https://github.com/joaosaffran created
https://github.com/llvm/llvm-project/pull/137284
None
>From 7219ed4328aff2929f021c5efbd6901bc4bd2e20 Mon Sep 17 00:00:00 2001
From: joaosaffran <joao.saff...@microsoft.com>
Date: Fri, 25 Apr 2025 05:09:08 +0000
Subject: [PATCH] refactoring mcdxbc struct to store root parameters out of
order
---
.../llvm/MC/DXContainerRootSignature.h | 138 +++++++++++++++++-
.../include/llvm/ObjectYAML/DXContainerYAML.h | 2 +-
llvm/lib/MC/DXContainerRootSignature.cpp | 78 +++++-----
llvm/lib/ObjectYAML/DXContainerEmitter.cpp | 36 ++---
llvm/lib/Target/DirectX/DXILRootSignature.cpp | 45 +++---
5 files changed, 208 insertions(+), 91 deletions(-)
diff --git a/llvm/include/llvm/MC/DXContainerRootSignature.h
b/llvm/include/llvm/MC/DXContainerRootSignature.h
index 1f421d726bf38..e1f4abbcebf8f 100644
--- a/llvm/include/llvm/MC/DXContainerRootSignature.h
+++ b/llvm/include/llvm/MC/DXContainerRootSignature.h
@@ -6,22 +6,146 @@
//
//===----------------------------------------------------------------------===//
+#include "llvm/ADT/STLForwardCompat.h"
#include "llvm/BinaryFormat/DXContainer.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <cstddef>
#include <cstdint>
-#include <limits>
+#include <variant>
namespace llvm {
class raw_ostream;
namespace mcdxbc {
+struct RootParameterHeader : public dxbc::RootParameterHeader {
+
+ size_t Location;
+
+ RootParameterHeader() = default;
+
+ RootParameterHeader(dxbc::RootParameterHeader H, size_t L)
+ : dxbc::RootParameterHeader(H), Location(L) {}
+};
+
+using RootDescriptor = std::variant<dxbc::RST0::v0::RootDescriptor,
+ dxbc::RST0::v1::RootDescriptor>;
+using ParametersView =
+ std::variant<dxbc::RootConstants, dxbc::RST0::v0::RootDescriptor,
+ dxbc::RST0::v1::RootDescriptor>;
struct RootParameter {
- dxbc::RootParameterHeader Header;
- union {
- dxbc::RootConstants Constants;
- dxbc::RST0::v0::RootDescriptor Descriptor_V10;
- dxbc::RST0::v1::RootDescriptor Descriptor_V11;
+ SmallVector<RootParameterHeader> Headers;
+
+ SmallVector<dxbc::RootConstants> Constants;
+ SmallVector<RootDescriptor> Descriptors;
+
+ void addHeader(dxbc::RootParameterHeader H, size_t L) {
+ Headers.push_back(RootParameterHeader(H, L));
+ }
+
+ void addParameter(dxbc::RootParameterHeader H, dxbc::RootConstants C) {
+ addHeader(H, Constants.size());
+ Constants.push_back(C);
+ }
+
+ void addParameter(dxbc::RootParameterHeader H,
+ dxbc::RST0::v0::RootDescriptor D) {
+ addHeader(H, Descriptors.size());
+ Descriptors.push_back(D);
+ }
+
+ void addParameter(dxbc::RootParameterHeader H,
+ dxbc::RST0::v1::RootDescriptor D) {
+ addHeader(H, Descriptors.size());
+ Descriptors.push_back(D);
+ }
+
+ ParametersView get(const RootParameterHeader &H) const {
+ switch (H.ParameterType) {
+ case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
+ return Constants[H.Location];
+ case llvm::to_underlying(dxbc::RootParameterType::CBV):
+ case llvm::to_underlying(dxbc::RootParameterType::SRV):
+ case llvm::to_underlying(dxbc::RootParameterType::UAV):
+ RootDescriptor VersionedParam = Descriptors[H.Location];
+ if (std::holds_alternative<dxbc::RST0::v0::RootDescriptor>(
+ VersionedParam))
+ return std::get<dxbc::RST0::v0::RootDescriptor>(VersionedParam);
+ return std::get<dxbc::RST0::v1::RootDescriptor>(VersionedParam);
+ }
+
+ llvm_unreachable("Unimplemented parameter type");
+ }
+
+ struct iterator {
+ const RootParameter &Parameters;
+ SmallVector<RootParameterHeader>::const_iterator Current;
+
+ // Changed parameter type to match member variable (removed const)
+ iterator(const RootParameter &P,
+ SmallVector<RootParameterHeader>::const_iterator C)
+ : Parameters(P), Current(C) {}
+ iterator(const iterator &) = default;
+
+ ParametersView operator*() {
+ ParametersView Val;
+ switch (Current->ParameterType) {
+ case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
+ Val = Parameters.Constants[Current->Location];
+ break;
+
+ case llvm::to_underlying(dxbc::RootParameterType::CBV):
+ case llvm::to_underlying(dxbc::RootParameterType::SRV):
+ case llvm::to_underlying(dxbc::RootParameterType::UAV):
+ RootDescriptor VersionedParam =
+ Parameters.Descriptors[Current->Location];
+ if (std::holds_alternative<dxbc::RST0::v0::RootDescriptor>(
+ VersionedParam))
+ Val = std::get<dxbc::RST0::v0::RootDescriptor>(VersionedParam);
+ else
+ Val = std::get<dxbc::RST0::v1::RootDescriptor>(VersionedParam);
+ break;
+ }
+ return Val;
+ }
+
+ iterator operator++() {
+ Current++;
+ return *this;
+ }
+
+ iterator operator++(int) {
+ iterator Tmp = *this;
+ ++*this;
+ return Tmp;
+ }
+
+ iterator operator--() {
+ Current--;
+ return *this;
+ }
+
+ iterator operator--(int) {
+ iterator Tmp = *this;
+ --*this;
+ return Tmp;
+ }
+
+ bool operator==(const iterator I) { return I.Current == Current; }
+ bool operator!=(const iterator I) { return !(*this == I); }
};
+
+ iterator begin() const { return iterator(*this, Headers.begin()); }
+
+ iterator end() const { return iterator(*this, Headers.end()); }
+
+ size_t size() const { return Headers.size(); }
+
+ bool isEmpty() const { return Headers.empty(); }
+
+ llvm::iterator_range<RootParameter::iterator> getAll() const {
+ return llvm::make_range(begin(), end());
+ }
};
struct RootSignatureDesc {
@@ -30,7 +154,7 @@ struct RootSignatureDesc {
uint32_t RootParameterOffset = 0U;
uint32_t StaticSamplersOffset = 0u;
uint32_t NumStaticSamplers = 0u;
- SmallVector<mcdxbc::RootParameter> Parameters;
+ mcdxbc::RootParameter Parameters;
void write(raw_ostream &OS) const;
diff --git a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
index c54c995acd263..e86a869da99bc 100644
--- a/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
+++ b/llvm/include/llvm/ObjectYAML/DXContainerYAML.h
@@ -95,7 +95,7 @@ struct RootParameterYamlDesc {
uint32_t Type;
uint32_t Visibility;
uint32_t Offset;
- RootParameterYamlDesc() {};
+ RootParameterYamlDesc(){};
RootParameterYamlDesc(uint32_t T) : Type(T) {
switch (T) {
diff --git a/llvm/lib/MC/DXContainerRootSignature.cpp
b/llvm/lib/MC/DXContainerRootSignature.cpp
index a5210f4768f16..18242ccc1e935 100644
--- a/llvm/lib/MC/DXContainerRootSignature.cpp
+++ b/llvm/lib/MC/DXContainerRootSignature.cpp
@@ -8,7 +8,9 @@
#include "llvm/MC/DXContainerRootSignature.h"
#include "llvm/ADT/SmallString.h"
+#include "llvm/BinaryFormat/DXContainer.h"
#include "llvm/Support/EndianStream.h"
+#include <variant>
using namespace llvm;
using namespace llvm::mcdxbc;
@@ -32,22 +34,15 @@ size_t RootSignatureDesc::getSize() const {
size_t Size = sizeof(dxbc::RootSignatureHeader) +
Parameters.size() * sizeof(dxbc::RootParameterHeader);
- for (const mcdxbc::RootParameter &P : Parameters) {
- switch (P.Header.ParameterType) {
- case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
- Size += sizeof(dxbc::RootConstants);
- break;
- case llvm::to_underlying(dxbc::RootParameterType::CBV):
- case llvm::to_underlying(dxbc::RootParameterType::SRV):
- case llvm::to_underlying(dxbc::RootParameterType::UAV):
- if (Version == 1)
- Size += sizeof(dxbc::RST0::v0::RootDescriptor);
- else
- Size += sizeof(dxbc::RST0::v1::RootDescriptor);
-
- break;
- }
+ for (const auto &P : Parameters) {
+ std::visit(
+ [&Size](auto &Value) -> void {
+ using T = std::decay_t<decltype(Value)>;
+ Size += sizeof(T);
+ },
+ P);
}
+
return Size;
}
@@ -66,45 +61,40 @@ void RootSignatureDesc::write(raw_ostream &OS) const {
support::endian::write(BOS, Flags, llvm::endianness::little);
SmallVector<uint32_t> ParamsOffsets;
- for (const mcdxbc::RootParameter &P : Parameters) {
- support::endian::write(BOS, P.Header.ParameterType,
- llvm::endianness::little);
- support::endian::write(BOS, P.Header.ShaderVisibility,
- llvm::endianness::little);
+ for (const auto &P : Parameters.Headers) {
+ support::endian::write(BOS, P.ParameterType, llvm::endianness::little);
+ support::endian::write(BOS, P.ShaderVisibility, llvm::endianness::little);
ParamsOffsets.push_back(writePlaceholder(BOS));
}
assert(NumParameters == ParamsOffsets.size());
- for (size_t I = 0; I < NumParameters; ++I) {
+ auto P = Parameters.begin();
+ for (size_t I = 0; I < NumParameters; ++I, P++) {
rewriteOffsetToCurrentByte(BOS, ParamsOffsets[I]);
- const mcdxbc::RootParameter &P = Parameters[I];
- switch (P.Header.ParameterType) {
- case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
- support::endian::write(BOS, P.Constants.ShaderRegister,
+ if (std::holds_alternative<dxbc::RootConstants>(*P)) {
+ auto Constants = std::get<dxbc::RootConstants>(*P);
+ support::endian::write(BOS, Constants.ShaderRegister,
+ llvm::endianness::little);
+ support::endian::write(BOS, Constants.RegisterSpace,
llvm::endianness::little);
- support::endian::write(BOS, P.Constants.RegisterSpace,
+ support::endian::write(BOS, Constants.Num32BitValues,
+ llvm::endianness::little);
+ } else if (std::holds_alternative<dxbc::RST0::v0::RootDescriptor>(*P)) {
+ auto Descriptor = std::get<dxbc::RST0::v0::RootDescriptor>(*P);
+ support::endian::write(BOS, Descriptor.ShaderRegister,
+ llvm::endianness::little);
+ support::endian::write(BOS, Descriptor.RegisterSpace,
+ llvm::endianness::little);
+ } else if (std::holds_alternative<dxbc::RST0::v1::RootDescriptor>(*P)) {
+ auto Descriptor = std::get<dxbc::RST0::v1::RootDescriptor>(*P);
+
+ support::endian::write(BOS, Descriptor.ShaderRegister,
llvm::endianness::little);
- support::endian::write(BOS, P.Constants.Num32BitValues,
+ support::endian::write(BOS, Descriptor.RegisterSpace,
llvm::endianness::little);
- break;
- case llvm::to_underlying(dxbc::RootParameterType::CBV):
- case llvm::to_underlying(dxbc::RootParameterType::SRV):
- case llvm::to_underlying(dxbc::RootParameterType::UAV):
- if (Version == 1) {
- support::endian::write(BOS, P.Descriptor_V10.ShaderRegister,
- llvm::endianness::little);
- support::endian::write(BOS, P.Descriptor_V10.RegisterSpace,
- llvm::endianness::little);
- } else {
- support::endian::write(BOS, P.Descriptor_V11.ShaderRegister,
- llvm::endianness::little);
- support::endian::write(BOS, P.Descriptor_V11.RegisterSpace,
- llvm::endianness::little);
- support::endian::write(BOS, P.Descriptor_V11.Flags,
- llvm::endianness::little);
- }
+ support::endian::write(BOS, Descriptor.Flags, llvm::endianness::little);
}
}
assert(Storage.size() == getSize());
diff --git a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
index be0e52fef04f5..8e40ff39ada36 100644
--- a/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
+++ b/llvm/lib/ObjectYAML/DXContainerEmitter.cpp
@@ -274,36 +274,38 @@ void DXContainerWriter::writeParts(raw_ostream &OS) {
RS.StaticSamplersOffset = P.RootSignature->StaticSamplersOffset;
for (const auto &Param : P.RootSignature->Parameters) {
- mcdxbc::RootParameter NewParam;
- NewParam.Header = dxbc::RootParameterHeader{
- Param.Type, Param.Visibility, Param.Offset};
+ auto Header = dxbc::RootParameterHeader{Param.Type, Param.Visibility,
+ Param.Offset};
switch (Param.Type) {
case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
- NewParam.Constants.Num32BitValues = Param.Constants.Num32BitValues;
- NewParam.Constants.RegisterSpace = Param.Constants.RegisterSpace;
- NewParam.Constants.ShaderRegister = Param.Constants.ShaderRegister;
+ dxbc::RootConstants Constants;
+ Constants.Num32BitValues = Param.Constants.Num32BitValues;
+ Constants.RegisterSpace = Param.Constants.RegisterSpace;
+ Constants.ShaderRegister = Param.Constants.ShaderRegister;
+ RS.Parameters.addParameter(Header, Constants);
break;
case llvm::to_underlying(dxbc::RootParameterType::SRV):
case llvm::to_underlying(dxbc::RootParameterType::UAV):
case llvm::to_underlying(dxbc::RootParameterType::CBV):
if (RS.Version == 1) {
- NewParam.Descriptor_V10.RegisterSpace =
- Param.Descriptor.RegisterSpace;
- NewParam.Descriptor_V10.ShaderRegister =
- Param.Descriptor.ShaderRegister;
+ dxbc::RST0::v0::RootDescriptor Descriptor;
+ Descriptor.RegisterSpace = Param.Descriptor.RegisterSpace;
+ Descriptor.ShaderRegister = Param.Descriptor.ShaderRegister;
+ RS.Parameters.addParameter(Header, Descriptor);
} else {
- NewParam.Descriptor_V11.RegisterSpace =
- Param.Descriptor.RegisterSpace;
- NewParam.Descriptor_V11.ShaderRegister =
- Param.Descriptor.ShaderRegister;
- NewParam.Descriptor_V11.Flags = Param.Descriptor.getEncodedFlags();
+ dxbc::RST0::v1::RootDescriptor Descriptor;
+ Descriptor.RegisterSpace = Param.Descriptor.RegisterSpace;
+ Descriptor.ShaderRegister = Param.Descriptor.ShaderRegister;
+ Descriptor.Flags = Param.Descriptor.getEncodedFlags();
+ RS.Parameters.addParameter(Header, Descriptor);
}
break;
+ default:
+ // Handling invalid parameter type edge case
+ RS.Parameters.addHeader(Header, -1);
}
-
- RS.Parameters.push_back(NewParam);
}
RS.write(OS);
diff --git a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
index ef299c17baf76..a2141aa1364ad 100644
--- a/llvm/lib/Target/DirectX/DXILRootSignature.cpp
+++ b/llvm/lib/Target/DirectX/DXILRootSignature.cpp
@@ -30,6 +30,7 @@
#include <cstdint>
#include <optional>
#include <utility>
+#include <variant>
using namespace llvm;
using namespace llvm::dxil;
@@ -75,31 +76,32 @@ static bool parseRootConstants(LLVMContext *Ctx,
mcdxbc::RootSignatureDesc &RSD,
if (RootConstantNode->getNumOperands() != 5)
return reportError(Ctx, "Invalid format for RootConstants Element");
- mcdxbc::RootParameter NewParameter;
- NewParameter.Header.ParameterType =
+ dxbc::RootParameterHeader Header;
+ Header.ParameterType =
llvm::to_underlying(dxbc::RootParameterType::Constants32Bit);
if (std::optional<uint32_t> Val = extractMdIntValue(RootConstantNode, 1))
- NewParameter.Header.ShaderVisibility = *Val;
+ Header.ShaderVisibility = *Val;
else
return reportError(Ctx, "Invalid value for ShaderVisibility");
+ dxbc::RootConstants Constants;
if (std::optional<uint32_t> Val = extractMdIntValue(RootConstantNode, 2))
- NewParameter.Constants.ShaderRegister = *Val;
+ Constants.ShaderRegister = *Val;
else
return reportError(Ctx, "Invalid value for ShaderRegister");
if (std::optional<uint32_t> Val = extractMdIntValue(RootConstantNode, 3))
- NewParameter.Constants.RegisterSpace = *Val;
+ Constants.RegisterSpace = *Val;
else
return reportError(Ctx, "Invalid value for RegisterSpace");
if (std::optional<uint32_t> Val = extractMdIntValue(RootConstantNode, 4))
- NewParameter.Constants.Num32BitValues = *Val;
+ Constants.Num32BitValues = *Val;
else
return reportError(Ctx, "Invalid value for Num32BitValues");
- RSD.Parameters.push_back(NewParameter);
+ RSD.Parameters.addParameter(Header, Constants);
return false;
}
@@ -164,12 +166,11 @@ static bool validate(LLVMContext *Ctx, const
mcdxbc::RootSignatureDesc &RSD) {
return reportValueError(Ctx, "RootFlags", RSD.Flags);
}
- for (const mcdxbc::RootParameter &P : RSD.Parameters) {
- if (!dxbc::isValidShaderVisibility(P.Header.ShaderVisibility))
- return reportValueError(Ctx, "ShaderVisibility",
- P.Header.ShaderVisibility);
+ for (const mcdxbc::RootParameterHeader &Header : RSD.Parameters.Headers) {
+ if (!dxbc::isValidShaderVisibility(Header.ShaderVisibility))
+ return reportValueError(Ctx, "ShaderVisibility",
Header.ShaderVisibility);
- assert(dxbc::isValidParameterType(P.Header.ParameterType) &&
+ assert(dxbc::isValidParameterType(Header.ParameterType) &&
"Invalid value for ParameterType");
}
@@ -289,20 +290,20 @@ PreservedAnalyses
RootSignatureAnalysisPrinter::run(Module &M,
<< "\n";
OS << indent(Space) << "NumParameters: " << RS.Parameters.size() << "\n";
Space++;
- for (auto const &P : RS.Parameters) {
- OS << indent(Space) << "- Parameter Type: " << P.Header.ParameterType
+ for (auto const &Header : RS.Parameters.Headers) {
+ OS << indent(Space) << "- Parameter Type: " << Header.ParameterType
<< "\n";
OS << indent(Space + 2)
- << "Shader Visibility: " << P.Header.ShaderVisibility << "\n";
- switch (P.Header.ParameterType) {
- case llvm::to_underlying(dxbc::RootParameterType::Constants32Bit):
+ << "Shader Visibility: " << Header.ShaderVisibility << "\n";
+ mcdxbc::ParametersView P = RS.Parameters.get(Header);
+ if (std::holds_alternative<dxbc::RootConstants>(P)) {
+ auto Constants = std::get<dxbc::RootConstants>(P);
+ OS << indent(Space + 2) << "Register Space: " <<
Constants.RegisterSpace
+ << "\n";
OS << indent(Space + 2)
- << "Register Space: " << P.Constants.RegisterSpace << "\n";
+ << "Shader Register: " << Constants.ShaderRegister << "\n";
OS << indent(Space + 2)
- << "Shader Register: " << P.Constants.ShaderRegister << "\n";
- OS << indent(Space + 2)
- << "Num 32 Bit Values: " << P.Constants.Num32BitValues << "\n";
- break;
+ << "Num 32 Bit Values: " << Constants.Num32BitValues << "\n";
}
}
Space--;
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