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Location: cpp/openttd-patchpack/source/src/os_timer.cpp

r7921:8e674055514f 2.1 KiB text/x-c Show Annotation Show as Raw Download as Raw

belugas

(svn r11474) -Feature: Allow to resize on creation the smallmap gui in order to show all the types industry available.
-Feature: Allow to enable/disable individually or all at once, the industries shown on small map.
This will permit to easily find those that are of some interest for the player.
Heavily based on gule's patch

/* $Id$ */

/** @file os_timer.cpp */

#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) && !defined(WINCE)
# if _MSC_VER >= 1400
#include <intrin.h>
uint64 _rdtsc()
{
	return __rdtsc();
}
#	else
uint64 _declspec(naked) _rdtsc()
{
	_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();
# 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()
{
	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(__powerpc__)) && !defined(RDTSC_AVAILABLE)
uint64 _rdtsc()
{
	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)
/* MSVC (in case of WinCE) can't handle #warning */
# if !defined(_MSC_VER)
#warning "(non-fatal) No support for rdtsc(), you won't be able to profile with TIC/TOC"
# endif
uint64 _rdtsc() {return 0;}
#endif