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emit_x64{_vector}_floating_point: Add unsafe optimizations for RSqrtEstimate and RecipEstimate

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This commit is contained in:
MerryMage
2020-07-11 14:02:55 +01:00
parent 761e95eec0
commit 82417da780
2 changed files with 106 additions and 20 deletions
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68
src/backend/x64/emit_x64_floating_point.cpp
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@@ -738,8 +738,29 @@ void EmitX64::EmitFPMulX64(EmitContext& ctx, IR::Inst* inst) {
EmitFPMulX<64>(code, ctx, inst);
}
template<typename FPT>
template<size_t fsize>
static void EmitFPRecipEstimate(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
using FPT = mp::unsigned_integer_of_size<fsize>;
if constexpr (fsize != 16) {
if (ctx.UnsafeOptimizations()) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm operand = ctx.reg_alloc.UseXmm(args[0]);
const Xbyak::Xmm result = ctx.reg_alloc.ScratchXmm();
if constexpr (fsize == 32) {
code.rcpss(result, operand);
} else {
code.cvtsd2ss(result, operand);
code.rcpss(result, result);
code.cvtss2sd(result, result);
}
ctx.reg_alloc.DefineValue(inst, result);
return;
}
}
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
ctx.reg_alloc.HostCall(inst, args[0]);
code.mov(code.ABI_PARAM2.cvt32(), ctx.FPCR().Value());
@@ -748,19 +769,21 @@ static void EmitFPRecipEstimate(BlockOfCode& code, EmitContext& ctx, IR::Inst* i
}
void EmitX64::EmitFPRecipEstimate16(EmitContext& ctx, IR::Inst* inst) {
EmitFPRecipEstimate<u16>(code, ctx, inst);
EmitFPRecipEstimate<16>(code, ctx, inst);
}
void EmitX64::EmitFPRecipEstimate32(EmitContext& ctx, IR::Inst* inst) {
EmitFPRecipEstimate<u32>(code, ctx, inst);
EmitFPRecipEstimate<32>(code, ctx, inst);
}
void EmitX64::EmitFPRecipEstimate64(EmitContext& ctx, IR::Inst* inst) {
EmitFPRecipEstimate<u64>(code, ctx, inst);
EmitFPRecipEstimate<64>(code, ctx, inst);
}
template <typename FPT>
template <size_t fsize>
static void EmitFPRecipExponent(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
using FPT = mp::unsigned_integer_of_size<fsize>;
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
ctx.reg_alloc.HostCall(inst, args[0]);
code.mov(code.ABI_PARAM2.cvt32(), ctx.FPCR().Value());
@@ -769,15 +792,15 @@ static void EmitFPRecipExponent(BlockOfCode& code, EmitContext& ctx, IR::Inst* i
}
void EmitX64::EmitFPRecipExponent16(EmitContext& ctx, IR::Inst* inst) {
EmitFPRecipExponent<u16>(code, ctx, inst);
EmitFPRecipExponent<16>(code, ctx, inst);
}
void EmitX64::EmitFPRecipExponent32(EmitContext& ctx, IR::Inst* inst) {
EmitFPRecipExponent<u32>(code, ctx, inst);
EmitFPRecipExponent<32>(code, ctx, inst);
}
void EmitX64::EmitFPRecipExponent64(EmitContext& ctx, IR::Inst* inst) {
EmitFPRecipExponent<u64>(code, ctx, inst);
EmitFPRecipExponent<64>(code, ctx, inst);
}
template<size_t fsize>
@@ -911,8 +934,29 @@ void EmitX64::EmitFPRoundInt64(EmitContext& ctx, IR::Inst* inst) {
EmitFPRound(code, ctx, inst, 64);
}
template<typename FPT>
template<size_t fsize>
static void EmitFPRSqrtEstimate(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
using FPT = mp::unsigned_integer_of_size<fsize>;
if constexpr (fsize != 16) {
if (ctx.UnsafeOptimizations()) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm operand = ctx.reg_alloc.UseXmm(args[0]);
const Xbyak::Xmm result = ctx.reg_alloc.ScratchXmm();
if constexpr (fsize == 32) {
code.rsqrtss(result, operand);
} else {
code.cvtsd2ss(result, operand);
code.rsqrtss(result, result);
code.cvtss2sd(result, result);
}
ctx.reg_alloc.DefineValue(inst, result);
return;
}
}
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
ctx.reg_alloc.HostCall(inst, args[0]);
code.mov(code.ABI_PARAM2.cvt32(), ctx.FPCR().Value());
@@ -921,15 +965,15 @@ static void EmitFPRSqrtEstimate(BlockOfCode& code, EmitContext& ctx, IR::Inst* i
}
void EmitX64::EmitFPRSqrtEstimate16(EmitContext& ctx, IR::Inst* inst) {
EmitFPRSqrtEstimate<u16>(code, ctx, inst);
EmitFPRSqrtEstimate<16>(code, ctx, inst);
}
void EmitX64::EmitFPRSqrtEstimate32(EmitContext& ctx, IR::Inst* inst) {
EmitFPRSqrtEstimate<u32>(code, ctx, inst);
EmitFPRSqrtEstimate<32>(code, ctx, inst);
}
void EmitX64::EmitFPRSqrtEstimate64(EmitContext& ctx, IR::Inst* inst) {
EmitFPRSqrtEstimate<u64>(code, ctx, inst);
EmitFPRSqrtEstimate<64>(code, ctx, inst);
}
template<size_t fsize>