suyu/dynarmic
26
1
Fork 1
Code Issues Pull requests Projects Releases Packages Wiki Activity

emit_x64_vector: Refactor AVX2 AVShift32, LVShift{32,64}

Browse source
This commit is contained in:
zmt00 2024-02-22 19:26:15 -08:00 committed by merry
parent 043f21df7d
commit 879142d424
1 changed files with 45 additions and 49 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

94
src/dynarmic/backend/x64/emit_x64_vector.cpp
View file

@ -638,23 +638,22 @@ void EmitX64::EmitVectorArithmeticVShift32(EmitContext& ctx, IR::Inst* inst) {
if (code.HasHostFeature(HostFeature::AVX2)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm left_shift = ctx.reg_alloc.UseScratchXmm(args[1]);
const Xbyak::Xmm right_shift = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm tmp = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm a = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm b = ctx.reg_alloc.UseScratchXmm(args[1]);
const Xbyak::Xmm result = ctx.reg_alloc.ScratchXmm();
code.vmovdqa(tmp, code.Const(xword, 0x000000FF000000FF, 0x000000FF000000FF));
code.vpxor(right_shift, right_shift, right_shift);
code.vpsubd(right_shift, right_shift, left_shift);
// store sign bit of lowest byte of each element of b to select left/right shift later
code.vpslld(xmm0, b, 24);
code.vpslld(xmm0, left_shift, 24);
// sse/avx shifts are only positive, with dedicated left/right forms - shift by lowest byte of abs(b)
code.vpabsb(b, b);
code.vpand(b, b, code.BConst<32>(xword, 0xFF));
code.vpand(right_shift, right_shift, tmp);
code.vpand(left_shift, left_shift, tmp);
// calculate shifts
code.vpsllvd(result, a, b);
code.vpsravd(a, a, b);
code.vpsravd(tmp, result, right_shift);
code.vpsllvd(result, result, left_shift);
code.blendvps(result, tmp);
code.blendvps(result, a); // implicit argument: xmm0 (sign of lowest byte of b)
ctx.reg_alloc.DefineValue(inst, result);
return;
@ -1832,6 +1831,37 @@ void EmitX64::EmitVectorLogicalShiftRight64(EmitContext& ctx, IR::Inst* inst) {
ctx.reg_alloc.DefineValue(inst, result);
}
template<size_t esize>
static void EmitVectorLogicalVShiftAVX2(BlockOfCode& code, EmitContext& ctx, IR::Inst* inst) {
static_assert(esize == 32 || esize == 64);
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm a = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm b = ctx.reg_alloc.UseScratchXmm(args[1]);
const Xbyak::Xmm result = ctx.reg_alloc.ScratchXmm();
// store sign bit of lowest byte of each element of b to select left/right shift later
ICODE(vpsll)(xmm0, b, u8(esize - 8));
// sse/avx shifts are only positive, with dedicated left/right forms - shift by lowest byte of abs(b)
code.vpabsb(b, b);
code.vpand(b, b, code.BConst<esize>(xword, 0xFF));
// calculate shifts
ICODE(vpsllv)(result, a, b);
ICODE(vpsrlv)(a, a, b);
// implicit argument: xmm0 (sign of lowest byte of b)
if constexpr (esize == 32) {
code.blendvps(result, a);
} else {
code.blendvpd(result, a);
}
ctx.reg_alloc.DefineValue(inst, result);
return;
}
void EmitX64::EmitVectorLogicalVShift8(EmitContext& ctx, IR::Inst* inst) {
if (code.HasHostFeature(HostFeature::AVX512_Ortho | HostFeature::AVX512BW | HostFeature::GFNI)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
@ -1909,24 +1939,7 @@ void EmitX64::EmitVectorLogicalVShift16(EmitContext& ctx, IR::Inst* inst) {
void EmitX64::EmitVectorLogicalVShift32(EmitContext& ctx, IR::Inst* inst) {
if (code.HasHostFeature(HostFeature::AVX2)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm left_shift = ctx.reg_alloc.UseScratchXmm(args[1]);
const Xbyak::Xmm right_shift = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm tmp = ctx.reg_alloc.ScratchXmm();
code.vmovdqa(tmp, code.Const(xword, 0x000000FF000000FF, 0x000000FF000000FF));
code.vpxor(right_shift, right_shift, right_shift);
code.vpsubd(right_shift, right_shift, left_shift);
code.vpand(left_shift, left_shift, tmp);
code.vpand(right_shift, right_shift, tmp);
code.vpsllvd(tmp, result, left_shift);
code.vpsrlvd(result, result, right_shift);
code.vpor(result, result, tmp);
ctx.reg_alloc.DefineValue(inst, result);
EmitVectorLogicalVShiftAVX2<32>(code, ctx, inst);
return;
}
@ -1937,24 +1950,7 @@ void EmitX64::EmitVectorLogicalVShift32(EmitContext& ctx, IR::Inst* inst) {
void EmitX64::EmitVectorLogicalVShift64(EmitContext& ctx, IR::Inst* inst) {
if (code.HasHostFeature(HostFeature::AVX2)) {
auto args = ctx.reg_alloc.GetArgumentInfo(inst);
const Xbyak::Xmm result = ctx.reg_alloc.UseScratchXmm(args[0]);
const Xbyak::Xmm left_shift = ctx.reg_alloc.UseScratchXmm(args[1]);
const Xbyak::Xmm right_shift = ctx.reg_alloc.ScratchXmm();
const Xbyak::Xmm tmp = ctx.reg_alloc.ScratchXmm();
code.vmovdqa(tmp, code.Const(xword, 0x00000000000000FF, 0x00000000000000FF));
code.vpxor(right_shift, right_shift, right_shift);
code.vpsubq(right_shift, right_shift, left_shift);
code.vpand(left_shift, left_shift, tmp);
code.vpand(right_shift, right_shift, tmp);
code.vpsllvq(tmp, result, left_shift);
code.vpsrlvq(result, result, right_shift);
code.vpor(result, result, tmp);
ctx.reg_alloc.DefineValue(inst, result);
EmitVectorLogicalVShiftAVX2<64>(code, ctx, inst);
return;
}