diff options
| -rw-r--r-- | os_timer.c | 138 |
1 files changed, 70 insertions, 68 deletions
diff --git a/os_timer.c b/os_timer.c index 2c40f5bfd..03a99f7aa 100644 --- a/os_timer.c +++ b/os_timer.c @@ -1,68 +1,70 @@ -#include "stdafx.h"
-
-#undef RDTSC_AVAILABLE
-
-/* rdtsc for MSC_VER, uses simple inline assembly, or _rdtsc
- * from external win64.asm because VS2005 does not support inline assembly */
-#if defined(_MSC_VER) && !defined(RDTSC_AVAILABLE)
-# if defined (_M_AMD64)
-extern uint64 _rdtsc(void);
-# else
-uint64 _declspec(naked) _rdtsc(void)
-{
- _asm {
- rdtsc
- ret
- }
-}
-# endif
-# define RDTSC_AVAILABLE
-#endif
-
-/* rdtsc for OS/2. Hopefully this works, who knows */
-#if defined (__WATCOMC__) && !defined(RDTSC_AVAILABLE)
-unsigned __int64 _rdtsc( void);
-# pragma aux _rdtsc = 0x0F 0x31 value [edx eax] parm nomemory modify exact [edx eax] nomemory;
-# define RDTSC_AVAILABLE
-#endif
-
-/* rdtsc for all other *nix-en (hopefully). Use GCC syntax */
-#if defined(__i386__) || defined(__x86_64__) && !defined(RDTSC_AVAILABLE)
-uint64 _rdtsc(void)
-{
- uint32 high, low;
- __asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high));
- return ((uint64)high << 32) | low;
-}
-# define RDTSC_AVAILABLE
-#endif
-
-/* rdtsc for PPC which has this not */
-#if defined(__POWERPC__) && !defined(RDTSC_AVAILABLE)
-uint64 _rdtsc(void)
-{
- uint32 high = 0, high2 = 0, low;
- /* PPC does not have rdtsc, so we cheat by reading the two 32-bit time-counters
- * it has, 'Move From Time Base (Upper)'. Since these are two reads, in the
- * very unlikely event that the lower part overflows to the upper part while we
- * read it; we double-check and reread the registers */
- asm volatile (
- "mftbu %0\n"
- "mftb %1\n"
- "mftbu %2\n"
- "cmpw %3,%4\n"
- "bne- $-16\n"
- : "=r" (high), "=r" (low), "=r" (high2)
- : "0" (high), "2" (high2)
- );
- return ((uint64)high << 32) | low;
-}
-# define RDTSC_AVAILABLE
-#endif
-
-/* In all other cases we have no support for rdtsc. No major issue,
- * you just won't be able to profile your code with TIC()/TOC() */
-#if !defined(RDTSC_AVAILABLE)
-#warning "OS has no support for rdtsc()"
-uint64 _rdtsc(void) {return 0;}
-#endif
+/* $Id$ */ + +#include "stdafx.h" + +#undef RDTSC_AVAILABLE + +/* rdtsc for MSC_VER, uses simple inline assembly, or _rdtsc + * from external win64.asm because VS2005 does not support inline assembly */ +#if defined(_MSC_VER) && !defined(RDTSC_AVAILABLE) +# if defined (_M_AMD64) +extern uint64 _rdtsc(void); +# else +uint64 _declspec(naked) _rdtsc(void) +{ + _asm { + rdtsc + ret + } +} +# endif +# define RDTSC_AVAILABLE +#endif + +/* rdtsc for OS/2. Hopefully this works, who knows */ +#if defined (__WATCOMC__) && !defined(RDTSC_AVAILABLE) +unsigned __int64 _rdtsc( void); +# pragma aux _rdtsc = 0x0F 0x31 value [edx eax] parm nomemory modify exact [edx eax] nomemory; +# define RDTSC_AVAILABLE +#endif + +/* rdtsc for all other *nix-en (hopefully). Use GCC syntax */ +#if defined(__i386__) || defined(__x86_64__) && !defined(RDTSC_AVAILABLE) +uint64 _rdtsc(void) +{ + uint32 high, low; + __asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high)); + return ((uint64)high << 32) | low; +} +# define RDTSC_AVAILABLE +#endif + +/* rdtsc for PPC which has this not */ +#if defined(__POWERPC__) && !defined(RDTSC_AVAILABLE) +uint64 _rdtsc(void) +{ + uint32 high = 0, high2 = 0, low; + /* PPC does not have rdtsc, so we cheat by reading the two 32-bit time-counters + * it has, 'Move From Time Base (Upper)'. Since these are two reads, in the + * very unlikely event that the lower part overflows to the upper part while we + * read it; we double-check and reread the registers */ + asm volatile ( + "mftbu %0\n" + "mftb %1\n" + "mftbu %2\n" + "cmpw %3,%4\n" + "bne- $-16\n" + : "=r" (high), "=r" (low), "=r" (high2) + : "0" (high), "2" (high2) + ); + return ((uint64)high << 32) | low; +} +# define RDTSC_AVAILABLE +#endif + +/* In all other cases we have no support for rdtsc. No major issue, + * you just won't be able to profile your code with TIC()/TOC() */ +#if !defined(RDTSC_AVAILABLE) +#warning "OS has no support for rdtsc()" +uint64 _rdtsc(void) {return 0;} +#endif |