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frontend/ir/ir_emitter: Alter parameters of FPDoubleToSingle() and FPSingleToDouble() to pass along desired rounding mode

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This will be necessary to special-case the non-IEEE Von Neumann rounding
to odd rounding mode.
This commit is contained in:
Lioncash 2019-03-04 10:44:17 -05:00 • committed by MerryMage
parent 95af9dafbe
commit 7c81a58ed3
7 changed files with 52 additions and 29 deletions
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44
src/backend/x64/emit_x64_floating_point.cpp
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@ -1034,26 +1034,46 @@ void EmitX64::EmitFPCompare64(EmitContext& ctx, IR::Inst* inst) {
void EmitX64::EmitFPSingleToDouble(EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
const auto rounding_mode = static_cast<FP::RoundingMode>(args[1].GetImmediateU8());
code.cvtss2sd(result, result);
if (ctx.FPSCR_DN()) {
ForceToDefaultNaN<64>(code, result);
// We special-case the non-IEEE-defined ToOdd rounding mode.
if (rounding_mode == ctx.FPSCR_RMode() && rounding_mode != FP::RoundingMode::ToOdd) {
const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
code.cvtss2sd(result, result);
if (ctx.FPSCR_DN()) {
ForceToDefaultNaN<64>(code, result);
}
ctx.reg_alloc.DefineValue(inst, result);
} else {
ctx.reg_alloc.HostCall(inst, args[0]);
code.mov(code.ABI_PARAM2.cvt32(), ctx.FPCR());
code.mov(code.ABI_PARAM3.cvt32(), static_cast<u32>(rounding_mode));
code.lea(code.ABI_PARAM4, code.ptr[code.r15 + code.GetJitStateInfo().offsetof_fpsr_exc]);
code.CallFunction(&FP::FPConvert<u64, u32>);
}
ctx.reg_alloc.DefineValue(inst, result);
}
void EmitX64::EmitFPDoubleToSingle(EmitContext& ctx, IR::Inst* inst) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
const auto rounding_mode = static_cast<FP::RoundingMode>(args[1].GetImmediateU8());
code.cvtsd2ss(result, result);
if (ctx.FPSCR_DN()) {
ForceToDefaultNaN<32>(code, result);
// We special-case the non-IEEE-defined ToOdd rounding mode.
if (rounding_mode == ctx.FPSCR_RMode() && rounding_mode != FP::RoundingMode::ToOdd) {
const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
code.cvtsd2ss(result, result);
if (ctx.FPSCR_DN()) {
ForceToDefaultNaN<32>(code, result);
}
ctx.reg_alloc.DefineValue(inst, result);
} else {
ctx.reg_alloc.HostCall(inst, args[0]);
code.mov(code.ABI_PARAM2.cvt32(), ctx.FPCR());
code.mov(code.ABI_PARAM3.cvt32(), static_cast<u32>(rounding_mode));
code.lea(code.ABI_PARAM4, code.ptr[code.r15 + code.GetJitStateInfo().offsetof_fpsr_exc]);
code.CallFunction(&FP::FPConvert<u32, u64>);
}
ctx.reg_alloc.DefineValue(inst, result);
}
template<size_t fsize, bool unsigned_, size_t isize>