Darkvater@3383: /* $Id$ */
Darkvater@3383: 
Darkvater@3383: #include "stdafx.h"
Darkvater@3383: 
Darkvater@3383: #undef RDTSC_AVAILABLE
Darkvater@3383: 
Darkvater@3383: /* rdtsc for MSC_VER, uses simple inline assembly, or _rdtsc
Darkvater@3383:  * from external win64.asm because VS2005 does not support inline assembly */
Darkvater@3383: #if defined(_MSC_VER) && !defined(RDTSC_AVAILABLE)
Darkvater@3383: # if defined (_M_AMD64)
Darkvater@3383: extern uint64 _rdtsc(void);
Darkvater@3383: #	else
Darkvater@3383: uint64 _declspec(naked) _rdtsc(void)
Darkvater@3383: {
Darkvater@3383: 	_asm {
Darkvater@3383: 		rdtsc
Darkvater@3383: 		ret
Darkvater@3383: 	}
Darkvater@3383: }
Darkvater@3383: # endif
Darkvater@3383: # define RDTSC_AVAILABLE
Darkvater@3383: #endif
Darkvater@3383: 
Darkvater@3383: /* rdtsc for OS/2. Hopefully this works, who knows */
Darkvater@3383: #if defined (__WATCOMC__) && !defined(RDTSC_AVAILABLE)
Darkvater@3383: unsigned __int64 _rdtsc( void);
Darkvater@3383: # pragma aux _rdtsc = 0x0F 0x31 value [edx eax] parm nomemory modify exact [edx eax] nomemory;
Darkvater@3383: # define RDTSC_AVAILABLE
Darkvater@3383: #endif
Darkvater@3383: 
Darkvater@3383: /* rdtsc for all other *nix-en (hopefully). Use GCC syntax */
Darkvater@3383: #if defined(__i386__) || defined(__x86_64__) && !defined(RDTSC_AVAILABLE)
Darkvater@3383: uint64 _rdtsc(void)
Darkvater@3383: {
Darkvater@3383: 	uint32 high, low;
Darkvater@3383: 	__asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high));
Darkvater@3383: 	return ((uint64)high << 32) | low;
Darkvater@3383: }
Darkvater@3383: # define RDTSC_AVAILABLE
Darkvater@3383: #endif
Darkvater@3383: 
Darkvater@3383: /* rdtsc for PPC which has this not */
Darkvater@5551: #if (defined(__POWERPC__) || defined(__powerpc__)) && !defined(RDTSC_AVAILABLE)
Darkvater@3383: uint64 _rdtsc(void)
Darkvater@3383: {
Darkvater@3383: 	uint32 high = 0, high2 = 0, low;
Darkvater@3383: 	/* PPC does not have rdtsc, so we cheat by reading the two 32-bit time-counters
Darkvater@3383: 	 * it has, 'Move From Time Base (Upper)'. Since these are two reads, in the
Darkvater@3383: 	 * very unlikely event that the lower part overflows to the upper part while we
Darkvater@3383: 	 * read it; we double-check and reread the registers */
Darkvater@3383: 	asm volatile (
Darkvater@3383: 				  "mftbu %0\n"
Darkvater@3383: 				  "mftb %1\n"
Darkvater@3383: 				  "mftbu %2\n"
Darkvater@3383: 				  "cmpw %3,%4\n"
Darkvater@3383: 				  "bne- $-16\n"
Darkvater@3383: 				  : "=r" (high), "=r" (low), "=r" (high2)
Darkvater@3383: 				  : "0" (high), "2" (high2)
Darkvater@3383: 				  );
Darkvater@3383: 	return ((uint64)high << 32) | low;
Darkvater@3383: }
Darkvater@3383: # define RDTSC_AVAILABLE
Darkvater@3383: #endif
Darkvater@3383: 
Darkvater@3383: /* In all other cases we have no support for rdtsc. No major issue,
Darkvater@3383:  * you just won't be able to profile your code with TIC()/TOC() */
Darkvater@3383: #if !defined(RDTSC_AVAILABLE)
Darkvater@3407: #warning "(non-fatal) No support for rdtsc(), you won't be able to profile with TIC/TOC"
Darkvater@3383: uint64 _rdtsc(void) {return 0;}
Darkvater@3383: #endif