projects / thirdparty / squid.git / blame
| Commit | Line | Data |
|---|---|---|
| 25f98340 AJ |
1 | #ifndef _PROFILER_GET_TICK_H_ |
| 2 | #define _PROFILER_GET_TICK_H_ | |
| 3 | ||
| 25f98340 AJ |
4 | #if USE_XPROF_STATS |
| 5 | ||
| 6 | #if !_SQUID_SOLARIS_ | |
| 7 | typedef int64_t hrtime_t; | |
| 8 | #endif | |
| 9 | ||
| 10 | #if defined(__GNUC__) && ( defined(__i386) || defined(__i386__) ) | |
| 11 | static inline hrtime_t | |
| 12 | get_tick(void) | |
| 13 | { | |
| 14 | hrtime_t regs; | |
| 15 | ||
| 16 | asm volatile ("rdtsc":"=A" (regs)); | |
| 17 | return regs; | |
| 18 | /* We need return value, we rely on CC to optimise out needless subf calls */ | |
| 19 | /* Note that "rdtsc" is relatively slow OP and stalls the CPU pipes, so use it wisely */ | |
| 20 | } | |
| 21 | ||
| 22 | #elif defined(__GNUC__) && ( defined(__x86_64) || defined(__x86_64__) ) | |
| 23 | static inline hrtime_t | |
| 24 | get_tick(void) | |
| 25 | { | |
| 26 | uint32_t lo, hi; | |
| 27 | // Based on an example in Wikipedia | |
| 28 | /* We cannot use "=A", since this would use %rax on x86_64 */ | |
| 29 | asm volatile ("rdtsc" : "=a" (lo), "=d" (hi)); | |
| 30 | return (hrtime_t)hi << 32 | lo; | |
| 31 | } | |
| 32 | ||
| 33 | #elif defined(__GNUC__) && defined(__alpha) | |
| 34 | static inline hrtime_t | |
| 35 | get_tick(void) | |
| 36 | { | |
| 37 | hrtime_t regs; | |
| 38 | ||
| 39 | asm volatile ("rpcc %0" : "=r" (regs)); | |
| 40 | return regs; | |
| 41 | } | |
| 42 | ||
| 43 | #elif defined(_M_IX86) && defined(_MSC_VER) /* x86 platform on Microsoft C Compiler ONLY */ | |
| 44 | static __inline hrtime_t | |
| 45 | get_tick(void) | |
| 46 | { | |
| 47 | hrtime_t regs; | |
| 48 | ||
| 49 | __asm { | |
| 50 | cpuid | |
| 51 | rdtsc | |
| 52 | mov eax,DWORD PTR regs[0] | |
| 53 | mov edx,DWORD PTR regs[4] | |
| 54 | } | |
| 55 | return regs; | |
| 56 | } | |
| 57 | ||
| 58 | #else | |
| 59 | /* This CPU is unsupported. Short-circuit, no profiling here */ | |
| 60 | #define get_tick() 0 | |
| 61 | #undef USE_XPROF_STATS | |
| 62 | #define USE_XPROF_STATS 0 | |
| 63 | #endif | |
| 64 | ||
| 65 | #endif /* USE_XPROF_STATS */ | |
| 66 | #endif /* _PROFILING_H_ */ |