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Implement CLZ

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Includes tests
This commit is contained in:
MerryMage 2016-12-04 22:56:33 +00:00
parent 1a1646d962
commit 5c1aab1666
8 changed files with 64 additions and 2 deletions
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21
src/backend_x64/emit_x64.cpp
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@ -1540,6 +1540,27 @@ void EmitX64::EmitPackedSaturatedSubS16(IR::Block& block, IR::Inst* inst) {
EmitPackedOperation(code, reg_alloc, inst, &Xbyak::CodeGenerator::psubsw);
}
void EmitX64::EmitCountLeadingZeros(IR::Block& block, IR::Inst* inst) {
IR::Value a = inst->GetArg(0);
if (cpu_info.has(Xbyak::util::Cpu::tLZCNT)) {
Xbyak::Reg32 source = reg_alloc.UseGpr(a).cvt32();
Xbyak::Reg32 result = reg_alloc.DefGpr(inst).cvt32();
code->lzcnt(result, source);
} else {
Xbyak::Reg32 source = reg_alloc.UseScratchGpr(a).cvt32();
Xbyak::Reg32 result = reg_alloc.DefGpr(inst).cvt32();
// The result of a bsr of zero is undefined, but zf is set after it.
code->bsr(result, source);
code->mov(source, 0xFFFFFFFF);
code->cmovz(result, source);
code->neg(result);
code->add(result, 31);
}
}
static void DenormalsAreZero32(BlockOfCode* code, Xbyak::Xmm xmm_value, Xbyak::Reg32 gpr_scratch) {
using namespace Xbyak::util;
Xbyak::Label end;