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Issue #3049 - loongarch64: fix JIT uint8 clamp lowering

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Basilisk-Dev 2026-04-26 10:03:49 -04:00 • committed by wuggy
commit 3215f75b08
1 changed files with 9 additions and 5 deletions
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14
js/src/jit/loongarch64/MacroAssembler-loongarch64-inl.h
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@ -1455,15 +1455,19 @@ void MacroAssembler::storeUncanonicalizedFloat32(FloatRegister src,
void MacroAssembler::clampIntToUint8(Register reg) {
ScratchRegisterScope scratch(asMasm());
SecondScratchRegisterScope scratch2(asMasm());
MOZ_ASSERT(reg != scratch && reg != scratch2);
MOZ_ASSERT(reg != scratch);
// Clamp semantics operate on int32 values; normalize the upper bits first in
// case the producer left the high 32 bits undefined.
as_slli_w(reg, reg, 0);
as_slt(scratch, reg, zero);
moveIfNotZero(reg, zero, scratch);
as_masknez(reg, reg, scratch);
ma_li(scratch2, Imm32(255));
as_sltui(scratch, reg, 255);
moveIfZero(reg, scratch2, scratch);
as_addi_d(reg, reg, -255);
as_maskeqz(reg, reg, scratch);
as_addi_d(reg, reg, 255);
}
template <class L>