diff options
author | rubidium <rubidium@openttd.org> | 2014-01-02 08:45:28 +0000 |
---|---|---|
committer | rubidium <rubidium@openttd.org> | 2014-01-02 08:45:28 +0000 |
commit | 59ff2836d491da97818d37d8ddfe841e0427381a (patch) | |
tree | 9311cd8fd043d4f1d219ec9d5a9067c94ad2bf36 /src/cpu.cpp | |
parent | 6b3c1aa036553494a91acb27f177afa3f6ff013f (diff) | |
download | openttd-59ff2836d491da97818d37d8ddfe841e0427381a.tar.xz |
(svn r26195) -Codechange: move debug's ottd_rdtsc (CPU specific high precision timer) into cpu.h/cpp
Diffstat (limited to 'src/cpu.cpp')
-rw-r--r-- | src/cpu.cpp | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/src/cpu.cpp b/src/cpu.cpp new file mode 100644 index 000000000..a5715b829 --- /dev/null +++ b/src/cpu.cpp @@ -0,0 +1,76 @@ +/* $Id$ */ + +/* + * This file is part of OpenTTD. + * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2. + * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>. + */ + +/** @file cpu.cpp OS/CPU/compiler dependant real time tick sampling. */ + +#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) +#include <intrin.h> +uint64 ottd_rdtsc() +{ + return __rdtsc(); +} +#define RDTSC_AVAILABLE +#endif + +/* rdtsc for OS/2. Hopefully this works, who knows */ +#if defined (__WATCOMC__) && !defined(RDTSC_AVAILABLE) +unsigned __int64 ottd_rdtsc(); +# pragma aux ottd_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(__DJGPP__) && !defined(RDTSC_AVAILABLE) +uint64 ottd_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 ottd_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 ottd_rdtsc() {return 0;} +#endif |