emit_x64_floating_point: Simplify EmitFP{Min,Max}{,Numeric}{32,64}
This commit is contained in:
MerryMage
parent
07e0585994
commit
700088408d
1 changed files with 124 additions and 269 deletions
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@ -108,75 +108,6 @@ void ZeroIfNaN(BlockOfCode& code, Xbyak::Xmm xmm_value, Xbyak::Xmm xmm_scratch)
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code.pand(xmm_value, xmm_scratch);
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}
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template<size_t fsize>
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void PreProcessNaNs(BlockOfCode& code, Xbyak::Xmm a, Xbyak::Xmm b, Xbyak::Label& end) {
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using FPT = mp::unsigned_integer_of_size<fsize>;
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Xbyak::Label nan;
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FCODE(ucomis)(a, b);
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code.jp(nan, code.T_NEAR);
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code.SwitchToFarCode();
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code.L(nan);
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code.sub(rsp, 8);
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ABI_PushCallerSaveRegistersAndAdjustStackExcept(code, HostLocXmmIdx(a.getIdx()));
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code.movq(code.ABI_PARAM1, a);
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code.movq(code.ABI_PARAM2, b);
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code.CallFunction(static_cast<FPT(*)(FPT, FPT)>([](FPT a, FPT b) -> FPT {
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return *FP::ProcessNaNs(a, b);
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}));
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code.movq(a, code.ABI_RETURN);
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ABI_PopCallerSaveRegistersAndAdjustStackExcept(code, HostLocXmmIdx(a.getIdx()));
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code.add(rsp, 8);
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code.jmp(end, code.T_NEAR);
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code.SwitchToNearCode();
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}
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template<size_t fsize, typename NaNHandler>
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void PreProcessNaNs(BlockOfCode& code, EmitContext& ctx, Xbyak::Xmm a, Xbyak::Xmm b, Xbyak::Xmm c, Xbyak::Label& end, NaNHandler nan_handler) {
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using FPT = mp::unsigned_integer_of_size<fsize>;
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Xbyak::Label nan;
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FCODE(ucomis)(a, b);
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code.jp(nan, code.T_NEAR);
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FCODE(ucomis)(c, c);
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code.jp(nan, code.T_NEAR);
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code.SwitchToFarCode();
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code.L(nan);
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code.sub(rsp, 8);
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ABI_PushCallerSaveRegistersAndAdjustStackExcept(code, HostLocXmmIdx(a.getIdx()));
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code.movq(code.ABI_PARAM1, a);
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code.movq(code.ABI_PARAM2, b);
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code.movq(code.ABI_PARAM3, c);
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code.mov(code.ABI_PARAM4, ctx.FPCR());
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code.CallFunction(static_cast<FPT(*)(FPT, FPT, FPT, FP::FPCR)>(nan_handler));
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code.movq(a, code.ABI_RETURN);
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ABI_PopCallerSaveRegistersAndAdjustStackExcept(code, HostLocXmmIdx(a.getIdx()));
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code.add(rsp, 8);
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code.jmp(end, code.T_NEAR);
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code.SwitchToNearCode();
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}
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template<size_t fsize>
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void PostProcessNaNs(BlockOfCode& code, Xbyak::Xmm result, Xbyak::Xmm tmp) {
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if constexpr (fsize == 32) {
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code.movaps(tmp, result);
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code.cmpunordps(tmp, tmp);
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code.pslld(tmp, 31);
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code.xorps(result, tmp);
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} else {
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code.movaps(tmp, result);
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code.cmpunordpd(tmp, tmp);
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code.psllq(tmp, 63);
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code.xorps(result, tmp);
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}
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}
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template<size_t fsize>
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void ForceToDefaultNaN(BlockOfCode& code, Xbyak::Xmm result) {
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if (code.DoesCpuSupport(Xbyak::util::Cpu::tAVX)) {
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@ -207,6 +138,21 @@ Xbyak::Label ProcessNaN(BlockOfCode& code, Xbyak::Xmm a) {
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return end;
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}
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template<size_t fsize>
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void PostProcessNaN(BlockOfCode& code, Xbyak::Xmm result, Xbyak::Xmm tmp) {
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if constexpr (fsize == 32) {
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code.movaps(tmp, result);
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code.cmpunordps(tmp, tmp);
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code.pslld(tmp, 31);
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code.xorps(result, tmp);
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} else {
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code.movaps(tmp, result);
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code.cmpunordpd(tmp, tmp);
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code.psllq(tmp, 63);
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code.xorps(result, tmp);
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}
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}
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// This is necessary because x86 and ARM differ in they way they return NaNs from floating point operations
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//
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// ARM behaviour:
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@ -372,47 +318,7 @@ void FPTwoOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, Function fn) {
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if (ctx.FPSCR_DN()) {
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ForceToDefaultNaN<fsize>(code, result);
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} else if (ctx.AccurateNaN()) {
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PostProcessNaNs<fsize>(code, result, ctx.reg_alloc.ScratchXmm());
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}
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code.L(end);
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ctx.reg_alloc.DefineValue(inst, result);
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}
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enum class CallDenormalsAreZero {
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Yes,
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No,
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};
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template <size_t fsize, typename PreprocessFunction, typename Function>
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void FPThreeOp(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, [[maybe_unused]] PreprocessFunction preprocess, Function fn, CallDenormalsAreZero call_denormals_are_zero = CallDenormalsAreZero::No) {
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auto args = ctx.reg_alloc.GetArgumentInfo(inst);
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Xbyak::Label end;
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Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
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Xbyak::Xmm operand = ctx.reg_alloc.UseScratchXmm(args[1]);
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Xbyak::Reg64 gpr_scratch = ctx.reg_alloc.ScratchGpr();
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if (ctx.FPSCR_FTZ() && call_denormals_are_zero == CallDenormalsAreZero::Yes) {
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DenormalsAreZero<fsize>(code, result, gpr_scratch);
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DenormalsAreZero<fsize>(code, operand, gpr_scratch);
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}
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if constexpr(!std::is_same_v<PreprocessFunction, std::nullptr_t>) {
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preprocess(result, operand, gpr_scratch, end);
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}
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if (ctx.AccurateNaN() && !ctx.FPSCR_DN()) {
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PreProcessNaNs<fsize>(code, result, operand, end);
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}
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if constexpr (std::is_member_function_pointer_v<Function>) {
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(code.*fn)(result, operand);
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} else {
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fn(result, operand);
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}
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if (ctx.FPSCR_DN()) {
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ForceToDefaultNaN<fsize>(code, result);
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} else if (ctx.AccurateNaN()) {
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PostProcessNaNs<fsize>(code, result, operand);
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PostProcessNaN<fsize>(code, result, ctx.reg_alloc.ScratchXmm());
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}
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code.L(end);
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@ -528,8 +434,8 @@ void EmitX64::EmitFPDiv64(EmitContext& ctx, IR::Inst* inst) {
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FPThreeOp<64>(code, ctx, inst, &Xbyak::CodeGenerator::divsd);
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}
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template<size_t fsize>
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static void EmitFPMax(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
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template<size_t fsize, bool is_max>
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static void EmitFPMinMax(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
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auto args = ctx.reg_alloc.GetArgumentInfo(inst);
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const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
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@ -545,14 +451,22 @@ static void EmitFPMax(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
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FCODE(ucomis)(result, operand);
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code.jz(equal, code.T_NEAR);
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if constexpr (is_max) {
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FCODE(maxs)(result, operand);
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} else {
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FCODE(mins)(result, operand);
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}
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code.L(end);
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code.SwitchToFarCode();
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code.L(equal);
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code.jp(nan);
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if constexpr (is_max) {
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code.andps(result, operand);
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} else {
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code.orps(result, operand);
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}
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code.jmp(end);
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code.L(nan);
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@ -568,196 +482,137 @@ static void EmitFPMax(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
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ctx.reg_alloc.DefineValue(inst, result);
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}
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void EmitX64::EmitFPMax32(EmitContext& ctx, IR::Inst* inst) {
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EmitFPMax<32>(code, ctx, inst);
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}
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template<size_t fsize, bool is_max>
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static void EmitFPMinMaxNumeric(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
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using FPT = mp::unsigned_integer_of_size<fsize>;
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constexpr u8 mantissa_msb_bit = static_cast<u8>(FP::FPInfo<FPT>::explicit_mantissa_width - 1);
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void EmitX64::EmitFPMax64(EmitContext& ctx, IR::Inst* inst) {
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EmitFPMax<64>(code, ctx, inst);
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}
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void EmitX64::EmitFPMaxNumeric32(EmitContext& ctx, IR::Inst* inst) {
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FPThreeOp<32>(code, ctx, inst, [&](Xbyak::Xmm result, Xbyak::Xmm operand, Xbyak::Reg64 scratch, Xbyak::Label& end){
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Xbyak::Label normal, normal_or_equal, result_is_result;
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code.ucomiss(result, operand);
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code.jnp(normal_or_equal);
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// If operand == QNaN, result = result.
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code.movd(scratch.cvt32(), operand);
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code.shl(scratch.cvt32(), 1);
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code.cmp(scratch.cvt32(), 0xff800000u);
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code.jae(result_is_result);
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// If operand == SNaN, let usual NaN code handle it.
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code.cmp(scratch.cvt32(), 0xff000000u);
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code.ja(normal);
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// If result == SNaN, && operand != NaN, result = result.
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code.movd(scratch.cvt32(), result);
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code.shl(scratch.cvt32(), 1);
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code.cmp(scratch.cvt32(), 0xff800000u);
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code.jnae(result_is_result);
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// If result == QNaN && operand != NaN, result = operand.
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code.movaps(result, operand);
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code.jmp(end, code.T_NEAR);
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code.L(result_is_result);
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code.movaps(operand, result);
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code.jmp(normal);
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code.L(normal_or_equal);
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code.jnz(normal);
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code.andps(operand, result);
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code.L(normal);
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}, &Xbyak::CodeGenerator::maxss, CallDenormalsAreZero::Yes);
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}
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void EmitX64::EmitFPMaxNumeric64(EmitContext& ctx, IR::Inst* inst) {
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FPThreeOp<64>(code, ctx, inst, [&](Xbyak::Xmm result, Xbyak::Xmm operand, Xbyak::Reg64 scratch, Xbyak::Label& end){
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Xbyak::Label normal, normal_or_equal, result_is_result;
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code.ucomisd(result, operand);
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code.jnp(normal_or_equal);
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// If operand == QNaN, result = result.
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code.movq(scratch, operand);
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code.shl(scratch, 1);
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code.cmp(scratch, code.MConst(qword, 0xfff0'0000'0000'0000u));
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code.jae(result_is_result);
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// If operand == SNaN, let usual NaN code handle it.
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code.cmp(scratch, code.MConst(qword, 0xffe0'0000'0000'0000u));
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code.ja(normal);
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// If result == SNaN, && operand != NaN, result = result.
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code.movq(scratch, result);
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code.shl(scratch, 1);
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code.cmp(scratch, code.MConst(qword, 0xfff0'0000'0000'0000u));
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code.jnae(result_is_result);
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// If result == QNaN && operand != NaN, result = operand.
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code.movaps(result, operand);
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code.jmp(end, code.T_NEAR);
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code.L(result_is_result);
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code.movaps(operand, result);
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code.jmp(normal);
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code.L(normal_or_equal);
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code.jnz(normal);
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code.andps(operand, result);
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code.L(normal);
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}, &Xbyak::CodeGenerator::maxsd, CallDenormalsAreZero::Yes);
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}
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template<size_t fsize>
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static void EmitFPMin(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
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auto args = ctx.reg_alloc.GetArgumentInfo(inst);
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const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
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const Xbyak::Xmm operand = ctx.reg_alloc.UseScratchXmm(args[1]);
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const Xbyak::Reg64 gpr_scratch = ctx.reg_alloc.ScratchGpr();
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const Xbyak::Xmm op1 = ctx.reg_alloc.UseScratchXmm(args[0]);
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const Xbyak::Xmm op2 = ctx.reg_alloc.UseScratchXmm(args[1]); // Result stored here!
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Xbyak::Reg tmp = ctx.reg_alloc.ScratchGpr();
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tmp.setBit(fsize);
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const auto move_to_tmp = [&](const Xbyak::Xmm& xmm) {
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if constexpr (fsize == 32) {
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code.movd(tmp.cvt32(), xmm);
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} else {
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code.movq(tmp.cvt64(), xmm);
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}
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};
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if (ctx.FPSCR_FTZ()) {
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DenormalsAreZero<fsize>(code, result, gpr_scratch);
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DenormalsAreZero<fsize>(code, operand, gpr_scratch);
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DenormalsAreZero<fsize>(code, op1, tmp.cvt64());
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DenormalsAreZero<fsize>(code, op2, tmp.cvt64());
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}
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Xbyak::Label equal, end, nan;
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Xbyak::Label end, z, nan, op2_is_nan, snan, maybe_both_nan, normal;
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FCODE(ucomis)(result, operand);
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code.jz(equal, code.T_NEAR);
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FCODE(mins)(result, operand);
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FCODE(ucomis)(op1, op2);
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code.jz(z, code.T_NEAR);
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code.L(normal);
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if constexpr (is_max) {
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FCODE(maxs)(op2, op1);
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} else {
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FCODE(mins)(op2, op1);
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}
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code.L(end);
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code.SwitchToFarCode();
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code.L(equal);
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code.L(z);
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code.jp(nan);
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code.orps(result, operand);
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if constexpr (is_max) {
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code.andps(op2, op1);
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} else {
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code.orps(op2, op1);
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}
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code.jmp(end);
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// NaN requirements:
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// op1 op2 result
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// SNaN anything op1
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// !SNaN SNaN op2
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// QNaN !NaN op2
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// !NaN QNaN op1
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// QNaN QNaN op1
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code.L(nan);
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FCODE(ucomis)(op1, op1);
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code.jnp(op2_is_nan);
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// op1 is NaN
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move_to_tmp(op1);
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code.bt(tmp, mantissa_msb_bit);
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code.jc(maybe_both_nan);
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if (ctx.FPSCR_DN()) {
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code.movaps(result, code.MConst(xword, fsize == 32 ? f32_nan : f64_nan));
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code.L(snan);
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code.movaps(op2, code.MConst(xword, FP::FPInfo<FPT>::DefaultNaN()));
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code.jmp(end);
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} else {
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EmitProcessNaNs<fsize>(code, result, result, operand, gpr_scratch, end);
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code.movaps(op2, op1);
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code.L(snan);
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code.orps(op2, code.MConst(xword, FP::FPInfo<FPT>::mantissa_msb));
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code.jmp(end);
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}
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code.L(maybe_both_nan);
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FCODE(ucomis)(op2, op2);
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code.jnp(end, code.T_NEAR);
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if (ctx.FPSCR_DN()) {
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code.jmp(snan);
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} else {
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move_to_tmp(op2);
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code.bt(tmp.cvt64(), mantissa_msb_bit);
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code.jnc(snan);
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code.movaps(op2, op1);
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code.jmp(end);
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}
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// op2 is NaN
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code.L(op2_is_nan);
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move_to_tmp(op2);
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code.bt(tmp, mantissa_msb_bit);
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code.jnc(snan);
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code.movaps(op2, op1);
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code.jmp(end);
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code.SwitchToNearCode();
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ctx.reg_alloc.DefineValue(inst, result);
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ctx.reg_alloc.DefineValue(inst, op2);
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}
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void EmitX64::EmitFPMax32(EmitContext& ctx, IR::Inst* inst) {
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EmitFPMinMax<32, true>(code, ctx, inst);
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}
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void EmitX64::EmitFPMax64(EmitContext& ctx, IR::Inst* inst) {
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EmitFPMinMax<64, true>(code, ctx, inst);
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}
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void EmitX64::EmitFPMaxNumeric32(EmitContext& ctx, IR::Inst* inst) {
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EmitFPMinMaxNumeric<32, true>(code, ctx, inst);
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}
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void EmitX64::EmitFPMaxNumeric64(EmitContext& ctx, IR::Inst* inst) {
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EmitFPMinMaxNumeric<64, true>(code, ctx, inst);
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}
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void EmitX64::EmitFPMin32(EmitContext& ctx, IR::Inst* inst) {
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EmitFPMin<32>(code, ctx, inst);
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EmitFPMinMax<32, false>(code, ctx, inst);
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}
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void EmitX64::EmitFPMin64(EmitContext& ctx, IR::Inst* inst) {
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EmitFPMin<64>(code, ctx, inst);
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EmitFPMinMax<64, false>(code, ctx, inst);
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}
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void EmitX64::EmitFPMinNumeric32(EmitContext& ctx, IR::Inst* inst) {
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FPThreeOp<32>(code, ctx, inst, [&](Xbyak::Xmm result, Xbyak::Xmm operand, Xbyak::Reg64 scratch, Xbyak::Label& end){
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Xbyak::Label normal, normal_or_equal, result_is_result;
|
||||
|
||||
code.ucomiss(result, operand);
|
||||
code.jnp(normal_or_equal);
|
||||
// If operand == QNaN, result = result.
|
||||
code.movd(scratch.cvt32(), operand);
|
||||
code.shl(scratch.cvt32(), 1);
|
||||
code.cmp(scratch.cvt32(), 0xff800000u);
|
||||
code.jae(result_is_result);
|
||||
// If operand == SNaN, let usual NaN code handle it.
|
||||
code.cmp(scratch.cvt32(), 0xff000000u);
|
||||
code.ja(normal);
|
||||
// If result == SNaN, && operand != NaN, result = result.
|
||||
code.movd(scratch.cvt32(), result);
|
||||
code.shl(scratch.cvt32(), 1);
|
||||
code.cmp(scratch.cvt32(), 0xff800000u);
|
||||
code.jnae(result_is_result);
|
||||
// If result == QNaN && operand != NaN, result = operand.
|
||||
code.movaps(result, operand);
|
||||
code.jmp(end, code.T_NEAR);
|
||||
|
||||
code.L(result_is_result);
|
||||
code.movaps(operand, result);
|
||||
code.jmp(normal);
|
||||
|
||||
code.L(normal_or_equal);
|
||||
code.jnz(normal);
|
||||
code.orps(operand, result);
|
||||
code.L(normal);
|
||||
}, &Xbyak::CodeGenerator::minss, CallDenormalsAreZero::Yes);
|
||||
EmitFPMinMaxNumeric<32, false>(code, ctx, inst);
|
||||
}
|
||||
|
||||
void EmitX64::EmitFPMinNumeric64(EmitContext& ctx, IR::Inst* inst) {
|
||||
FPThreeOp<64>(code, ctx, inst, [&](Xbyak::Xmm result, Xbyak::Xmm operand, Xbyak::Reg64 scratch, Xbyak::Label& end){
|
||||
Xbyak::Label normal, normal_or_equal, result_is_result;
|
||||
|
||||
code.ucomisd(result, operand);
|
||||
code.jnp(normal_or_equal);
|
||||
// If operand == QNaN, result = result.
|
||||
code.movq(scratch, operand);
|
||||
code.shl(scratch, 1);
|
||||
code.cmp(scratch, code.MConst(qword, 0xfff0'0000'0000'0000u));
|
||||
code.jae(result_is_result);
|
||||
// If operand == SNaN, let usual NaN code handle it.
|
||||
code.cmp(scratch, code.MConst(qword, 0xffe0'0000'0000'0000u));
|
||||
code.ja(normal);
|
||||
// If result == SNaN, && operand != NaN, result = result.
|
||||
code.movq(scratch, result);
|
||||
code.shl(scratch, 1);
|
||||
code.cmp(scratch, code.MConst(qword, 0xfff0'0000'0000'0000u));
|
||||
code.jnae(result_is_result);
|
||||
// If result == QNaN && operand != NaN, result = operand.
|
||||
code.movaps(result, operand);
|
||||
code.jmp(end, code.T_NEAR);
|
||||
|
||||
code.L(result_is_result);
|
||||
code.movaps(operand, result);
|
||||
code.jmp(normal);
|
||||
|
||||
code.L(normal_or_equal);
|
||||
code.jnz(normal);
|
||||
code.orps(operand, result);
|
||||
code.L(normal);
|
||||
}, &Xbyak::CodeGenerator::minsd, CallDenormalsAreZero::Yes);
|
||||
EmitFPMinMaxNumeric<64, false>(code, ctx, inst);
|
||||
}
|
||||
|
||||
void EmitX64::EmitFPMul32(EmitContext& ctx, IR::Inst* inst) {
|
||||
|
|
|
|||
Loading…
Reference in a new issue