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Implement USUB8

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This commit is contained in:
MerryMage
2016-12-05 00:27:59 +00:00
parent 5c1aab1666
commit 52e1445f43
5 changed files with 62 additions and 1 deletions
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46
src/backend_x64/emit_x64.cpp
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@@ -1289,6 +1289,52 @@ void EmitX64::EmitPackedAddU8(IR::Block& block, IR::Inst* inst) {
}
}
void EmitX64::EmitPackedSubU8(IR::Block& block, IR::Inst* inst) {
auto ge_inst = inst->GetAssociatedPseudoOperation(IR::Opcode::GetGEFromOp);
IR::Value a = inst->GetArg(0);
IR::Value b = inst->GetArg(1);
Xbyak::Reg32 reg_a = reg_alloc.UseDefGpr(a, inst).cvt32();
Xbyak::Reg32 reg_b = reg_alloc.UseGpr(b).cvt32();
Xbyak::Reg32 reg_ge;
Xbyak::Xmm xmm_a = reg_alloc.ScratchXmm();
Xbyak::Xmm xmm_b = reg_alloc.ScratchXmm();
Xbyak::Xmm xmm_ge;
if (ge_inst) {
EraseInstruction(block, ge_inst);
inst->DecrementRemainingUses();
reg_ge = reg_alloc.DefGpr(ge_inst).cvt32();
xmm_ge = reg_alloc.ScratchXmm();
}
code->movd(xmm_a, reg_a);
code->movd(xmm_b, reg_b);
if (ge_inst) {
code->movaps(xmm_ge, xmm_a);
code->pmaxub(xmm_ge, xmm_b);
code->pcmpeqb(xmm_ge, xmm_a);
code->movd(reg_ge, xmm_ge);
}
code->psubb(xmm_a, xmm_b);
code->movd(reg_a, xmm_a);
if (ge_inst) {
if (cpu_info.has(Xbyak::util::Cpu::tBMI2)) {
Xbyak::Reg32 tmp = reg_alloc.ScratchGpr().cvt32();
code->mov(tmp, 0x80808080);
code->pext(reg_ge, reg_ge, tmp);
} else {
code->and_(reg_ge, 0x80808080);
code->imul(reg_ge, reg_ge, 0x0204081);
code->shr(reg_ge, 28);
}
}
}
void EmitX64::EmitPackedHalvingAddU8(IR::Block& block, IR::Inst* inst) {
IR::Value a = inst->GetArg(0);
IR::Value b = inst->GetArg(1);