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Simplify aarch64 asm for mbedtls_ct_uint_lt

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-08-21 07:58:50 +01:00
parent 3ab114e3da
commit 0ce0fbc32a
1 changed files with 5 additions and 5 deletions
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10
library/constant_time_impl.h
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@ -234,14 +234,14 @@ static inline mbedtls_ct_uint_t mbedtls_ct_if(mbedtls_ct_condition_t condition,
static inline mbedtls_ct_condition_t mbedtls_ct_uint_lt(mbedtls_ct_uint_t x, mbedtls_ct_uint_t y)
{
#if defined(MBEDTLS_CT_AARCH64_ASM) && (defined(MBEDTLS_CT_SIZE_32) || defined(MBEDTLS_CT_SIZE_64))
uint64_t s1, s2;
uint64_t s1;
asm volatile ("eor %x[s1], %x[y], %x[x] \n\t"
"sub %x[s2], %x[x], %x[y] \n\t"
"bic %x[s2], %x[s2], %[s1] \n\t"
"sub %x[x], %x[x], %x[y] \n\t"
"bic %x[x], %x[x], %[s1] \n\t"
"and %x[s1], %x[s1], %x[y] \n\t"
"orr %x[s1], %x[s2], %x[s1] \n\t"
"orr %x[s1], %x[x], %x[s1] \n\t"
"asr %x[x], %x[s1], 63"
: [s1] "=&r" (s1), [s2] "=&r" (s2), [x] "+r" (x)
: [s1] "=&r" (s1), [x] "+&r" (x)
: [y] "r" (y)
:
);