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Assembly optimized _increment() and _add() for common nonce types

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This commit is contained in:
Frank Denis
2015-12-06 18:11:37 +01:00
parent 5b62287f98
commit b816a44b13
1 changed files with 63 additions and 0 deletions
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src/libsodium/sodium/utils.c
+63
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@@ -170,8 +170,39 @@ void
sodium_increment(unsigned char *n, const size_t nlen)
{
size_t i = 0U;
uint64_t t64, t64_2;
uint32_t t32;
uint_fast16_t c = 1U;
#ifdef HAVE_AMD64_ASM
if (nlen == 12U) {
__asm__ __volatile__("xorq %[t64], %[t64] \n"
"xorl %[t32], %[t32] \n"
"stc \n"
"adcq %[t64], (%[out]) \n"
"adcl %[t32], 8(%[out]) \n"
: [t64] "=&r"(t64), [t32] "=&r" (t32)
: [out] "D"(n)
: "memory", "flags", "cc");
return;
} else if (nlen == 24U) {
__asm__ __volatile__("movq $1, %[t64] \n"
"xorq %[t64_2], %[t64_2] \n"
"addq %[t64], (%[out]) \n"
"adcq %[t64_2], 8(%[out]) \n"
"adcq %[t64_2], 16(%[out]) \n"
: [t64] "=&r"(t64), [t64_2] "=&r" (t64_2)
: [out] "D"(n)
: "memory", "flags", "cc");
return;
} else if (nlen == 8U) {
__asm__ __volatile__("incq (%[out]) \n"
:
: [out] "D"(n)
: "memory", "flags", "cc");
return;
}
#endif
for (; i < nlen; i++) {
c += (uint_fast16_t) n[i];
n[i] = (unsigned char) c;
@@ -183,8 +214,40 @@ void
sodium_add(unsigned char *a, const unsigned char *b, const size_t len)
{
size_t i = 0U;
uint64_t t64, t64_2, t64_3;
uint32_t t32;
uint_fast16_t c = 0U;
#ifdef HAVE_AMD64_ASM
if (len == 12U) {
__asm__ __volatile__("movq (%[in]), %[t64] \n"
"movl 8(%[in]), %[t32] \n"
"addq %[t64], (%[out]) \n"
"adcl %[t32], 8(%[out]) \n"
: [t64] "=&r"(t64), [t32] "=&r" (t32)
: [in] "S"(b), [out] "D"(a)
: "memory", "flags", "cc");
return;
} else if (len == 24U) {
__asm__ __volatile__("movq (%[in]), %[t64] \n"
"movq 8(%[in]), %[t64_2] \n"
"movq 16(%[in]), %[t64_3] \n"
"addq %[t64], (%[out]) \n"
"adcq %[t64_2], 8(%[out]) \n"
"adcq %[t64_3], 16(%[out]) \n"
: [t64] "=&r"(t64), [t64_2] "=&r"(t64_2), [t64_3] "=&r"(t64_3)
: [in] "S"(b), [out] "D"(a)
: "memory", "flags", "cc");
return;
} else if (len == 8U) {
__asm__ __volatile__("movq (%[in]), %[t64] \n"
"addq %[t64], (%[out]) \n"
: [t64] "=&r"(t64)
: [in] "S"(b), [out] "D"(a)
: "memory", "flags", "cc");
return;
}
#endif
for (; i < len; i++) {
c += (uint_fast16_t) a[i] + (uint_fast16_t) b[i];
a[i] = (unsigned char) c;