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[dynarmic] jit fix branch v2 #203

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crueter merged 27 commits from dynarmic-v2 into master 2025-08-27 06:49:51 +02:00
Conversation 4 Commits 27 Files changed 67 +28 -15
2 changed files with 28 additions and 15 deletions
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41
src/dynarmic/src/dynarmic/backend/x64/emit_x64_vector.cpp
View file

@ -25,6 +25,7 @@
#include "dynarmic/backend/x64/constants.h"
#include "dynarmic/backend/x64/emit_x64.h"
#include "dynarmic/common/math_util.h"
#include "dynarmic/interface/optimization_flags.h"
#include "dynarmic/ir/basic_block.h"
#include "dynarmic/ir/microinstruction.h"
#include "dynarmic/ir/opcodes.h"
@ -1009,10 +1010,7 @@ void EmitX64::EmitVectorCountLeadingZeros8(EmitContext& ctx, IR::Inst* inst) {
code.gf2p8affineqb(result, code.BConst<64>(xword, 0xaaccf0ff'00000000), 8);
ctx.reg_alloc.DefineValue(inst, result);
return;
}
if (code.HasHostFeature(HostFeature::SSSE3)) {
} else if (code.HasHostFeature(HostFeature::SSSE3)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm data = ctx.reg_alloc.UseScratchXmm(args[0]);
@ -1034,10 +1032,9 @@ void EmitX64::EmitVectorCountLeadingZeros8(EmitContext& ctx, IR::Inst* inst) {
code.paddb(data, tmp1);
ctx.reg_alloc.DefineValue(inst, data);
return;
}
} else {
EmitOneArgumentFallback(code, ctx, inst, EmitVectorCountLeadingZeros<u8>);
}
}
void EmitX64::EmitVectorCountLeadingZeros16(EmitContext& ctx, IR::Inst* inst) {
@ -1070,10 +1067,7 @@ void EmitX64::EmitVectorCountLeadingZeros16(EmitContext& ctx, IR::Inst* inst) {
code.vpshufb(result, result, data);
ctx.reg_alloc.DefineValue(inst, result);
return;
}
if (code.HasHostFeature(HostFeature::SSSE3)) {
} else if (code.HasHostFeature(HostFeature::SSSE3)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm data = ctx.reg_alloc.UseScratchXmm(args[0]);
@ -1106,10 +1100,9 @@ void EmitX64::EmitVectorCountLeadingZeros16(EmitContext& ctx, IR::Inst* inst) {
code.pshufb(result, data);
ctx.reg_alloc.DefineValue(inst, result);
return;
}
} else {
EmitOneArgumentFallback(code, ctx, inst, EmitVectorCountLeadingZeros<u16>);
}
}
void EmitX64::EmitVectorCountLeadingZeros32(EmitContext& ctx, IR::Inst* inst) {
@ -5641,6 +5634,7 @@ static void EmitVectorUnsignedAbsoluteDifference(size_t esize, EmitContext& ctx,
break;
}
case 32:
// See https://stackoverflow.com/questions/3380785/compute-the-absolute-difference-between-unsigned-integers-using-sse/3527267#3527267
if (code.HasHostFeature(HostFeature::SSE41)) {
const Xbyak::Xmm x = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm y = ctx.reg_alloc.UseXmm(args[1]);
@ -5652,7 +5646,23 @@ static void EmitVectorUnsignedAbsoluteDifference(size_t esize, EmitContext& ctx,
} else {
const Xbyak::Xmm x = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm y = ctx.reg_alloc.UseScratchXmm(args[1]);
if (ctx.HasOptimization(OptimizationFlag::CodeSpeed)) {
// About 45 bytes
const Xbyak::Xmm temp_x = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm temp_y = ctx.reg_alloc.ScratchXmm();
code.pcmpeqd(temp, temp);
code.pslld(temp, 31);
code.movdqa(temp_x, x);
code.movdqa(temp_y, y);
code.paddd(temp_x, x);
code.paddd(temp_y, y);
code.pcmpgtd(temp_y, temp_x);
code.psubd(x, y);
code.pandn(temp, temp_y);
code.pxor(x, y);
code.psubd(x, y);
} else {
// Smaller code size - about 36 bytes
code.movdqa(temp, code.Const(xword, 0x8000000080000000, 0x8000000080000000));
code.pxor(x, temp);
code.pxor(y, temp);
@ -5662,6 +5672,7 @@ static void EmitVectorUnsignedAbsoluteDifference(size_t esize, EmitContext& ctx,
code.psrld(y, 1);
code.pxor(temp, y);
code.psubd(temp, y);
}
}
break;
}

2
src/dynarmic/src/dynarmic/interface/optimization_flags.h
View file

@ -32,6 +32,8 @@ enum class OptimizationFlag : std::uint32_t {
ConstProp = 0x00000010,
/// This is enables miscellaneous safe IR optimizations.
MiscIROpt = 0x00000020,
/// Optimize for code speed rather than for code size (this serves well for tight loops)
CodeSpeed = 0x00000040,
/// This is an UNSAFE optimization that reduces accuracy of fused multiply-add operations.
/// This unfuses fused instructions to improve performance on host CPUs without FMA support.