cmp.ltu p7,p0=r17,r16 }
|
||
{ .mfi; xma.lu f116=f38,f127,f116
|
||
add r18=r18,r17 };;//
|
||
//-------------------------------------------------//
|
||
{ .mfi; getf.sig r22=f46
|
||
xma.hu f48=f39,f120,f47
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; cmp.ltu p7,p0=r18,r17
|
||
xma.lu f47=f39,f120,f47
|
||
add r19=r19,r18 };;
|
||
{ .mfi; getf.sig r24=f110
|
||
xma.hu f58=f39,f121,f57
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; cmp.ltu p7,p0=r19,r18
|
||
xma.lu f57=f39,f121,f57
|
||
add r20=r20,r19 };;
|
||
{ .mfi; getf.sig r25=f101
|
||
xma.hu f68=f39,f122,f67
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; cmp.ltu p7,p0=r20,r19
|
||
xma.lu f67=f39,f122,f67
|
||
add r21=r21,r20 };;
|
||
{ .mfi; getf.sig r26=f92
|
||
xma.hu f78=f39,f123,f77
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; cmp.ltu p7,p0=r21,r20
|
||
xma.lu f77=f39,f123,f77
|
||
add r22=r22,r21 };;
|
||
{ .mfi; getf.sig r27=f83
|
||
xma.hu f88=f39,f124,f87
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; cmp.ltu p7,p0=r22,r21
|
||
xma.lu f87=f39,f124,f87
|
||
add r22=r22,carry1 };;
|
||
{ .mfi; getf.sig r28=f74
|
||
xma.hu f98=f39,f125,f97
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; xma.lu f97=f39,f125,f97
|
||
cmp.ltu p7,p0=r22,carry1 };;
|
||
{ .mfi; getf.sig r29=f65
|
||
xma.hu f108=f39,f126,f107
|
||
(p7) add carry2=1,carry2 }
|
||
{ .mfi; st8 [r32]=r22,16
|
||
xma.lu f107=f39,f126,f107 };;
|
||
{ .mfi; getf.sig r30=f56
|
||
xma.hu f118=f39,f127,f117 }
|
||
{ .mfi; xma.lu f117=f39,f127,f117 };;//
|
||
//-------------------------------------------------//
|
||
// Leaving muliplier's heaven... Quite a ride, huh?
|
||
|
||
{ .mii; getf.sig r31=f47
|
||
add r25=r25,r24
|
||
mov carry1=0 };;
|
||
{ .mii; getf.sig r16=f111
|
||
cmp.ltu p6,p0=r25,r24
|
||
add r26=r26,r25 };;
|
||
{ .mfb; getf.sig r17=f102 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r26,r25
|
||
add r27=r27,r26 };;
|
||
{ .mfb; nop.m 0x0 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r27,r26
|
||
add r28=r28,r27 };;
|
||
{ .mii; getf.sig r18=f93
|
||
add r17=r17,r16
|
||
mov carry3=0 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r28,r27
|
||
add r29=r29,r28 };;
|
||
{ .mii; getf.sig r19=f84
|
||
cmp.ltu p7,p0=r17,r16 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r29,r28
|
||
add r30=r30,r29 };;
|
||
{ .mii; getf.sig r20=f75
|
||
add r18=r18,r17 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r30,r29
|
||
add r31=r31,r30 };;
|
||
{ .mfb; getf.sig r21=f66 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p0=r18,r17
|
||
add r19=r19,r18 }
|
||
{ .mfb; nop.m 0x0 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r31,r30
|
||
add r31=r31,carry2 };;
|
||
{ .mfb; getf.sig r22=f57 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p0=r19,r18
|
||
add r20=r20,r19 }
|
||
{ .mfb; nop.m 0x0 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r31,carry2 };;
|
||
{ .mfb; getf.sig r23=f48 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p0=r20,r19
|
||
add r21=r21,r20 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfb; st8 [r33]=r31,16 };;
|
||
|
||
{ .mfb; getf.sig r24=f112 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p0=r21,r20
|
||
add r22=r22,r21 };;
|
||
{ .mfb; getf.sig r25=f103 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p0=r22,r21
|
||
add r23=r23,r22 };;
|
||
{ .mfb; getf.sig r26=f94 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p0=r23,r22
|
||
add r23=r23,carry1 };;
|
||
{ .mfb; getf.sig r27=f85 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p8=r23,carry1};;
|
||
{ .mii; getf.sig r28=f76
|
||
add r25=r25,r24
|
||
mov carry1=0 }
|
||
{ .mii; st8 [r32]=r23,16
|
||
(p7) add carry2=1,carry3
|
||
(p8) add carry2=0,carry3 };;
|
||
|
||
{ .mfb; nop.m 0x0 }
|
||
{ .mii; getf.sig r29=f67
|
||
cmp.ltu p6,p0=r25,r24
|
||
add r26=r26,r25 };;
|
||
{ .mfb; getf.sig r30=f58 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r26,r25
|
||
add r27=r27,r26 };;
|
||
{ .mfb; getf.sig r16=f113 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r27,r26
|
||
add r28=r28,r27 };;
|
||
{ .mfb; getf.sig r17=f104 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r28,r27
|
||
add r29=r29,r28 };;
|
||
{ .mfb; getf.sig r18=f95 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r29,r28
|
||
add r30=r30,r29 };;
|
||
{ .mii; getf.sig r19=f86
|
||
add r17=r17,r16
|
||
mov carry3=0 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r30,r29
|
||
add r30=r30,carry2 };;
|
||
{ .mii; getf.sig r20=f77
|
||
cmp.ltu p7,p0=r17,r16
|
||
add r18=r18,r17 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r30,carry2 };;
|
||
{ .mfb; getf.sig r21=f68 }
|
||
{ .mii; st8 [r33]=r30,16
|
||
(p6) add carry1=1,carry1 };;
|
||
|
||
{ .mfb; getf.sig r24=f114 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p0=r18,r17
|
||
add r19=r19,r18 };;
|
||
{ .mfb; getf.sig r25=f105 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p0=r19,r18
|
||
add r20=r20,r19 };;
|
||
{ .mfb; getf.sig r26=f96 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p0=r20,r19
|
||
add r21=r21,r20 };;
|
||
{ .mfb; getf.sig r27=f87 }
|
||
{ .mii; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p0=r21,r20
|
||
add r21=r21,carry1 };;
|
||
{ .mib; getf.sig r28=f78
|
||
add r25=r25,r24 }
|
||
{ .mib; (p7) add carry3=1,carry3
|
||
cmp.ltu p7,p8=r21,carry1};;
|
||
{ .mii; st8 [r32]=r21,16
|
||
(p7) add carry2=1,carry3
|
||
(p8) add carry2=0,carry3 }
|
||
|
||
{ .mii; mov carry1=0
|
||
cmp.ltu p6,p0=r25,r24
|
||
add r26=r26,r25 };;
|
||
{ .mfb; getf.sig r16=f115 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r26,r25
|
||
add r27=r27,r26 };;
|
||
{ .mfb; getf.sig r17=f106 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r27,r26
|
||
add r28=r28,r27 };;
|
||
{ .mfb; getf.sig r18=f97 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r28,r27
|
||
add r28=r28,carry2 };;
|
||
{ .mib; getf.sig r19=f88
|
||
add r17=r17,r16 }
|
||
{ .mib;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r28,carry2 };;
|
||
{ .mii; st8 [r33]=r28,16
|
||
(p6) add carry1=1,carry1 }
|
||
|
||
{ .mii; mov carry2=0
|
||
cmp.ltu p7,p0=r17,r16
|
||
add r18=r18,r17 };;
|
||
{ .mfb; getf.sig r24=f116 }
|
||
{ .mii; (p7) add carry2=1,carry2
|
||
cmp.ltu p7,p0=r18,r17
|
||
add r19=r19,r18 };;
|
||
{ .mfb; getf.sig r25=f107 }
|
||
{ .mii; (p7) add carry2=1,carry2
|
||
cmp.ltu p7,p0=r19,r18
|
||
add r19=r19,carry1 };;
|
||
{ .mfb; getf.sig r26=f98 }
|
||
{ .mii; (p7) add carry2=1,carry2
|
||
cmp.ltu p7,p0=r19,carry1};;
|
||
{ .mii; st8 [r32]=r19,16
|
||
(p7) add carry2=1,carry2 }
|
||
|
||
{ .mfb; add r25=r25,r24 };;
|
||
|
||
{ .mfb; getf.sig r16=f117 }
|
||
{ .mii; mov carry1=0
|
||
cmp.ltu p6,p0=r25,r24
|
||
add r26=r26,r25 };;
|
||
{ .mfb; getf.sig r17=f108 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r26,r25
|
||
add r26=r26,carry2 };;
|
||
{ .mfb; nop.m 0x0 }
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r26,carry2 };;
|
||
{ .mii; st8 [r33]=r26,16
|
||
(p6) add carry1=1,carry1 }
|
||
|
||
{ .mfb; add r17=r17,r16 };;
|
||
{ .mfb; getf.sig r24=f118 }
|
||
{ .mii; mov carry2=0
|
||
cmp.ltu p7,p0=r17,r16
|
||
add r17=r17,carry1 };;
|
||
{ .mii; (p7) add carry2=1,carry2
|
||
cmp.ltu p7,p0=r17,carry1};;
|
||
{ .mii; st8 [r32]=r17
|
||
(p7) add carry2=1,carry2 };;
|
||
{ .mfb; add r24=r24,carry2 };;
|
||
{ .mib; st8 [r33]=r24 }
|
||
|
||
{ .mib; rum 1<<5 // clear um.mfh
|
||
br.ret.sptk.many b0 };;
|
||
.endp bn_mul_comba8#
|
||
#undef carry3
|
||
#undef carry2
|
||
#undef carry1
|
||
#endif
|
||
|
||
#if 1
|
||
// It's possible to make it faster (see comment to bn_sqr_comba8), but
|
||
// I reckon it doesn't worth the effort. Basically because the routine
|
||
// (actually both of them) practically never called... So I just play
|
||
// same trick as with bn_sqr_comba8.
|
||
//
|
||
// void bn_sqr_comba4(BN_ULONG *r, BN_ULONG *a)
|
||
//
|
||
.global bn_sqr_comba4#
|
||
.proc bn_sqr_comba4#
|
||
.align 64
|
||
bn_sqr_comba4:
|
||
.prologue
|
||
.fframe 0
|
||
.save ar.pfs,r2
|
||
#if defined(_HPUX_SOURCE) && defined(_ILP32)
|
||
{ .mii; alloc r2=ar.pfs,2,1,0,0
|
||
addp4 r32=0,r32
|
||
addp4 r33=0,r33 };;
|
||
{ .mii;
|
||
#else
|
||
{ .mii; alloc r2=ar.pfs,2,1,0,0
|
||
#endif
|
||
mov r34=r33
|
||
add r14=8,r33 };;
|
||
.body
|
||
{ .mii; add r17=8,r34
|
||
add r15=16,r33
|
||
add r18=16,r34 }
|
||
{ .mfb; add r16=24,r33
|
||
br .L_cheat_entry_point4 };;
|
||
.endp bn_sqr_comba4#
|
||
#endif
|
||
|
||
#if 1
|
||
// Runs in ~115 cycles and ~4.5 times faster than C. Well, whatever...
|
||
//
|
||
// void bn_mul_comba4(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b)
|
||
//
|
||
#define carry1 r14
|
||
#define carry2 r15
|
||
.global bn_mul_comba4#
|
||
.proc bn_mul_comba4#
|
||
.align 64
|
||
bn_mul_comba4:
|
||
.prologue
|
||
.fframe 0
|
||
.save ar.pfs,r2
|
||
#if defined(_HPUX_SOURCE) && defined(_ILP32)
|
||
{ .mii; alloc r2=ar.pfs,3,0,0,0
|
||
addp4 r33=0,r33
|
||
addp4 r34=0,r34 };;
|
||
{ .mii; addp4 r32=0,r32
|
||
#else
|
||
{ .mii; alloc r2=ar.pfs,3,0,0,0
|
||
#endif
|
||
add r14=8,r33
|
||
add r17=8,r34 }
|
||
.body
|
||
{ .mii; add r15=16,r33
|
||
add r18=16,r34
|
||
add r16=24,r33 };;
|
||
.L_cheat_entry_point4:
|
||
{ .mmi; add r19=24,r34
|
||
|
||
ldf8 f32=[r33] }
|
||
|
||
{ .mmi; ldf8 f120=[r34]
|
||
ldf8 f121=[r17] };;
|
||
{ .mmi; ldf8 f122=[r18]
|
||
ldf8 f123=[r19] }
|
||
|
||
{ .mmi; ldf8 f33=[r14]
|
||
ldf8 f34=[r15] }
|
||
{ .mfi; ldf8 f35=[r16]
|
||
|
||
xma.hu f41=f32,f120,f0 }
|
||
{ .mfi; xma.lu f40=f32,f120,f0 };;
|
||
{ .mfi; xma.hu f51=f32,f121,f0 }
|
||
{ .mfi; xma.lu f50=f32,f121,f0 };;
|
||
{ .mfi; xma.hu f61=f32,f122,f0 }
|
||
{ .mfi; xma.lu f60=f32,f122,f0 };;
|
||
{ .mfi; xma.hu f71=f32,f123,f0 }
|
||
{ .mfi; xma.lu f70=f32,f123,f0 };;//
|
||
// Major stall takes place here, and 3 more places below. Result from
|
||
// first xma is not available for another 3 ticks.
|
||
{ .mfi; getf.sig r16=f40
|
||
xma.hu f42=f33,f120,f41
|
||
add r33=8,r32 }
|
||
{ .mfi; xma.lu f41=f33,f120,f41 };;
|
||
{ .mfi; getf.sig r24=f50
|
||
xma.hu f52=f33,f121,f51 }
|
||
{ .mfi; xma.lu f51=f33,f121,f51 };;
|
||
{ .mfi; st8 [r32]=r16,16
|
||
xma.hu f62=f33,f122,f61 }
|
||
{ .mfi; xma.lu f61=f33,f122,f61 };;
|
||
{ .mfi; xma.hu f72=f33,f123,f71 }
|
||
{ .mfi; xma.lu f71=f33,f123,f71 };;//
|
||
//-------------------------------------------------//
|
||
{ .mfi; getf.sig r25=f41
|
||
xma.hu f43=f34,f120,f42 }
|
||
{ .mfi; xma.lu f42=f34,f120,f42 };;
|
||
{ .mfi; getf.sig r16=f60
|
||
xma.hu f53=f34,f121,f52 }
|
||
{ .mfi; xma.lu f52=f34,f121,f52 };;
|
||
{ .mfi; getf.sig r17=f51
|
||
xma.hu f63=f34,f122,f62
|
||
add r25=r25,r24 }
|
||
{ .mfi; mov carry1=0
|
||
xma.lu f62=f34,f122,f62 };;
|
||
{ .mfi; st8 [r33]=r25,16
|
||
xma.hu f73=f34,f123,f72
|
||
cmp.ltu p6,p0=r25,r24 }
|
||
{ .mfi; xma.lu f72=f34,f123,f72 };;//
|
||
//-------------------------------------------------//
|
||
{ .mfi; getf.sig r18=f42
|
||
xma.hu f44=f35,f120,f43
|
||
(p6) add carry1=1,carry1 }
|
||
{ .mfi; add r17=r17,r16
|
||
xma.lu f43=f35,f120,f43
|
||
mov carry2=0 };;
|
||
{ .mfi; getf.sig r24=f70
|
||
xma.hu f54=f35,f121,f53
|
||
cmp.ltu p7,p0=r17,r16 }
|
||
{ .mfi; xma.lu f53=f35,f121,f53 };;
|
||
{ .mfi; getf.sig r25=f61
|
||
xma.hu f64=f35,f122,f63
|
||
add r18=r18,r17 }
|
||
{ .mfi; xma.lu f63=f35,f122,f63
|
||
(p7) add carry2=1,carry2 };;
|
||
{ .mfi; getf.sig r26=f52
|
||
xma.hu f74=f35,f123,f73
|
||
cmp.ltu p7,p0=r18,r17 }
|
||
{ .mfi; xma.lu f73=f35,f123,f73
|
||
add r18=r18,carry1 };;
|
||
//-------------------------------------------------//
|
||
{ .mii; st8 [r32]=r18,16
|
||
(p7) add carry2=1,carry2
|
||
cmp.ltu p7,p0=r18,carry1 };;
|
||
|
||
{ .mfi; getf.sig r27=f43 // last major stall
|
||
(p7) add carry2=1,carry2 };;
|
||
{ .mii; getf.sig r16=f71
|
||
add r25=r25,r24
|
||
mov carry1=0 };;
|
||
{ .mii; getf.sig r17=f62
|
||
cmp.ltu p6,p0=r25,r24
|
||
add r26=r26,r25 };;
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r26,r25
|
||
add r27=r27,r26 };;
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r27,r26
|
||
add r27=r27,carry2 };;
|
||
{ .mii; getf.sig r18=f53
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r27,carry2 };;
|
||
{ .mfi; st8 [r33]=r27,16
|
||
(p6) add carry1=1,carry1 }
|
||
|
||
{ .mii; getf.sig r19=f44
|
||
add r17=r17,r16
|
||
mov carry2=0 };;
|
||
{ .mii; getf.sig r24=f72
|
||
cmp.ltu p7,p0=r17,r16
|
||
add r18=r18,r17 };;
|
||
{ .mii; (p7) add carry2=1,carry2
|
||
cmp.ltu p7,p0=r18,r17
|
||
add r19=r19,r18 };;
|
||
{ .mii; (p7) add carry2=1,carry2
|
||
cmp.ltu p7,p0=r19,r18
|
||
add r19=r19,carry1 };;
|
||
{ .mii; getf.sig r25=f63
|
||
(p7) add carry2=1,carry2
|
||
cmp.ltu p7,p0=r19,carry1};;
|
||
{ .mii; st8 [r32]=r19,16
|
||
(p7) add carry2=1,carry2 }
|
||
|
||
{ .mii; getf.sig r26=f54
|
||
add r25=r25,r24
|
||
mov carry1=0 };;
|
||
{ .mii; getf.sig r16=f73
|
||
cmp.ltu p6,p0=r25,r24
|
||
add r26=r26,r25 };;
|
||
{ .mii;
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r26,r25
|
||
add r26=r26,carry2 };;
|
||
{ .mii; getf.sig r17=f64
|
||
(p6) add carry1=1,carry1
|
||
cmp.ltu p6,p0=r26,carry2 };;
|
||
{ .mii; st8 [r33]=r26,16
|
||
(p6) add carry1=1,carry1 }
|
||
|
||
{ .mii; getf.sig r24=f74
|
||
add r17=r17,r16
|
||
mov carry2=0 };;
|
||
{ .mii; cmp.ltu p7,p0=r17,r16
|
||
add r17=r17,carry1 };;
|
||
|
||
{ .mii; (p7) add carry2=1,carry2
|
||
cmp.ltu p7,p0=r17,carry1};;
|
||
{ .mii; st8 [r32]=r17,16
|
||
(p7) add carry2=1,carry2 };;
|
||
|
||
{ .mii; add r24=r24,carry2 };;
|
||
{ .mii; st8 [r33]=r24 }
|
||
|
||
{ .mib; rum 1<<5 // clear um.mfh
|
||
br.ret.sptk.many b0 };;
|
||
.endp bn_mul_comba4#
|
||
#undef carry2
|
||
#undef carry1
|
||
#endif
|
||
|
||
#if 1
|
||
//
|
||
// BN_ULONG bn_div_words(BN_ULONG h, BN_ULONG l, BN_ULONG d)
|
||
//
|
||
// In the nutshell it's a port of my MIPS III/IV implementation.
|
||
//
|
||
#define AT r14
|
||
#define H r16
|
||
#define HH r20
|
||
#define L r17
|
||
#define D r18
|
||
#define DH r22
|
||
#define I r21
|
||
|
||
#if 0
|
||
// Some preprocessors (most notably HP-UX) apper to be allergic to
|
||
// macros enclosed to parenthesis as these three will be.
|
||
#define cont p16
|
||
#define break p0 // p20
|
||
#define equ p24
|
||
#else
|
||
cont=p16
|
||
break=p0
|
||
equ=p24
|
||
#endif
|
||
|
||
.global abort#
|
||
.global bn_div_words#
|
||
.proc bn_div_words#
|
||
.align 64
|
||
bn_div_words:
|
||
.prologue
|
||
.fframe 0
|
||
.save ar.pfs,r2
|
||
.save b0,r3
|
||
{ .mii; alloc r2=ar.pfs,3,5,0,8
|
||
mov r3=b0
|
||
mov r10=pr };;
|
||
{ .mmb; cmp.eq p6,p0=r34,r0
|
||
mov r8=-1
|
||
(p6) br.ret.spnt.many b0 };;
|
||
|
||
.body
|
||
{ .mii; mov H=r32 // save h
|
||
mov ar.ec=0 // don't rotate at exit
|
||
mov pr.rot=0 }
|
||
{ .mii; mov L=r33 // save l
|
||
mov r36=r0 };;
|
||
|
||
.L_divw_shift: // -vv- note signed comparison
|
||
{ .mfi; (p0) cmp.lt p16,p0=r0,r34 // d
|
||
(p0) shladd r33=r34,1,r0 }
|
||
{ .mfb; (p0) add r35=1,r36
|
||
(p0) nop.f 0x0
|
||
(p16) br.wtop.dpnt .L_divw_shift };;
|
||
|
||
{ .mii; mov D=r34
|
||
shr.u DH=r34,32
|
||
sub r35=64,r36 };;
|
||
{ .mii; setf.sig f7=DH
|
||
shr.u AT=H,r35
|
||
mov I=r36 };;
|
||
{ .mib; cmp.ne p6,p0=r0,AT
|
||
shl H=H,r36
|
||
(p6) br.call.spnt.clr b0=abort };; // overflow, die...
|
||
|
||
{ .mfi; fcvt.xuf.s1 f7=f7
|
||
shr.u AT=L,r35 };;
|
||
{ .mii; shl L=L,r36
|
||
or H=H,AT };;
|
||
|
||
{ .mii; nop.m 0x0
|
||
cmp.leu p6,p0=D,H;;
|
||
(p6) sub H=H,D }
|
||
|
||
{ .mlx; setf.sig f14=D
|
||
movl AT=0xffffffff };;
|
||
///////////////////////////////////////////////////////////
|
||
{ .mii; setf.sig f6=H
|
||
shr.u HH=H,32;;
|
||
cmp.eq p6,p7=HH,DH };;
|
||
{ .mfb;
|
||
(p6) setf.sig f8=AT
|
||
(p7) fcvt.xuf.s1 f6=f6
|
||
(p7) br.call.sptk b6=.L_udiv64_32_b6 };;
|
||
|
||
{ .mfi; getf.sig r33=f8 // q
|
||
xmpy.lu f9=f8,f14 }
|
||
{ .mfi; xmpy.hu f10=f8,f14
|
||
shrp H=H,L,32 };;
|
||
|
||
{ .mmi; getf.sig r35=f9 // tl
|
||
getf.sig r31=f10 };; // th
|
||
|
||
.L_divw_1st_iter:
|
||
{ .mii; (p0) add r32=-1,r33
|
||
(p0) cmp.eq equ,cont=HH,r31 };;
|
||
{ .mii; (p0) cmp.ltu p8,p0=r35,D
|
||
(p0) sub r34=r35,D
|
||
(equ) cmp.leu break,cont=r35,H };;
|
||
{ .mib; (cont) cmp.leu cont,break=HH,r31
|
||
(p8) add r31=-1,r31
|
||
(cont) br.wtop.spnt .L_divw_1st_iter };;
|
||
///////////////////////////////////////////////////////////
|
||
{ .mii; sub H=H,r35
|
||
shl r8=r33,32
|
||
shl L=L,32 };;
|
||
///////////////////////////////////////////////////////////
|
||
{ .mii; setf.sig f6=H
|
||
shr.u HH=H,32;;
|
||
cmp.eq p6,p7=HH,DH };;
|
||
{ .mfb;
|
||
(p6) setf.sig f8=AT
|
||
(p7) fcvt.xuf.s1 f6=f6
|
||
(p7) br.call.sptk b6=.L_udiv64_32_b6 };;
|
||
|
||
{ .mfi; getf.sig r33=f8 // q
|
||
xmpy.lu f9=f8,f14 }
|
||
{ .mfi; xmpy.hu f10=f8,f14
|
||
shrp H=H,L,32 };;
|
||
|
||
{ .mmi; getf.sig r35=f9 // tl
|
||
getf.sig r31=f10 };; // th
|
||
|
||
.L_divw_2nd_iter:
|
||
{ .mii; (p0) add r32=-1,r33
|
||
(p0) cmp.eq equ,cont=HH,r31 };;
|
||
{ .mii; (p0) cmp.ltu p8,p0=r35,D
|
||
(p0) sub r34=r35,D
|
||
(equ) cmp.leu break,cont=r35,H };;
|
||
{ .mib; (cont) cmp.leu cont,break=HH,r31
|
||
(p8) add r31=-1,r31
|
||
(cont) br.wtop.spnt .L_divw_2nd_iter };;
|
||
///////////////////////////////////////////////////////////
|
||
{ .mii; sub H=H,r35
|
||
or r8=r8,r33
|
||
mov ar.pfs=r2 };;
|
||
{ .mii; shr.u r9=H,I // remainder if anybody wants it
|
||
mov pr=r10,0x1ffff }
|
||
{ .mfb; br.ret.sptk.many b0 };;
|
||
|
||
// Unsigned 64 by 32 (well, by 64 for the moment) bit integer division
|
||
// procedure.
|
||
//
|
||
// inputs: f6 = (double)a, f7 = (double)b
|
||
// output: f8 = (int)(a/b)
|
||
// clobbered: f8,f9,f10,f11,pred
|
||
pred=p15
|
||
// This procedure is essentially Intel code and therefore is
|
||
// copyrighted to Intel Corporation (I suppose...). It's sligtly
|
||
// modified for specific needs.
|
||
.align 32
|
||
.skip 16
|
||
.L_udiv64_32_b6:
|
||
frcpa.s1 f8,pred=f6,f7;; // [0] y0 = 1 / b
|
||
|
||
(pred) fnma.s1 f9=f7,f8,f1 // [5] e0 = 1 - b * y0
|
||
(pred) fmpy.s1 f10=f6,f8;; // [5] q0 = a * y0
|
||
(pred) fmpy.s1 f11=f9,f9 // [10] e1 = e0 * e0
|
||
(pred) fma.s1 f10=f9,f10,f10;; // [10] q1 = q0 + e0 * q0
|
||
(pred) fma.s1 f8=f9,f8,f8 //;; // [15] y1 = y0 + e0 * y0
|
||
(pred) fma.s1 f9=f11,f10,f10;; // [15] q2 = q1 + e1 * q1
|
||
(pred) fma.s1 f8=f11,f8,f8 //;; // [20] y2 = y1 + e1 * y1
|
||
(pred) fnma.s1 f10=f7,f9,f6;; // [20] r2 = a - b * q2
|
||
(pred) fma.s1 f8=f10,f8,f9;; // [25] q3 = q2 + r2 * y2
|
||
|
||
fcvt.fxu.trunc.s1 f8=f8 // [30] q = trunc(q3)
|
||
br.ret.sptk.many b6;;
|
||
.endp bn_div_words#
|
||
#endif
|