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Curve25519: Conservatively force noinline on ADX code paths. #1717

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Oct 9, 2023
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Curve25519: Conservatively force noinline on ADX code paths. #1717

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2 changes: 2 additions & 0 deletions third_party/fiat/curve25519_64_adx.h
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Original file line number Diff line number Diff line change
Expand Up @@ -464,6 +464,7 @@ static void fe4_invert(fe4 out, const fe4 z) {
fe4_mul(out, t1, t0);
}

__attribute__((noinline)) // https://github.com/rust-lang/rust/issues/116573
__attribute__((target("adx,bmi2")))
void x25519_scalar_mult_adx(uint8_t out[32], const uint8_t scalar[32],
const uint8_t point[32]) {
Expand Down Expand Up @@ -640,6 +641,7 @@ static inline void table_select_4(ge_precomp_4 *t, const int pos,
//
// Preconditions:
// a[31] <= 127
__attribute__((noinline)) // https://github.com/rust-lang/rust/issues/116573
__attribute__((target("adx,bmi2")))
void x25519_ge_scalarmult_base_adx(uint8_t h[4][32], const uint8_t a[32]) {
signed char e[64];
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