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[HIP][SPIRV] Enable the SPIRV backend instead of the translator through an experimental flag. #162282

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[HIP][SPIRV] Enable the SPIRV backend instead of the translator through an experimental flag. #162282

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e89ce89
[HIP][SPIRV] Enable the SPIRV backend instead of the translator throu…
mgcarrasco Oct 7, 2025
8d56d95
Switch to hip prefix for new flags.
mgcarrasco Oct 10, 2025
d69850d
Remove hip prefix.
mgcarrasco Oct 10, 2025
13d77d9
Remove "COM:".
mgcarrasco Oct 10, 2025
08b9512
Invoke the SPIRV backend directly and add -ccc-print-phases and -ccc-…
mgcarrasco Oct 16, 2025
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14 changes: 14 additions & 0 deletions clang/include/clang/Driver/Options.td
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Original file line number Diff line number Diff line change
Expand Up @@ -5483,6 +5483,20 @@ defm wavefrontsize64 : SimpleMFlag<"wavefrontsize64",
defm amdgpu_precise_memory_op
: SimpleMFlag<"amdgpu-precise-memory-op", "Enable", "Disable",
" precise memory mode (AMDGPU only)">;
def amdgpu_use_experimental_spirv_backend
: Flag<["-"], "amdgpu-use-experimental-spirv-backend">,
Group<m_amdgpu_Features_Group>,
Flags<[HelpHidden]>,
Visibility<[ClangOption]>,
HelpText<"Use experimental SPIRV backend for AMDGPU compilation (AMDGPU "
"only)">;
def no_amdgpu_use_experimental_spirv_backend
: Flag<["-"], "no-amdgpu-use-experimental-spirv-backend">,
Group<m_amdgpu_Features_Group>,
Flags<[HelpHidden]>,
Visibility<[ClangOption]>,
HelpText<"Do not use experimental SPIRV backend for AMDGPU compilation "
"(AMDGPU only)">;

def munsafe_fp_atomics : Flag<["-"], "munsafe-fp-atomics">,
Visibility<[ClangOption, CC1Option, FlangOption, FC1Option]>, Alias<fatomic_ignore_denormal_mode>;
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36 changes: 27 additions & 9 deletions clang/lib/Driver/ToolChains/HIPAMD.cpp
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Expand Up @@ -175,15 +175,33 @@ void AMDGCN::Linker::constructLinkAndEmitSpirvCommand(

constructLlvmLinkCommand(C, JA, Inputs, LinkedBCFile, Args);

// Emit SPIR-V binary.
llvm::opt::ArgStringList TrArgs{
"--spirv-max-version=1.6",
"--spirv-ext=+all",
"--spirv-allow-unknown-intrinsics",
"--spirv-lower-const-expr",
"--spirv-preserve-auxdata",
"--spirv-debug-info-version=nonsemantic-shader-200"};
SPIRV::constructTranslateCommand(C, *this, JA, Output, LinkedBCFile, TrArgs);
bool UseSPIRVBackend = Args.hasFlag(
options::OPT_amdgpu_use_experimental_spirv_backend,
options::OPT_no_amdgpu_use_experimental_spirv_backend, /*Default=*/false);

// Emit SPIR-V binary either using the SPIRV backend or the translator.
if (UseSPIRVBackend) {
llvm::opt::ArgStringList CmdArgs;
const char *Triple =
C.getArgs().MakeArgString("-triple=spirv64-amd-amdhsa");
CmdArgs.append({"-cc1", Triple, "-emit-obj", LinkedBCFile.getFilename(),
"-o", Output.getFilename()});
const char *Exec = getToolChain().getDriver().getClangProgramPath();
C.addCommand(std::make_unique<Command>(JA, *this,
ResponseFileSupport::None(), Exec,
CmdArgs, LinkedBCFile, Output));
} else {
// Use the SPIRV translator for code gen.
llvm::opt::ArgStringList TrArgs{
"--spirv-max-version=1.6",
"--spirv-ext=+all",
"--spirv-allow-unknown-intrinsics",
"--spirv-lower-const-expr",
"--spirv-preserve-auxdata",
"--spirv-debug-info-version=nonsemantic-shader-200"};
SPIRV::constructTranslateCommand(C, *this, JA, Output, LinkedBCFile,
TrArgs);
}
}

// For amdgcn the inputs of the linker job are device bitcode and output is
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12 changes: 12 additions & 0 deletions clang/test/Driver/amdgpu-spirv-backend-opt.c
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@@ -0,0 +1,12 @@
// COM: This test case validates the behavior of -amdgpu-use-experimental-spirv-backend

// COM: Test that -amdgpu-use-experimental-spirv-backend calls clang -cc1 with the SPIRV triple.
// RUN: %clang -x hip %s --cuda-device-only --offload-arch=amdgcnspirv -amdgpu-use-experimental-spirv-backend -nogpuinc -nogpulib -### 2>&1 | FileCheck %s --check-prefix=CHECK-SPIRV-BACKEND
// CHECK-SPIRV-BACKEND: "{{.*}}clang{{.*}}" "-cc1" "{{.*-triple=spirv64-amd-amdhsa}}"

// COM: Test that -no-amdgpu-use-experimental-spirv-backend calls the SPIRV translator
// RUN: %clang -x hip %s --cuda-device-only --offload-arch=amdgcnspirv -no-amdgpu-use-experimental-spirv-backend -nogpuinc -nogpulib -### 2>&1 | FileCheck %s --check-prefix=CHECK-SPIRV-TRANSLATOR
// CHECK-SPIRV-TRANSLATOR: "{{.*llvm-spirv.*}}" "{{--spirv-max-version=[0-9]+\.[0-9]}}"

// COM: Test that by default we use the translator
// RUN: %clang -x hip %s --cuda-device-only --offload-arch=amdgcnspirv -nogpuinc -nogpulib -### 2>&1 | FileCheck %s --check-prefix=CHECK-SPIRV-TRANSLATOR