1/* 2 * Mesa 3-D graphics library 3 * Version: 6.1 4 * 5 * Copyright (C) 1999-2004 Brian Paul All Rights Reserved. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the "Software"), 9 * to deal in the Software without restriction, including without limitation 10 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 11 * and/or sell copies of the Software, and to permit persons to whom the 12 * Software is furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included 15 * in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN 21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: 25 * Gareth Hughes 26 */ 27 28#ifndef __M_DEBUG_UTIL_H__ 29#define __M_DEBUG_UTIL_H__ 30 31 32#ifdef DEBUG_MATH /* This code only used for debugging */ 33 34 35/* Comment this out to deactivate the cycle counter. 36 * NOTE: it works only on CPUs which know the 'rdtsc' command (586 or higher) 37 * (hope, you don't try to debug Mesa on a 386 ;) 38 */ 39#if defined(__GNUC__) && \ 40 ((defined(__i386__) && defined(USE_X86_ASM)) || \ 41 (defined(__sparc__) && defined(USE_SPARC_ASM))) 42#define RUN_DEBUG_BENCHMARK 43#endif 44 45#define TEST_COUNT 128 /* size of the tested vector array */ 46 47#define REQUIRED_PRECISION 10 /* allow 4 bits to miss */ 48#define MAX_PRECISION 24 /* max. precision possible */ 49 50 51#ifdef RUN_DEBUG_BENCHMARK 52/* Overhead of profiling counter in cycles. Automatically adjusted to 53 * your machine at run time - counter initialization should give very 54 * consistent results. 55 */ 56extern long counter_overhead; 57 58/* This is the value of the environment variable MESA_PROFILE, and is 59 * used to determine if we should benchmark the functions as well as 60 * verify their correctness. 61 */ 62extern char *mesa_profile; 63 64/* Modify the number of tests if you like. 65 * We take the minimum of all results, because every error should be 66 * positive (time used by other processes, task switches etc). 67 * It is assumed that all calculations are done in the cache. 68 */ 69 70#if defined(__i386__) 71 72#if 1 /* PPro, PII, PIII version */ 73 74/* Profiling on the P6 architecture requires a little more work, due to 75 * the internal out-of-order execution. We must perform a serializing 76 * 'cpuid' instruction before and after the 'rdtsc' instructions to make 77 * sure no other uops are executed when we sample the timestamp counter. 78 */ 79#define INIT_COUNTER() \ 80 do { \ 81 int cycle_i; \ 82 counter_overhead = LONG_MAX; \ 83 for ( cycle_i = 0 ; cycle_i < 8 ; cycle_i++ ) { \ 84 long cycle_tmp1 = 0, cycle_tmp2 = 0; \ 85 __asm__ __volatile__ ( "push %%ebx \n" \ 86 "xor %%eax, %%eax \n" \ 87 "cpuid \n" \ 88 "rdtsc \n" \ 89 "mov %%eax, %0 \n" \ 90 "xor %%eax, %%eax \n" \ 91 "cpuid \n" \ 92 "pop %%ebx \n" \ 93 "push %%ebx \n" \ 94 "xor %%eax, %%eax \n" \ 95 "cpuid \n" \ 96 "rdtsc \n" \ 97 "mov %%eax, %1 \n" \ 98 "xor %%eax, %%eax \n" \ 99 "cpuid \n" \ 100 "pop %%ebx \n" \ 101 : "=m" (cycle_tmp1), "=m" (cycle_tmp2) \ 102 : : "eax", "ecx", "edx" ); \ 103 if ( counter_overhead > (cycle_tmp2 - cycle_tmp1) ) { \ 104 counter_overhead = cycle_tmp2 - cycle_tmp1; \ 105 } \ 106 } \ 107 } while (0) 108 109#define BEGIN_RACE(x) \ 110 x = LONG_MAX; \ 111 for ( cycle_i = 0 ; cycle_i < 10 ; cycle_i++ ) { \ 112 long cycle_tmp1 = 0, cycle_tmp2 = 0; \ 113 __asm__ __volatile__ ( "push %%ebx \n" \ 114 "xor %%eax, %%eax \n" \ 115 "cpuid \n" \ 116 "rdtsc \n" \ 117 "mov %%eax, %0 \n" \ 118 "xor %%eax, %%eax \n" \ 119 "cpuid \n" \ 120 "pop %%ebx \n" \ 121 : "=m" (cycle_tmp1) \ 122 : : "eax", "ecx", "edx" ); 123 124#define END_RACE(x) \ 125 __asm__ __volatile__ ( "push %%ebx \n" \ 126 "xor %%eax, %%eax \n" \ 127 "cpuid \n" \ 128 "rdtsc \n" \ 129 "mov %%eax, %0 \n" \ 130 "xor %%eax, %%eax \n" \ 131 "cpuid \n" \ 132 "pop %%ebx \n" \ 133 : "=m" (cycle_tmp2) \ 134 : : "eax", "ecx", "edx" ); \ 135 if ( x > (cycle_tmp2 - cycle_tmp1) ) { \ 136 x = cycle_tmp2 - cycle_tmp1; \ 137 } \ 138 } \ 139 x -= counter_overhead; 140 141#else /* PPlain, PMMX version */ 142 143/* To ensure accurate results, we stall the pipelines with the 144 * non-pairable 'cdq' instruction. This ensures all the code being 145 * profiled is complete when the 'rdtsc' instruction executes. 146 */ 147#define INIT_COUNTER(x) \ 148 do { \ 149 int cycle_i; \ 150 x = LONG_MAX; \ 151 for ( cycle_i = 0 ; cycle_i < 32 ; cycle_i++ ) { \ 152 long cycle_tmp1, cycle_tmp2, dummy; \ 153 __asm__ ( "mov %%eax, %0" : "=a" (cycle_tmp1) ); \ 154 __asm__ ( "mov %%eax, %0" : "=a" (cycle_tmp2) ); \ 155 __asm__ ( "cdq" ); \ 156 __asm__ ( "cdq" ); \ 157 __asm__ ( "rdtsc" : "=a" (cycle_tmp1), "=d" (dummy) ); \ 158 __asm__ ( "cdq" ); \ 159 __asm__ ( "cdq" ); \ 160 __asm__ ( "rdtsc" : "=a" (cycle_tmp2), "=d" (dummy) ); \ 161 if ( x > (cycle_tmp2 - cycle_tmp1) ) \ 162 x = cycle_tmp2 - cycle_tmp1; \ 163 } \ 164 } while (0) 165 166#define BEGIN_RACE(x) \ 167 x = LONG_MAX; \ 168 for ( cycle_i = 0 ; cycle_i < 16 ; cycle_i++ ) { \ 169 long cycle_tmp1, cycle_tmp2, dummy; \ 170 __asm__ ( "mov %%eax, %0" : "=a" (cycle_tmp1) ); \ 171 __asm__ ( "mov %%eax, %0" : "=a" (cycle_tmp2) ); \ 172 __asm__ ( "cdq" ); \ 173 __asm__ ( "cdq" ); \ 174 __asm__ ( "rdtsc" : "=a" (cycle_tmp1), "=d" (dummy) ); 175 176 177#define END_RACE(x) \ 178 __asm__ ( "cdq" ); \ 179 __asm__ ( "cdq" ); \ 180 __asm__ ( "rdtsc" : "=a" (cycle_tmp2), "=d" (dummy) ); \ 181 if ( x > (cycle_tmp2 - cycle_tmp1) ) \ 182 x = cycle_tmp2 - cycle_tmp1; \ 183 } \ 184 x -= counter_overhead; 185 186#endif 187 188#elif defined(__x86_64__) 189 190#define rdtscll(val) do { \ 191 unsigned int a,d; \ 192 __asm__ volatile("rdtsc" : "=a" (a), "=d" (d)); \ 193 (val) = ((unsigned long)a) | (((unsigned long)d)<<32); \ 194} while(0) 195 196/* Copied from i386 PIII version */ 197#define INIT_COUNTER() \ 198 do { \ 199 int cycle_i; \ 200 counter_overhead = LONG_MAX; \ 201 for ( cycle_i = 0 ; cycle_i < 16 ; cycle_i++ ) { \ 202 unsigned long cycle_tmp1, cycle_tmp2; \ 203 rdtscll(cycle_tmp1); \ 204 rdtscll(cycle_tmp2); \ 205 if ( counter_overhead > (cycle_tmp2 - cycle_tmp1) ) { \ 206 counter_overhead = cycle_tmp2 - cycle_tmp1; \ 207 } \ 208 } \ 209 } while (0) 210 211 212#define BEGIN_RACE(x) \ 213 x = LONG_MAX; \ 214 for ( cycle_i = 0 ; cycle_i < 10 ; cycle_i++ ) { \ 215 unsigned long cycle_tmp1, cycle_tmp2; \ 216 rdtscll(cycle_tmp1); \ 217 218#define END_RACE(x) \ 219 rdtscll(cycle_tmp2); \ 220 if ( x > (cycle_tmp2 - cycle_tmp1) ) { \ 221 x = cycle_tmp2 - cycle_tmp1; \ 222 } \ 223 } \ 224 x -= counter_overhead; 225 226#elif defined(__sparc__) 227 228#define INIT_COUNTER() \ 229 do { counter_overhead = 5; } while(0) 230 231#define BEGIN_RACE(x) \ 232x = LONG_MAX; \ 233for (cycle_i = 0; cycle_i <10; cycle_i++) { \ 234 register long cycle_tmp1 __asm__("l0"); \ 235 register long cycle_tmp2 __asm__("l1"); \ 236 /* rd %tick, %l0 */ \ 237 __asm__ __volatile__ (".word 0xa1410000" : "=r" (cycle_tmp1)); /* save timestamp */ 238 239#define END_RACE(x) \ 240 /* rd %tick, %l1 */ \ 241 __asm__ __volatile__ (".word 0xa3410000" : "=r" (cycle_tmp2)); \ 242 if (x > (cycle_tmp2-cycle_tmp1)) x = cycle_tmp2 - cycle_tmp1; \ 243} \ 244x -= counter_overhead; 245 246#else 247#error Your processor is not supported for RUN_XFORM_BENCHMARK 248#endif 249 250#else 251 252#define BEGIN_RACE(x) 253#define END_RACE(x) 254 255#endif 256 257 258/* ============================================================= 259 * Helper functions 260 */ 261 262static GLfloat rnd( void ) 263{ 264 GLfloat f = (GLfloat)rand() / (GLfloat)RAND_MAX; 265 GLfloat gran = (GLfloat)(1 << 13); 266 267 f = (GLfloat)(GLint)(f * gran) / gran; 268 269 return f * 2.0 - 1.0; 270} 271 272static int significand_match( GLfloat a, GLfloat b ) 273{ 274 GLfloat d = a - b; 275 int a_ex, b_ex, d_ex; 276 277 if ( d == 0.0F ) { 278 return MAX_PRECISION; /* Exact match */ 279 } 280 281 if ( a == 0.0F || b == 0.0F ) { 282 /* It would probably be better to check if the 283 * non-zero number is denormalized and return 284 * the index of the highest set bit here. 285 */ 286 return 0; 287 } 288 289 FREXPF( a, &a_ex ); 290 FREXPF( b, &b_ex ); 291 FREXPF( d, &d_ex ); 292 293 if ( a_ex < b_ex ) { 294 return a_ex - d_ex; 295 } else { 296 return b_ex - d_ex; 297 } 298} 299 300enum { NIL = 0, ONE = 1, NEG = -1, VAR = 2 }; 301 302/* Ensure our arrays are correctly aligned. 303 */ 304#if defined(__GNUC__) 305# define ALIGN16(type, array) type array __attribute__ ((aligned (16))) 306#elif defined(_MSC_VER) 307# define ALIGN16(type, array) type array __declspec(align(16)) /* GH: Does this work? */ 308#elif defined(__WATCOMC__) 309# define ALIGN16(type, array) /* Watcom does not support this */ 310#elif defined(__xlC__) 311# define ALIGN16(type, array) type __align (16) array 312#else 313# warning "ALIGN16 will not 16-byte align!\n" 314# define ALIGN16 315#endif 316 317 318#endif /* DEBUG_MATH */ 319 320#endif /* __M_DEBUG_UTIL_H__ */ 321