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lgc: kill unused outputs based on channelWriteMask
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This is an optimization of output caculations based on
channelWriteMask of the pipeline stats from two aspects:
- Remove export instructions for color targets that have a 0 write mask
- Replace components that aren't used according to the write mask with
  'poision'

(cherry picked from commit fa12be36e0bca4a1ac9c0f4a1be7c6e3e0d63d33)
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@xuechen417
xuechen417 committed Oct 24, 2023
1 parent b10cb3d commit 03c7675
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Showing 10 changed files with 114 additions and 118 deletions.
2 changes: 1 addition & 1 deletion lgc/include/lgc/patch/FragColorExport.h
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,7 @@ class FragColorExport {
FragColorExport &operator=(const FragColorExport &) = delete;

llvm::Value *handleColorExportInstructions(llvm::Value *output, unsigned int hwColorExport, BuilderBase &builder,
ExportFormat expFmt, const bool signedness);
ExportFormat expFmt, const bool signedness, unsigned channelWriteMask);

llvm::Value *convertToHalf(llvm::Value *value, bool signedness, BuilderBase &builder) const;
llvm::Value *convertToFloat(llvm::Value *value, bool signedness, BuilderBase &builder) const;
Expand Down
1 change: 1 addition & 0 deletions lgc/interface/lgc/Pipeline.h
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Original file line number Diff line number Diff line change
Expand Up @@ -454,6 +454,7 @@ struct ColorExportFormat {
unsigned blendEnable; // Blend will be enabled for this target at draw time
unsigned blendSrcAlphaToColor; // Whether source alpha is blended to color channels for this target
// at draw time
unsigned channelWriteMask; // Write mask to specify destination channels
};

// Struct to pass to SetColorExportState
Expand Down
208 changes: 101 additions & 107 deletions lgc/patch/FragColorExport.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,7 @@ LowerFragColorExport::LowerFragColorExport() : m_exportValues(MaxColorTargets +
// @param input : The value we want to extract elements from
// @param builder : The IR builder for inserting instructions
// @param [out] results : The returned elements
static void extractElements(Value *input, BuilderBase &builder, SmallVectorImpl<Value *> &results) {
static void extractElements(Value *input, BuilderBase &builder, std::array<Value *, 4> &results) {
Type *valueTy = input->getType();
unsigned compCount = valueTy->isVectorTy() ? cast<FixedVectorType>(valueTy)->getNumElements() : 1;
assert(compCount <= 4 && "At-most four elements allowed\n");
Expand All @@ -94,8 +94,10 @@ static void extractElements(Value *input, BuilderBase &builder, SmallVectorImpl<
// @param builder : The IR builder for inserting instructions
// @param expFmt: The format for the given render target
// @param signedness: If output should be interpreted as a signed integer
// @param channelWriteMask: Write mask to specify destination channels
Value *FragColorExport::handleColorExportInstructions(Value *output, unsigned hwColorExport, BuilderBase &builder,
ExportFormat expFmt, const bool signedness) {
ExportFormat expFmt, const bool signedness,
unsigned channelWriteMask) {
assert(expFmt != EXP_FORMAT_ZERO);

Type *outputTy = output->getType();
Expand All @@ -116,10 +118,18 @@ Value *FragColorExport::handleColorExportInstructions(Value *output, unsigned hw
floatTy, // EXP_FORMAT_32_ABGR = 9,
};

SmallVector<Value *, 4> comps(4);
const auto undefFloat = PoisonValue::get(builder.getFloatTy());
const auto undefFloat16x2 = PoisonValue::get(FixedVectorType::get(builder.getHalfTy(), 2));

std::array<Value *, 4> comps;
std::array<Value *, 4> exports{undefFloat, undefFloat, undefFloat, undefFloat};
unsigned exportMask = 0;

Type *exportTy = exportTypeMapping[expFmt];

const bool dualSourceBlendedEnable = m_pipelineState->getColorExportState().dualSourceBlendEnable ||
m_pipelineState->getColorExportState().dynamicDualSourceBlendEnable;

// For 32bit output, we always to scalarize, but for 16bit output we may just operate on vector.
if (exportTy->isFloatTy()) {
if (compCount == 1) {
Expand All @@ -130,56 +140,54 @@ Value *FragColorExport::handleColorExportInstructions(Value *output, unsigned hw
}
}

const auto undefFloat = PoisonValue::get(builder.getFloatTy());
const auto undefFloat16x2 = PoisonValue::get(FixedVectorType::get(builder.getHalfTy(), 2));

switch (expFmt) {
case EXP_FORMAT_32_R: {
compCount = 1;
comps[0] = convertToFloat(comps[0], signedness, builder);
break;
}
case EXP_FORMAT_32_GR: {
if (compCount >= 2) {
case EXP_FORMAT_32_R:
case EXP_FORMAT_32_GR:
case EXP_FORMAT_32_ABGR: {
if (expFmt == EXP_FORMAT_32_GR && compCount >= 2)
compCount = 2;
comps[0] = convertToFloat(comps[0], signedness, builder);
comps[1] = convertToFloat(comps[1], signedness, builder);
} else {
else if (expFmt != EXP_FORMAT_32_ABGR)
compCount = 1;
comps[0] = convertToFloat(comps[0], signedness, builder);

for (unsigned idx = 0; idx < compCount; ++idx) {
unsigned compMask = 1 << idx;
if (compMask & channelWriteMask) {
exports[idx] = convertToFloat(comps[idx], signedness, builder);
exportMask |= compMask;
}
}
break;
}
case EXP_FORMAT_32_AR: {
if (compCount == 4) {
if (compCount == 4)
compCount = 2;
comps[0] = convertToFloat(comps[0], signedness, builder);
comps[1] = convertToFloat(comps[3], signedness, builder);
} else {
else
compCount = 1;
comps[0] = convertToFloat(comps[0], signedness, builder);
for (unsigned idx = 0; idx < compCount; ++idx) {
unsigned j = (idx == 1) ? 3 : idx;
unsigned compMask = 1 << j;
if (compMask & channelWriteMask) {
exports[idx] = convertToFloat(comps[j], signedness, builder);
exportMask |= compMask;
}
}
break;
}
case EXP_FORMAT_32_ABGR: {
for (unsigned i = 0; i < compCount; ++i)
comps[i] = convertToFloat(comps[i], signedness, builder);

for (unsigned i = compCount; i < 4; ++i)
comps[i] = undefFloat;
break;
}
case EXP_FORMAT_FP16_ABGR: {
const unsigned compactCompCount = (compCount + 1) / 2;
// convert to half type
if (bitWidth <= 16) {
output = convertToHalf(output, signedness, builder);
extractElements(output, builder, comps);
// re-pack
comps[0] = builder.CreateInsertElement(undefFloat16x2, comps[0], builder.getInt32(0));
comps[0] = builder.CreateInsertElement(comps[0], comps[1], builder.getInt32(1));
if (compCount > 2) {
comps[1] = builder.CreateInsertElement(undefFloat16x2, comps[2], builder.getInt32(0));
comps[1] = builder.CreateInsertElement(comps[1], comps[3], builder.getInt32(1));
for (unsigned idx = 0; idx < compactCompCount; ++idx) {
unsigned origIdx = 2 * idx;
unsigned compMask = (1 << origIdx) | (1 << (origIdx + 1));
if (compMask & channelWriteMask) {
exports[idx] = builder.CreateInsertElement(undefFloat16x2, comps[origIdx], builder.getInt32(0));
exports[idx] = builder.CreateInsertElement(exports[idx], comps[origIdx + 1], builder.getInt32(1));
exportMask |= compMask;
}
}
} else {
if (outputTy->isIntOrIntVectorTy())
Expand All @@ -188,45 +196,61 @@ Value *FragColorExport::handleColorExportInstructions(Value *output, unsigned hw
: builder.getFloatTy());
extractElements(output, builder, comps);

exports[0] = exports[1] = undefFloat16x2;
Attribute::AttrKind attribs[] = {Attribute::ReadNone};
comps[0] = builder.CreateNamedCall("llvm.amdgcn.cvt.pkrtz", FixedVectorType::get(builder.getHalfTy(), 2),
{comps[0], comps[1]}, attribs);
if (compCount > 2)
comps[1] = builder.CreateNamedCall("llvm.amdgcn.cvt.pkrtz", FixedVectorType::get(builder.getHalfTy(), 2),
{comps[2], comps[3]}, attribs);
for (unsigned idx = 0; idx < compactCompCount; ++idx) {
unsigned origIdx = 2 * idx;
unsigned compMask = (1 << origIdx) | (1 << (origIdx + 1));
if (compMask & channelWriteMask) {
exports[idx] = builder.CreateNamedCall("llvm.amdgcn.cvt.pkrtz", FixedVectorType::get(builder.getHalfTy(), 2),
{comps[origIdx], comps[origIdx + 1]}, attribs);
exportMask |= compMask;
}
}
}
break;
}
case EXP_FORMAT_UNORM16_ABGR:
case EXP_FORMAT_SNORM16_ABGR: {
output = convertToFloat(output, signedness, builder);
extractElements(output, builder, comps);

StringRef funcName =
expFmt == EXP_FORMAT_SNORM16_ABGR ? "llvm.amdgcn.cvt.pknorm.i16" : "llvm.amdgcn.cvt.pknorm.u16";

for (unsigned idx = 0; idx < (compCount + 1) / 2; idx++) {
Value *packedComps = builder.CreateNamedCall(funcName, FixedVectorType::get(builder.getInt16Ty(), 2),
{comps[2 * idx], comps[2 * idx + 1]}, {});

comps[idx] = builder.CreateBitCast(packedComps, FixedVectorType::get(builder.getHalfTy(), 2));
// GFX11 removes compressed export, simply use 32bit-data export.
if (m_pipelineState->getTargetInfo().getGfxIpVersion().major >= 11 && !dualSourceBlendedEnable) {
exportMask = (1 << compactCompCount) - 1;
for (unsigned idx = 0; idx < compactCompCount; ++idx)
exports[idx] = builder.CreateBitCast(exports[idx], builder.getFloatTy());
}

break;
}
case EXP_FORMAT_UNORM16_ABGR:
case EXP_FORMAT_SNORM16_ABGR:
case EXP_FORMAT_UINT16_ABGR:
case EXP_FORMAT_SINT16_ABGR: {
assert(compCount <= 4);
output = convertToInt(output, signedness, builder);
extractElements(output, builder, comps);

StringRef funcName = expFmt == EXP_FORMAT_SINT16_ABGR ? "llvm.amdgcn.cvt.pk.i16" : "llvm.amdgcn.cvt.pk.u16";
StringRef funcName;
if (expFmt == EXP_FORMAT_SNORM16_ABGR || expFmt == EXP_FORMAT_UNORM16_ABGR) {
output = convertToFloat(output, signedness, builder);
funcName = EXP_FORMAT_SNORM16_ABGR ? "llvm.amdgcn.cvt.pknorm.i16" : "llvm.amdgcn.cvt.pknorm.u16";
} else {
output = convertToInt(output, signedness, builder);
funcName = expFmt == EXP_FORMAT_SINT16_ABGR ? "llvm.amdgcn.cvt.pk.i16" : "llvm.amdgcn.cvt.pk.u16";
}
extractElements(output, builder, comps);

for (unsigned idx = 0; idx < (compCount + 1) / 2; idx++) {
Value *packedComps = builder.CreateNamedCall(funcName, FixedVectorType::get(builder.getInt16Ty(), 2),
{comps[2 * idx], comps[2 * idx + 1]}, {});
const unsigned compactCompCount = (compCount + 1) / 2;
exports[0] = exports[1] = undefFloat16x2;
for (unsigned idx = 0; idx < compactCompCount; idx++) {
unsigned origIdx = 2 * idx;
unsigned compMask = (1 << origIdx) | (1 << (origIdx + 1));
if (compMask & channelWriteMask) {
Value *packedComps = builder.CreateNamedCall(funcName, FixedVectorType::get(builder.getInt16Ty(), 2),
{comps[2 * idx], comps[2 * idx + 1]}, {});

exports[idx] = builder.CreateBitCast(packedComps, FixedVectorType::get(builder.getHalfTy(), 2));
exportMask |= compMask;
}
}

comps[idx] = builder.CreateBitCast(packedComps, FixedVectorType::get(builder.getHalfTy(), 2));
// GFX11 removes compressed export, simply use 32bit-data export.
if (m_pipelineState->getTargetInfo().getGfxIpVersion().major >= 11 && !dualSourceBlendedEnable) {
exportMask = (1 << compactCompCount) - 1;
for (unsigned idx = 0; idx < compactCompCount; ++idx)
exports[idx] = builder.CreateBitCast(exports[idx], builder.getFloatTy());
}

break;
Expand All @@ -237,67 +261,36 @@ Value *FragColorExport::handleColorExportInstructions(Value *output, unsigned hw
}
}

if (m_pipelineState->getTargetInfo().getGfxIpVersion().major >= 11 &&
(m_pipelineState->getColorExportState().dualSourceBlendEnable ||
m_pipelineState->getColorExportState().dynamicDualSourceBlendEnable)) {
if (m_pipelineState->getTargetInfo().getGfxIpVersion().major >= 11 && dualSourceBlendedEnable) {
// Save them for later dual-source-swizzle
m_blendSourceChannels = exportTy->isHalfTy() ? (compCount + 1) / 2 : compCount;
assert(hwColorExport <= 1);
m_blendSources[hwColorExport].append(comps.begin(), comps.end());
m_blendSources[hwColorExport].append(exports.begin(), exports.end());
return nullptr;
}

Value *exportCall = nullptr;

if (exportTy->isHalfTy()) {
// GFX11 removes compressed export, simply use 32bit-data export.
if (m_pipelineState->getTargetInfo().getGfxIpVersion().major >= 11) {
// Translate compCount into the number of 32bit data.
compCount = (compCount + 1) / 2;
for (unsigned i = 0; i < compCount; i++)
comps[i] = builder.CreateBitCast(comps[i], builder.getFloatTy());
for (unsigned i = compCount; i < 4; i++)
comps[i] = undefFloat;

Value *args[] = {
builder.getInt32(EXP_TARGET_MRT_0 + hwColorExport), // tgt
builder.getInt32((1 << compCount) - 1), // en
comps[0], // src0
comps[1], // src1
comps[2], // src2
comps[3], // src3
builder.getFalse(), // done
builder.getTrue() // vm
};

return builder.CreateNamedCall("llvm.amdgcn.exp.f32", Type::getVoidTy(*m_context), args, {});
}

if (exportTy->isHalfTy() && m_pipelineState->getTargetInfo().getGfxIpVersion().major < 11) {
// 16-bit export (compressed)
if (compCount <= 2)
comps[1] = undefFloat16x2;
Value *args[] = {
builder.getInt32(EXP_TARGET_MRT_0 + hwColorExport), // tgt
builder.getInt32(compCount > 2 ? 0xF : 0x3), // en
comps[0], // src0
comps[1], // src1
builder.getInt32(exportMask), // en
exports[0], // src0
exports[1], // src1
builder.getFalse(), // done
builder.getTrue() // vm
};

exportCall = builder.CreateNamedCall("llvm.amdgcn.exp.compr.v2f16", Type::getVoidTy(*m_context), args, {});
} else {
// 32-bit export
for (unsigned i = compCount; i < 4; i++)
comps[i] = undefFloat;

Value *args[] = {
builder.getInt32(EXP_TARGET_MRT_0 + hwColorExport), // tgt
builder.getInt32((1 << compCount) - 1), // en
comps[0], // src0
comps[1], // src1
comps[2], // src2
comps[3], // src3
builder.getInt32(exportMask), // en
exports[0], // src0
exports[1], // src1
exports[2], // src2
exports[3], // src3
builder.getFalse(), // done
builder.getTrue() // vm
};
Expand Down Expand Up @@ -942,9 +935,10 @@ void FragColorExport::generateExportInstructions(ArrayRef<ColorExportInfo> info,
assert(infoIt->hwColorTarget < MaxColorTargets);

auto expFmt = static_cast<ExportFormat>(m_pipelineState->computeExportFormat(infoIt->ty, location));
if (expFmt != EXP_FORMAT_ZERO) {
const unsigned channelWriteMask = m_pipelineState->getColorExportFormat(location).channelWriteMask;
if (expFmt != EXP_FORMAT_ZERO && channelWriteMask != 0) {
lastExport = handleColorExportInstructions(values[infoIt->hwColorTarget], hwColorExport, builder, expFmt,
infoIt->isSigned);
infoIt->isSigned, channelWriteMask);
finalExportFormats.push_back(expFmt);
++hwColorExport;
}
Expand Down
6 changes: 3 additions & 3 deletions lgc/state/PalMetadata.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1065,9 +1065,9 @@ void PalMetadata::updateCbShaderMask(llvm::ArrayRef<ColorExportInfo> exps) {
for (auto &exp : exps) {
if (exp.hwColorTarget == MaxColorTargets)
continue;

if (m_pipelineState->computeExportFormat(exp.ty, exp.location) != 0) {
cbShaderMask |= (0xF << (4 * exp.location));
const unsigned channelWriteMask = m_pipelineState->getColorExportFormat(exp.location).channelWriteMask;
if (m_pipelineState->computeExportFormat(exp.ty, exp.location) != 0 && channelWriteMask != 0) {
cbShaderMask |= (channelWriteMask << (4 * exp.location));
}
}

Expand Down
2 changes: 1 addition & 1 deletion lgc/state/PipelineState.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1212,7 +1212,7 @@ void PipelineState::recordColorExportState(Module *module) {

// The color export formats named metadata node's operands are:
// - N metadata nodes for N color targets, each one containing
// { dfmt, nfmt, blendEnable, blendSrcAlphaToColor }
// { dfmt, nfmt, blendEnable, blendSrcAlphaToColor, channelWriteMask }
for (const ColorExportFormat &target : m_colorExportFormats)
exportFormatsMetaNode->addOperand(getArrayOfInt32MetaNode(getContext(), target, /*atLeastOneValue=*/true));
}
Expand Down
4 changes: 2 additions & 2 deletions lgc/test/ElfRelocationSize.lgc
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,7 @@ target triple = "amdgcn--amdpal"
!1 = !{i32 -1843601953, i32 337452067, i32 -1234379640, i32 1173800166}
!2 = !{i32 2}
!4 = !{i32 -225903757, i32 -647980161, i32 1491774676, i32 -114025882}
!18 = !{i32 10}
!18 = !{i32 10, i32 0, i32 0, i32 0, i32 15}
!19 = !{i32 0, i32 0, i32 0, i32 0, i32 13, i32 7, i32 -1}
!20 = !{i32 1, i32 0, i32 24, i32 0, i32 11, i32 7, i32 -1}
!21 = !{i32 0, i32 0, i32 0, i32 1}
Expand Down Expand Up @@ -131,7 +131,7 @@ attributes #3 = { nounwind readonly willreturn }
!10 = !{!"DescriptorTableVaPtr", i32 0, i32 0, i32 11, i32 1, i32 1}
!11 = !{!"DescriptorResource", i32 1, i32 0, i32 0, i32 80, i32 0, i32 1, i32 8}
!14 = !{!"DescriptorSampler", i32 2, i32 0, i32 -1, i32 4, i32 0, i32 2, i32 4, i32 12288, i32 117436416, i32 1750073344, i32 -2147483648}
!19 = !{i32 10}
!19 = !{i32 10, i32 0, i32 0, i32 0, i32 15}
!20 = !{i32 6}

; ----------------------------------------------------------------------
Expand Down
4 changes: 2 additions & 2 deletions lgc/test/PartPipeline.lgc
View file
Original file line number Diff line number Diff line change
Expand Up @@ -44,7 +44,7 @@ target triple = "amdgcn--amdpal"
!1 = !{i32 -1843601953, i32 337452067, i32 -1234379640, i32 1173800166}
!2 = !{i32 2}
!4 = !{i32 -225903757, i32 -647980161, i32 1491774676, i32 -114025882}
!18 = !{i32 10}
!18 = !{i32 10, i32 0, i32 0, i32 0, i32 15}
!19 = !{i32 0, i32 0, i32 0, i32 0, i32 13, i32 7, i32 -1}
!20 = !{i32 1, i32 0, i32 24, i32 0, i32 11, i32 7, i32 -1}
!21 = !{i32 0, i32 0, i32 0, i32 1}
Expand Down Expand Up @@ -140,7 +140,7 @@ attributes #3 = { nounwind readonly willreturn }
!10 = !{!"DescriptorTableVaPtr", i32 0, i32 0, i32 11, i32 1, i32 1}
!11 = !{!"DescriptorResource", i32 1, i32 0, i32 0, i32 80, i32 0, i32 1, i32 8}
!14 = !{!"DescriptorSampler", i32 2, i32 0, i32 -1, i32 4, i32 0, i32 2, i32 4, i32 12288, i32 117436416, i32 1750073344, i32 -2147483648}
!19 = !{i32 10}
!19 = !{i32 10, i32 0, i32 0, i32 0, i32 15}
!20 = !{i32 6}

; ----------------------------------------------------------------------
Expand Down
2 changes: 1 addition & 1 deletion lgc/test/TextureRange.lgc
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Original file line number Diff line number Diff line change
Expand Up @@ -147,7 +147,7 @@ attributes #3 = { nounwind readnone }
!10 = !{!"InlineBuffer", i32 14, i32 0, i32 3, i32 1, i32 -1610612736, i32 4, i32 4}
!11 = !{!"DescriptorBufferCompact", i32 10, i32 0, i32 4, i32 4, i32 -536870912, i32 0, i32 2}
!12 = !{!"IndirectUserDataVaPtr", i32 0, i32 0, i32 7, i32 1, i32 0}
!13 = !{i32 16}
!13 = !{i32 16, i32 0, i32 0, i32 0, i32 15}
!14 = !{i32 3, i32 3}
!15 = !{!"\82\B0amdpal.pipelines\91\84\AA.registers\80\B0.spill_threshold\CE\FF\FF\FF\FF\B0.user_data_limit\00\AF.xgl_cache_info\82\B3.128_bit_cache_hash\92\CF\9B\97\D5d\9F\E5\B7\11\CF\E9#\B4W\05\EA\C6\A7\AD.llpc_version\A453.5\AEamdpal.version\92\02\03"}
!16 = !{i32 0}
Expand Down
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