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[Clang] Fix __cpuidex conflict with other offloading targets #157741

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Sep 10, 2025
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[Clang] Fix __cpuidex conflict with other offloading targets #157741

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2 changes: 1 addition & 1 deletion clang/lib/Headers/cpuid.h
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Original file line number Diff line number Diff line change
Expand Up @@ -348,7 +348,7 @@ static __inline int __get_cpuid_count (unsigned int __leaf,
// In some cases, offloading will set the host as the aux triple and define the
// builtin. Given __has_builtin does not detect builtins on aux triples, we need
// to explicitly check for some offloading cases.
#ifndef __NVPTX__
#if !defined(__NVPTX__) && !defined(__AMDGPU__) && !defined(__SPIRV__)
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Another option is to add a TARGET_OFFLOADING macro or something and check that, let me know what you prefer.

static __inline void __cpuidex(int __cpu_info[4], int __leaf, int __subleaf) {
__cpuid_count(__leaf, __subleaf, __cpu_info[0], __cpu_info[1], __cpu_info[2],
__cpu_info[3]);
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3 changes: 3 additions & 0 deletions clang/test/Headers/__cpuidex_conflict.c
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Expand Up @@ -6,6 +6,9 @@
// Ensure that we do not run into conflicts when offloading.
// RUN: %clang_cc1 %s -DIS_STATIC=static -ffreestanding -fopenmp -fopenmp-is-target-device -aux-triple x86_64-unknown-linux-gnu
// RUN: %clang_cc1 -DIS_STATIC="" -triple nvptx64-nvidia-cuda -aux-triple x86_64-unknown-linux-gnu -aux-target-cpu x86-64 -fcuda-is-device -x cuda %s -o -
// RUN: %clang_cc1 -DIS_STATIC="" -triple amdgcn-amd-amdhsa -aux-triple x86_64-unknown-linux-gnu -aux-target-cpu x86-64 -fcuda-is-device -x cuda %s -o -
// RUN: %clang_cc1 -DIS_STATIC="" -triple spirv64 -aux-triple x86_64-unknown-linux-gnu -aux-target-cpu x86-64 -fcuda-is-device -x cuda %s -o -
// RUN: %clang_cc1 -DIS_STATIC="" -triple spirv64 -aux-triple x86_64-unknown-linux-gnu -aux-target-cpu x86-64 -fsycl-is-device %s -o -

typedef __SIZE_TYPE__ size_t;

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