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IR: Implement FPRoundInt

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This commit is contained in:
MerryMage 2018-07-16 13:49:15 +01:00
parent e24054f4d7
commit b228694012
5 changed files with 67 additions and 2 deletions
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53
src/backend_x64/emit_x64_floating_point.cpp
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@ -793,6 +793,59 @@ void EmitX64::EmitFPMulAdd64(EmitContext& ctx, IR::Inst* inst) {
});
}
static void EmitFPRound(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst, size_t fsize) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const auto rounding = static_cast<FP::RoundingMode>(args[1].GetImmediateU8());
const bool exact = args[2].GetImmediateU1();
using fsize_list = mp::list<mp::vlift<size_t(32)>, mp::vlift<size_t(64)>>;
using rounding_list = mp::list<
std::integral_constant<FP::RoundingMode, FP::RoundingMode::ToNearest_TieEven>,
std::integral_constant<FP::RoundingMode, FP::RoundingMode::TowardsPlusInfinity>,
std::integral_constant<FP::RoundingMode, FP::RoundingMode::TowardsMinusInfinity>,
std::integral_constant<FP::RoundingMode, FP::RoundingMode::TowardsZero>,
std::integral_constant<FP::RoundingMode, FP::RoundingMode::ToNearest_TieAwayFromZero>
>;
using exact_list = mp::list<mp::vlift<true>, mp::vlift<false>>;
using key_type = std::tuple<size_t, FP::RoundingMode, bool>;
using value_type = u64(*)(u64, FP::FPSR&, A64::FPCR);
static const auto lut = mp::GenerateLookupTableFromList<key_type, value_type>(
[](auto args) {
return std::pair<key_type, value_type>{
mp::to_tuple<decltype(args)>,
static_cast<value_type>(
[](u64 input, FP::FPSR& fpsr, A64::FPCR fpcr) {
constexpr auto t = mp::to_tuple<decltype(args)>;
constexpr size_t fsize = std::get<0>(t);
constexpr FP::RoundingMode rounding_mode = std::get<1>(t);
constexpr bool exact = std::get<2>(t);
using InputSize = mp::unsigned_integer_of_size<fsize>;
return FP::FPRoundInt<InputSize>(static_cast<InputSize>(input), fpcr, rounding_mode, exact, fpsr);
}
)
};
},
mp::cartesian_product<fsize_list, rounding_list, exact_list>{}
);
ctx.reg_alloc.HostCall(inst, args[0]);
code.lea(code.ABI_PARAM2, code.ptr[code.r15 + code.GetJitStateInfo().offsetof_fpsr_exc]);
code.mov(code.ABI_PARAM3.cvt32(), ctx.FPCR());
code.CallFunction(lut.at(std::make_tuple(fsize, rounding, exact)));
}
void EmitX64::EmitFPRoundInt32(EmitContext& ctx, IR::Inst* inst) {
EmitFPRound(code, ctx, inst, 32);
}
void EmitX64::EmitFPRoundInt64(EmitContext& ctx, IR::Inst* inst) {
EmitFPRound(code, ctx, inst, 64);
}
void EmitX64::EmitFPSqrt32(EmitContext& ctx, IR::Inst* inst) {
FPTwoOp32(code, ctx, inst, &Xbyak::CodeGenerator::sqrtss);
}