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| author | David CARLIER <devnexen@gmail.com> | 2024-03-15 04:43:47 +0000 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-03-14 21:43:47 -0700 |
| commit | 9b3edb592debc00a5c3fbf7a71f63e07d6af44be (patch) | |
| tree | b0594c3ed1e5852851a38d774a2e71725699f540 | |
| parent | 600f7f2ba28f871a7e31a69252e51e01822572cd (diff) | |
| download | llvm-9b3edb592debc00a5c3fbf7a71f63e07d6af44be.zip llvm-9b3edb592debc00a5c3fbf7a71f63e07d6af44be.tar.gz llvm-9b3edb592debc00a5c3fbf7a71f63e07d6af44be.tar.bz2 | |
release/18.x: [openmp] __kmp_x86_cpuid fix for i386/PIC builds. (#84626) (#85053)
| -rw-r--r-- | openmp/runtime/src/kmp.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/openmp/runtime/src/kmp.h b/openmp/runtime/src/kmp.h index e3a1e20..d51ec88 100644 --- a/openmp/runtime/src/kmp.h +++ b/openmp/runtime/src/kmp.h @@ -1403,9 +1403,19 @@ extern void __kmp_query_cpuid(kmp_cpuinfo_t *p); // subleaf is only needed for cache and topology discovery and can be set to // zero in most cases static inline void __kmp_x86_cpuid(int leaf, int subleaf, struct kmp_cpuid *p) { +#if KMP_ARCH_X86 && (defined(__pic__) || defined(__PIC__)) + // on i386 arch, the ebx reg. is used by pic, thus we need to preserve from + // being trashed beforehand + __asm__ __volatile__("mov %%ebx, %%edi\n" + "cpuid\n" + "xchg %%edi, %%ebx\n" + : "=a"(p->eax), "=b"(p->ebx), "=c"(p->ecx), "=d"(p->edx) + : "a"(leaf), "c"(subleaf)); +#else __asm__ __volatile__("cpuid" : "=a"(p->eax), "=b"(p->ebx), "=c"(p->ecx), "=d"(p->edx) : "a"(leaf), "c"(subleaf)); +#endif } // Load p into FPU control word static inline void __kmp_load_x87_fpu_control_word(const kmp_int16 *p) { |