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emit_x64_floating_point: Hardware FMA implementation of FPRecipStepFused{32,64}

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MerryMage 2018-09-12 14:03:46 +01:00
parent 1492573267
commit 344ee76aba
1 changed files with 41 additions and 3 deletions
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44
src/backend/x64/emit_x64_floating_point.cpp
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@ -719,8 +719,46 @@ void EmitX64::EmitFPRecipEstimate64(EmitContext& ctx, IR::Inst* inst) {
EmitFPRecipEstimate<u64>(code, ctx, inst);
}
template<typename FPT>
template<size_t fsize>
static void EmitFPRecipStepFused(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
using FPT = mp::unsigned_integer_of_size<fsize>;
if (code.DoesCpuSupport(Xbyak::util::Cpu::tFMA)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
Xbyak::Label end, fallback;
const Xbyak::Xmm operand1 = ctx.reg_alloc.UseXmm(args[0]);
const Xbyak::Xmm operand2 = ctx.reg_alloc.UseXmm(args[1]);
const Xbyak::Xmm result = ctx.reg_alloc.ScratchXmm();
code.movaps(result, code.MConst(xword, FP::FPValue<FPT, false, 0, 2>()));
FCODE(vfnmadd231s)(result, operand1, operand2);
FCODE(ucomis)(result, result);
code.jp(fallback, code.T_NEAR);
code.L(end);
code.SwitchToFarCode();
code.L(fallback);
code.sub(rsp, 8);
ABI_PushCallerSaveRegistersAndAdjustStackExcept(code, HostLocXmmIdx(result.getIdx()));
code.movq(code.ABI_PARAM1, operand1);
code.movq(code.ABI_PARAM2, operand2);
code.mov(code.ABI_PARAM3.cvt32(), ctx.FPCR());
code.lea(code.ABI_PARAM4, code.ptr[code.r15 + code.GetJitStateInfo().offsetof_fpsr_exc]);
code.CallFunction(&FP::FPRecipStepFused<FPT>);
code.movq(result, code.ABI_RETURN);
ABI_PopCallerSaveRegistersAndAdjustStackExcept(code, HostLocXmmIdx(result.getIdx()));
code.add(rsp, 8);
code.jmp(end, code.T_NEAR);
code.SwitchToNearCode();
ctx.reg_alloc.DefineValue(inst, result);
return;
}
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
ctx.reg_alloc.HostCall(inst, args[0], args[1]);
code.mov(code.ABI_PARAM3.cvt32(), ctx.FPCR());
@ -729,11 +767,11 @@ static void EmitFPRecipStepFused(BlockOfCode& code, EmitContext& ctx, IR::Inst*
}
void EmitX64::EmitFPRecipStepFused32(EmitContext& ctx, IR::Inst* inst) {
EmitFPRecipStepFused<u32>(code, ctx, inst);
EmitFPRecipStepFused<32>(code, ctx, inst);
}
void EmitX64::EmitFPRecipStepFused64(EmitContext& ctx, IR::Inst* inst) {
EmitFPRecipStepFused<u64>(code, ctx, inst);
EmitFPRecipStepFused<64>(code, ctx, inst);
}
static void EmitFPRound(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, size_t fsize) {