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[Clang] Add standalone AMDGPU SPIR-V toolchain #144576

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Merged
merged 1 commit into from
Jun 19, 2025
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[Clang] Add standalone AMDGPU SPIR-V toolchain #144576

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16 changes: 11 additions & 5 deletions clang/lib/Driver/Driver.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6849,11 +6849,17 @@ const ToolChain &Driver::getToolChain(const ArgList &Args,
TC = std::make_unique<toolchains::NVPTXToolChain>(*this, Target, Args);
break;
case llvm::Triple::AMDHSA: {
bool DL =
usesInput(Args, types::isOpenCL) || usesInput(Args, types::isLLVMIR);
TC = DL ? std::make_unique<toolchains::ROCMToolChain>(*this, Target, Args)
: std::make_unique<toolchains::AMDGPUToolChain>(*this, Target,
Args);
if (Target.getArch() == llvm::Triple::spirv64) {
TC = std::make_unique<toolchains::SPIRVAMDToolChain>(*this, Target,
Args);
} else {
bool DL = usesInput(Args, types::isOpenCL) ||
usesInput(Args, types::isLLVMIR);
TC = DL ? std::make_unique<toolchains::ROCMToolChain>(*this, Target,
Args)
: std::make_unique<toolchains::AMDGPUToolChain>(*this, Target,
Args);
}
break;
}
case llvm::Triple::AMDPAL:
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12 changes: 12 additions & 0 deletions clang/lib/Driver/ToolChains/HIPAMD.cpp
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Expand Up @@ -417,3 +417,15 @@ void HIPAMDToolChain::checkTargetID(
getDriver().Diag(clang::diag::err_drv_bad_target_id)
<< *PTID.OptionalTargetID;
}

SPIRVAMDToolChain::SPIRVAMDToolChain(const Driver &D,
const llvm::Triple &Triple,
const ArgList &Args)
: ROCMToolChain(D, Triple, Args) {
getProgramPaths().push_back(getDriver().Dir);
}

Tool *SPIRVAMDToolChain::buildLinker() const {
assert(getTriple().getArch() == llvm::Triple::spirv64);
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It looks like we use SPIRVAMDToolChain for spirv32 or spirv64 but we assert it's spirv64 here. Can spirv32 never hit this?

Should we add a spirv32 test case?

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32-bit SPIR-V isn't supported by AMD as far as I know, maybe @AlexVlx can clarify. Definitely shouldn't be creating the toolchain.

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assert will do nothing w/o assertion enabled. if it definitely shouldn't be creating the toolchain, probably do a llvm_unreachable?

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llvm_unreachable will also do nothing without asserts enabled

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This is copied from elsewhere, and is mostly just a sanity check since it's impossible to hit this code path with 32-bit triples.

return new tools::AMDGCN::Linker(*this);
}
9 changes: 9 additions & 0 deletions clang/lib/Driver/ToolChains/HIPAMD.h
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Expand Up @@ -97,6 +97,15 @@ class LLVM_LIBRARY_VISIBILITY HIPAMDToolChain final : public ROCMToolChain {
Tool *buildLinker() const override;
};

class LLVM_LIBRARY_VISIBILITY SPIRVAMDToolChain final : public ROCMToolChain {
public:
SPIRVAMDToolChain(const Driver &D, const llvm::Triple &Triple,
const llvm::opt::ArgList &Args);

protected:
Tool *buildLinker() const override;
};

} // end namespace toolchains
} // end namespace driver
} // end namespace clang
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19 changes: 19 additions & 0 deletions clang/test/Driver/spirv-amd-toolchain.c
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@@ -0,0 +1,19 @@
// RUN: %clang -### -ccc-print-phases --target=spirv64-amd-amdhsa %s 2>&1 \
// RUN: | FileCheck %s --check-prefix=PHASES
// PHASES: 0: input, "[[INPUT:.+]]", c
// PHASES: 1: preprocessor, {0}, cpp-output
// PHASES: 2: compiler, {1}, ir
// PHASES: 3: backend, {2}, assembler
// PHASES: 4: assembler, {3}, object
// PHASES: 5: linker, {4}, image

// RUN: %clang -### -ccc-print-bindings --target=spirv64-amd-amdhsa %s 2>&1 \
// RUN: | FileCheck %s --check-prefix=BINDINGS
// BINDINGS: # "spirv64-amd-amdhsa" - "clang", inputs: ["[[INPUT:.+]]"], output: "[[OUTPUT:.+]]"
// BINDINGS: # "spirv64-amd-amdhsa" - "AMDGCN::Linker", inputs: ["[[OUTPUT]]"], output: "a.out"

// RUN: %clang -### --target=spirv64-amd-amdhsa %s -nogpulib -nogpuinc 2>&1 \
// RUN: | FileCheck %s --check-prefix=INVOCATION
// INVOCATION: "-cc1" "-triple" "spirv64-amd-amdhsa" {{.*}} "-o" "[[OUTPUT:.+]]" "-x" "c"
// INVOCATION: "{{.*}}llvm-link" "-o" "a.out" "[[OUTPUT]]"
// INVOCATION: "{{.*}}llvm-spirv" "--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" "a.out" "-o" "a.out"
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