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XOR perf improvements

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-05-19 11:48:10 +01:00
parent 399fa48e95
commit 0805ad10b2
2 changed files with 10 additions and 0 deletions
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3
ChangeLog.d/aes-perf.txt Normal file
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@ -0,0 +1,3 @@
Features
* AES performance improvements (XTS, GCM, CCM and CMAC) on 64-bit
architectures, of around 5-10%.

7
library/common.h
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@ -125,6 +125,13 @@ inline void mbedtls_xor(unsigned char *r, const unsigned char *a, const unsigned
{
size_t i = 0;
#if defined(MBEDTLS_EFFICIENT_UNALIGNED_ACCESS)
#if defined(__amd64__) || defined(__x86_64__) || defined(__aarch64__)
/* This codepath probably only makes sense on architectures with 64-bit registers */
for (; (i + 8) <= n; i += 8) {
uint64_t x = mbedtls_get_unaligned_uint64(a + i) ^ mbedtls_get_unaligned_uint64(b + i);
mbedtls_put_unaligned_uint64(r + i, x);
}
#endif
for (; (i + 4) <= n; i += 4) {
uint32_t x = mbedtls_get_unaligned_uint32(a + i) ^ mbedtls_get_unaligned_uint32(b + i);
mbedtls_put_unaligned_uint32(r + i, x);