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roll up chi loop for gcc -Os

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2024-02-14 13:46:30 +00:00
parent 1cf3585ee4
commit 693fb4f0b2
1 changed files with 10 additions and 5 deletions
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15
library/sha3.c
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@ -10,6 +10,8 @@
* https://nvlpubs.nist.gov/nistpubs/fips/nist.fips.202.pdf
*/
#include "common.h"
/*
* These macros select manually unrolled implementations of parts of the main permutation function.
*
@ -23,9 +25,13 @@
#undef MBEDTLS_SHA3_THETA_UNROLL //no-check-names
#define MBEDTLS_SHA3_RHO_UNROLL //no-check-names
#define MBEDTLS_SHA3_PI_UNROLL //no-check-names
#undef MBEDTLS_SHA3_CHI_UNROLL //no-check-names
#include "common.h"
#if !defined(MBEDTLS_COMPILER_IS_GCC) || defined(__OPTIMIZE_SIZE__)
/* GCC doesn't perform well with the rolled-up version, especially at -O2, so only enable on gcc
* if optimising for size. Always enable for other compilers. */
#undef MBEDTLS_SHA3_CHI_UNROLL //no-check-names
#else
#define MBEDTLS_SHA3_CHI_UNROLL //no-check-names
#endif
#if defined(MBEDTLS_SHA3_C)
@ -156,8 +162,7 @@ static void keccak_f1600(mbedtls_sha3_context *ctx)
#endif
/* Chi */
#if !defined(MBEDTLS_SHA3_CHI_UNROLL) && !defined(MBEDTLS_COMPILER_IS_GCC) //no-check-names
/* GCC doesn't perform well with the rolled-up version, especially at -O2. */
#if !defined(MBEDTLS_SHA3_CHI_UNROLL) //no-check-names
for (i = 0; i <= 20; i += 5) {
lane[0] = s[i]; lane[1] = s[i + 1]; lane[2] = s[i + 2]; lane[3] = s[i + 3]; lane[4] = s[i + 4];
s[i + 0] ^= (~lane[1]) & lane[2];