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crypto/bn/bn_nist.c: bring original failing code back for reference.

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RT: 3541
Reviewed-by: Emilia Kasper <emilia@openssl.org>
This commit is contained in:
Andy Polyakov 2014-09-30 21:00:44 +02:00
parent 7c4776251e
commit 323154be33
1 changed files with 11 additions and 0 deletions
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11
crypto/bn/bn_nist.c
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@ -1108,9 +1108,20 @@ int BN_nist_mod_521(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
/* ... and right shift */
for (val=t_d[0],i=0; i<BN_NIST_521_TOP-1; i++)
{
#if 0
/*
* MSC ARM compiler [version 2013, presumably even earlier,
* much earlier] miscompiles this code, but not one in
* #else section. See RT#3541.
*/
tmp = val>>BN_NIST_521_RSHIFT;
val = t_d[i+1];
t_d[i] = (tmp | val<<BN_NIST_521_LSHIFT) & BN_MASK2;
#else
t_d[i] = ( val>>BN_NIST_521_RSHIFT |
(tmp=t_d[i+1])<<BN_NIST_521_LSHIFT ) & BN_MASK2;
val=tmp;
#endif
}
t_d[i] = val>>BN_NIST_521_RSHIFT;
/* lower 521 bits */