25 lines
719 B
C
25 lines
719 B
C
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/* Copyright (c) 2016 Cryptography Research, Inc.
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* Released under the MIT License. See LICENSE.txt for license information.
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*/
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#ifndef __ARCH_ARM_32_ARCH_INTRINSICS_H__
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#define __ARCH_ARM_32_ARCH_INTRINSICS_H__
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#define ARCH_WORD_BITS 32
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static __inline__ __attribute((always_inline,unused))
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uint32_t word_is_zero(uint32_t a) {
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uint32_t ret;
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asm("subs %0, %1, #1;\n\tsbc %0, %0, %0" : "=r"(ret) : "r"(a) : "cc");
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return ret;
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}
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static __inline__ __attribute((always_inline,unused))
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uint64_t widemul(uint32_t a, uint32_t b) {
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/* Could be UMULL, but it's hard to express to CC that the registers must be different */
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return ((uint64_t)a) * b;
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}
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#endif /* __ARCH_ARM_32_ARCH_INTRINSICS_H__ */
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