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emit_x64_floating_point: Implement accurate fallback for FPMulAdd{32,64}

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MerryMage
2018-07-23 16:23:05 +01:00
parent e199887fbc
commit 0ce11b7b15
3 changed files with 56 additions and 14 deletions
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29
src/backend_x64/emit_x64_floating_point.cpp
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@@ -766,6 +766,23 @@ void EmitX64::EmitFPMul64(EmitContext& ctx, IR::Inst* inst) {
FPThreeOp64(code, ctx, inst, &Xbyak::CodeGenerator::mulsd);
}
template<typename FPT>
static void EmitFPMulAddFallback(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
ctx.reg_alloc.HostCall(inst, args[0], args[1], args[2]);
code.mov(code.ABI_PARAM4.cvt32(), ctx.FPCR());
#ifdef _WIN32
code.sub(rsp, 16 + ABI_SHADOW_SPACE);
code.lea(rax, code.ptr[code.r15 + code.GetJitStateInfo().offsetof_fpsr_exc]);
code.mov(qword[rsp + ABI_SHADOW_SPACE], rax);
code.CallFunction(&FP::FPMulAdd<FPT>);
code.add(rsp, 16 + ABI_SHADOW_SPACE);
#else
code.lea(code.ABI_PARAM5, code.ptr[code.r15 + code.GetJitStateInfo().offsetof_fpsr_exc]);
code.CallFunction(&FP::FPMulAdd<FPT>);
#endif
}
void EmitX64::EmitFPMulAdd32(EmitContext& ctx, IR::Inst* inst) {
if (code.DoesCpuSupport(Xbyak::util::Cpu::tFMA)) {
FPFourOp32(code, ctx, inst, [&](Xbyak::Xmm result, Xbyak::Xmm operand2, Xbyak::Xmm operand3) {
@@ -774,11 +791,7 @@ void EmitX64::EmitFPMulAdd32(EmitContext& ctx, IR::Inst* inst) {
return;
}
// TODO: Improve accuracy.
FPFourOp32(code, ctx, inst, [&](Xbyak::Xmm result, Xbyak::Xmm operand2, Xbyak::Xmm operand3) {
code.mulss(operand2, operand3);
code.addss(result, operand2);
});
EmitFPMulAddFallback<u32>(code, ctx, inst);
}
void EmitX64::EmitFPMulAdd64(EmitContext& ctx, IR::Inst* inst) {
@@ -789,11 +802,7 @@ void EmitX64::EmitFPMulAdd64(EmitContext& ctx, IR::Inst* inst) {
return;
}
// TODO: Improve accuracy.
FPFourOp64(code, ctx, inst, [&](Xbyak::Xmm result, Xbyak::Xmm operand2, Xbyak::Xmm operand3) {
code.mulsd(operand2, operand3);
code.addsd(result, operand2);
});
EmitFPMulAddFallback<u64>(code, ctx, inst);
}
static void EmitFPRound(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, size_t fsize) {