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Add NEON to mbedtls_xor

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-05-22 18:21:20 +01:00
parent 0805ad10b2
commit 6f40f8bf01
1 changed files with 12 additions and 1 deletions
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13
library/common.h
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@ -31,6 +31,10 @@
#include <stdint.h>
#include <stddef.h>
#ifdef __ARM_NEON
#include <arm_neon.h>
#endif /* __ARM_NEON */
/** Helper to define a function as static except when building invasive tests.
*
* If a function is only used inside its own source file and should be
@ -125,7 +129,14 @@ 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__)
#if defined(__aarch64__) && defined(__ARM_NEON)
for (; (i + 16) <= n; i += 16) {
uint64x2_t v1 = vld1q_u64((uint64_t *) a);
uint64x2_t v2 = vld1q_u64((uint64_t *) b);
uint64x2_t x = veorq_u64(v1, v2);
vst1q_u64((uint64_t *) r, x);
}
#elif 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);