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annotate src/os_timer.cpp @ 8015:7ce9b4fdf0dc draft

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(svn r11575) -Fix [FS#1502]: widget numbers of StationViewWindow were incorrect at some places
author smatz <smatz@openttd.org>
date Wed, 05 Dec 2007 16:55:33 +0000
parents 4aa2ed8e5f36
children d48433370037
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1 /* $Id$ */
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2
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3 /** @file os_timer.cpp */
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4
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5 #include "stdafx.h"
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6
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7 #undef RDTSC_AVAILABLE
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9 /* rdtsc for MSC_VER, uses simple inline assembly, or _rdtsc
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10 * from external win64.asm because VS2005 does not support inline assembly */
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11 #if defined(_MSC_VER) && !defined(RDTSC_AVAILABLE) && !defined(WINCE)
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12 # if _MSC_VER >= 1400
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13 #include <intrin.h>
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14 uint64 _rdtsc()
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15 {
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16 return __rdtsc();
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17 }
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18 # else
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19 uint64 _declspec(naked) _rdtsc()
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20 {
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21 _asm {
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22 rdtsc
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23 ret
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24 }
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25 }
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26 # endif
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27 # define RDTSC_AVAILABLE
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28 #endif
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29
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30 /* rdtsc for OS/2. Hopefully this works, who knows */
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31 #if defined (__WATCOMC__) && !defined(RDTSC_AVAILABLE)
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32 unsigned __int64 _rdtsc();
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33 # pragma aux _rdtsc = 0x0F 0x31 value [edx eax] parm nomemory modify exact [edx eax] nomemory;
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34 # define RDTSC_AVAILABLE
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35 #endif
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36
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37 /* rdtsc for all other *nix-en (hopefully). Use GCC syntax */
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38 #if defined(__i386__) || defined(__x86_64__) && !defined(RDTSC_AVAILABLE)
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39 uint64 _rdtsc()
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40 {
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41 uint32 high, low;
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42 __asm__ __volatile__ ("rdtsc" : "=a" (low), "=d" (high));
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43 return ((uint64)high << 32) | low;
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44 }
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45 # define RDTSC_AVAILABLE
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46 #endif
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47
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48 /* rdtsc for PPC which has this not */
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49 #if (defined(__POWERPC__) || defined(__powerpc__)) && !defined(RDTSC_AVAILABLE)
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50 uint64 _rdtsc()
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51 {
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52 uint32 high = 0, high2 = 0, low;
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53 /* PPC does not have rdtsc, so we cheat by reading the two 32-bit time-counters
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54 * it has, 'Move From Time Base (Upper)'. Since these are two reads, in the
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55 * very unlikely event that the lower part overflows to the upper part while we
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56 * read it; we double-check and reread the registers */
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57 asm volatile (
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58 "mftbu %0\n"
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59 "mftb %1\n"
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60 "mftbu %2\n"
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61 "cmpw %3,%4\n"
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62 "bne- $-16\n"
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63 : "=r" (high), "=r" (low), "=r" (high2)
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64 : "0" (high), "2" (high2)
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65 );
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66 return ((uint64)high << 32) | low;
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67 }
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68 # define RDTSC_AVAILABLE
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69 #endif
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70
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71 /* In all other cases we have no support for rdtsc. No major issue,
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72 * you just won't be able to profile your code with TIC()/TOC() */
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73 #if !defined(RDTSC_AVAILABLE)
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74 /* MSVC (in case of WinCE) can't handle #warning */
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75 # if !defined(_MSC_VER)
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76 #warning "(non-fatal) No support for rdtsc(), you won't be able to profile with TIC/TOC"
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77 # endif
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78 uint64 _rdtsc() {return 0;}
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79 #endif