diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2021-03-21 19:47:24 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-03-23 05:25:45 -0700 |
| commit | 9c89c9e9c6b59260c7745c8714b69f94784a9c13 (patch) | |
| tree | 4bc16429bd01613229df74b9ad624a4cb5b36790 /gcc | |
| parent | 6acd6692f1ac3c2ece3da36178df73e3b12c4f65 (diff) | |
| download | gcc-9c89c9e9c6b59260c7745c8714b69f94784a9c13.zip gcc-9c89c9e9c6b59260c7745c8714b69f94784a9c13.tar.gz gcc-9c89c9e9c6b59260c7745c8714b69f94784a9c13.tar.bz2 | |
x86: Add __volatile__ to __cpuid and __cpuid_count
Since CPUID instruction may return different values on hybrid core.
volatile is needed on asm statements in <cpuid.h>.
PR target/99704
* config/i386/cpuid.h (__cpuid): Add __volatile__.
(__cpuid_count): Likewise.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/i386/cpuid.h | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/gcc/config/i386/cpuid.h b/gcc/config/i386/cpuid.h index 539325d..aebc17c 100644 --- a/gcc/config/i386/cpuid.h +++ b/gcc/config/i386/cpuid.h @@ -212,28 +212,28 @@ /* At least one cpu (Winchip 2) does not set %ebx and %ecx for cpuid leaf 1. Forcibly zero the two registers before calling cpuid as a precaution. */ -#define __cpuid(level, a, b, c, d) \ - do { \ - if (__builtin_constant_p (level) && (level) != 1) \ - __asm__ ("cpuid\n\t" \ - : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ - : "0" (level)); \ - else \ - __asm__ ("cpuid\n\t" \ - : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ - : "0" (level), "1" (0), "2" (0)); \ +#define __cpuid(level, a, b, c, d) \ + do { \ + if (__builtin_constant_p (level) && (level) != 1) \ + __asm__ __volatile__ ("cpuid\n\t" \ + : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ + : "0" (level)); \ + else \ + __asm__ __volatile__ ("cpuid\n\t" \ + : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ + : "0" (level), "1" (0), "2" (0)); \ } while (0) #else -#define __cpuid(level, a, b, c, d) \ - __asm__ ("cpuid\n\t" \ - : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ - : "0" (level)) +#define __cpuid(level, a, b, c, d) \ + __asm__ __volatile__ ("cpuid\n\t" \ + : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ + : "0" (level)) #endif -#define __cpuid_count(level, count, a, b, c, d) \ - __asm__ ("cpuid\n\t" \ - : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ - : "0" (level), "2" (count)) +#define __cpuid_count(level, count, a, b, c, d) \ + __asm__ __volatile__ ("cpuid\n\t" \ + : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \ + : "0" (level), "2" (count)) /* Return highest supported input value for cpuid instruction. ext can |