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/*
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** 2008 May 27
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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******************************************************************************
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**
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** This file contains inline asm code for retrieving "high-performance"
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** counters for x86 class CPUs.
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**
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** $Id: hwtime.h,v 1.3 2008/08/01 14:33:15 shane Exp $
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*/
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#ifndef _HWTIME_H_
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#define _HWTIME_H_
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/*
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** The following routine only works on pentium-class (or newer) processors.
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** It uses the RDTSC opcode to read the cycle count value out of the
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** processor and returns that value. This can be used for high-res
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** profiling.
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*/
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#if (defined(__GNUC__) || defined(_MSC_VER)) && \
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(defined(i386) || defined(__i386__) || defined(_M_IX86))
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#if defined(__GNUC__)
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__inline__ sqlite_uint64 sqlite3Hwtime(void){
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unsigned int lo, hi;
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__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
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return (sqlite_uint64)hi << 32 | lo;
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}
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#elif defined(_MSC_VER)
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__declspec(naked) __inline sqlite_uint64 __cdecl sqlite3Hwtime(void){
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__asm {
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rdtsc
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ret ; return value at EDX:EAX
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}
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}
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#endif
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#elif (defined(__GNUC__) && defined(__x86_64__))
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__inline__ sqlite_uint64 sqlite3Hwtime(void){
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unsigned long val;
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__asm__ __volatile__ ("rdtsc" : "=A" (val));
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return val;
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}
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#elif (defined(__GNUC__) && defined(__ppc__))
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__inline__ sqlite_uint64 sqlite3Hwtime(void){
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unsigned long long retval;
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unsigned long junk;
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__asm__ __volatile__ ("\n\
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1: mftbu %1\n\
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mftb %L0\n\
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mftbu %0\n\
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cmpw %0,%1\n\
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bne 1b"
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: "=r" (retval), "=r" (junk));
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return retval;
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}
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#else
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#error Need implementation of sqlite3Hwtime() for your platform.
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/*
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** To compile without implementing sqlite3Hwtime() for your platform,
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** you can remove the above #error and use the following
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** stub function. You will lose timing support for many
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** of the debugging and testing utilities, but it should at
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** least compile and run.
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*/
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sqlite_uint64 sqlite3Hwtime(void){ return ((sqlite_uint64)0); }
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#endif
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#endif /* !defined(_HWTIME_H_) */
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