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x86jit: Small Clz codesize optimization.

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2023-08-28 21:17:06 -07:00
parent 1bfa054a41
commit 0cb6a17ea3
1 changed files with 3 additions and 3 deletions
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Core/MIPS/x86/X64IRCompALU.cpp
+3 -3
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@@ -160,11 +160,11 @@ void X64JitBackend::CompIR_Bits(IRInst inst) {
if (cpu_info.bLZCNT) {
LZCNT(32, regs_.RX(inst.dest), regs_.R(inst.src1));
} else {
BSR(32, SCRATCH1, regs_.R(inst.src1));
BSR(32, regs_.RX(inst.dest), regs_.R(inst.src1));
FixupBranch notFound = J_CC(CC_Z);
MOV(32, regs_.R(inst.dest), Imm32(31));
SUB(32, regs_.R(inst.dest), R(SCRATCH1));
// Since one of these bits must be set, and none outside, this subtracts from 31.
XOR(32, regs_.R(inst.dest), Imm8(31));
FixupBranch skip = J();
SetJumpTarget(notFound);