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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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10 changes: 10 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 @@ -1421,6 +1421,16 @@ def fhip_emit_relocatable : Flag<["-"], "fhip-emit-relocatable">,
HelpText<"Compile HIP source to relocatable">;
def fno_hip_emit_relocatable : Flag<["-"], "fno-hip-emit-relocatable">,
HelpText<"Do not override toolchain to compile HIP source to relocatable">;
def use_experimental_spirv_backend
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There should be a defm helper for no variants right?

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Ty. If we don't require a member variable, then defm does not seem to be the right option (see how gpu_bundle_output and no_gpu_bundle_output are defined).

: Flag<["-"], "use-experimental-spirv-backend">,
Group<hip_Group>,
Flags<[HelpHidden]>,
HelpText<"Use experimental SPIRV backend for compilation ">;
def no_use_experimental_spirv_backend
: Flag<["-"], "no-use-experimental-spirv-backend">,
Group<hip_Group>,
Flags<[HelpHidden]>,
HelpText<"Do not use experimental SPIRV backend for compilation ">;
}

// Clang specific/exclusive options for OpenACC.
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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_use_experimental_spirv_backend,
options::OPT_no_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/hip-spirv-backend-opt.c
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@@ -0,0 +1,12 @@
// This test case validates the behavior of -use-experimental-spirv-backend

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

// Test that -no-use-experimental-spirv-backend calls the SPIRV translator
// RUN: %clang -x hip %s --cuda-device-only --offload-arch=amdgcnspirv -no-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]}}"

// 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