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bit_scan_test.c
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/* $Id$
*
* test bit_scan operations from bit_scan.h
* (both for correctness and speed)
*
* Copyright (C) 2007 iptelorg GmbH
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Example gcc command line:
* gcc -O9 -Wall -DCC_GCC_LIKE_ASM -D__CPU_x86 bit_scan_test.c ../bit_scan.c
* -o bit_scan_test
*
* History:
* --------
* 2007-06-23 created by andrei
*/
#include <stdlib.h>
#include <stdio.h>
#define BIT_SCAN_DEBRUIJN
#define BIT_SCAN_BRANCH
#define BIT_SCAN_SLOW
#include "../bit_scan.h"
#ifdef NO_PROFILE
#define profile_init(x,y) do{}while(0)
#define profile_start(x) do{}while(0)
#define profile_end(x) do{}while(0)
#define PROFILE_PRINT(x) do{}while(0)
#else
#include "profile.h"
#endif
#define CHECK(txt, v1, val, f, pd) \
do{ \
unsigned long long ret; \
profile_start(pd); \
ret=(unsigned long long)f(val); \
profile_end(pd); \
if ((unsigned long long)v1!=ret){ \
fprintf(stderr, "ERROR:" #f ": %s, expected %llx (%llx), got"\
" %llx\n", \
(txt), (unsigned long long)v1, \
(unsigned long long)val, ret); \
exit(-1); \
} \
}while(0)
#ifndef PROFILE_PRINT
#define PROFILE_PRINT(pd) \
do{ \
printf("profile: %s (%ld/%ld) total %llu max %llu average %llu\n", \
(pd)->name, (pd)->entries, (pd)->exits, \
(pd)->total_cycles, (pd)->max_cycles, \
(pd)->entries? \
(pd)->total_cycles/(unsigned long long)(pd)->entries:0ULL ); \
}while(0)
#endif
int main(int argc, char** argv)
{
int r;
unsigned int v;
unsigned long long ll;
int i;
#ifndef NO_PROFILE
struct profile_data pdf1, pdf2, pdf4, pdf5, pdf6, pdf8;
struct profile_data pdl1, pdl2, pdl4, pdl5, pdl6, pdl8;
#ifdef HAS_BIT_SCAN_ASM
struct profile_data pdf3, pdf7, pdl3, pdl7;
#endif
struct profile_data pdf_32, pdf_64, pdl_32, pdl_64;
struct profile_data pdf_long, pdl_long;
#endif /* NO_PROFILE */
profile_init(&pdf1, "first_debruijn32");
profile_init(&pdf2, "first_slow32");
#ifdef HAS_BIT_SCAN_ASM
profile_init(&pdf3, "first_asm32");
#endif
profile_init(&pdf4, "first_br32");
profile_init(&pdf5, "first_debruijn64");
profile_init(&pdf6, "first_slow64");
#ifdef HAS_BIT_SCAN_ASM
profile_init(&pdf7, "first_asm64");
#endif
profile_init(&pdf8, "first_br64");
profile_init(&pdl1, "last_debruijn32");
profile_init(&pdl2, "last_slow32");
#ifdef HAS_BIT_SCAN_ASM
profile_init(&pdl3, "last_asm32");
#endif
profile_init(&pdl4, "last_br32");
profile_init(&pdl5, "last_debruijn64");
profile_init(&pdl6, "last_slow64");
#ifdef HAS_BIT_SCAN_ASM
profile_init(&pdl7, "last_asm64");
#endif
profile_init(&pdl8, "last_br64");
profile_init(&pdf_32, "scan_forward32");
profile_init(&pdf_64, "scan_forward64");
profile_init(&pdl_32, "scan_reverse32");
profile_init(&pdl_64, "scan_reverse64");
profile_init(&pdf_long, "scan_forward_l");
profile_init(&pdl_long, "scan_reverse_l");
for (i=0; i<100; i++){
for (r=0; r<32; r++){
v=(1U<<r);
CHECK("first debruijn 32bit", r, v, bit_scan_forward_debruijn32, &pdf1);
CHECK("first slow 32bit", r, v, bit_scan_forward_slow32, &pdf2);
#ifdef HAS_BIT_SCAN_ASM
CHECK("first asm 32bit", r, v, bit_scan_forward_asm32, &pdf3);
#endif
CHECK("first br 32bit", r, v, bit_scan_forward_br32, &pdf4);
CHECK("scan_forward32", r, v, bit_scan_forward32, &pdf_32);
if (sizeof(long)<=4){
CHECK("scan_forward_l", r, v, bit_scan_forward, &pdf_long);
}
v+=(v-1);
CHECK("last debruijn 32bit", r, v, bit_scan_reverse_debruijn32, &pdl1);
CHECK("last slow 32bit", r, v, bit_scan_reverse_slow32, &pdl2);
#ifdef HAS_BIT_SCAN_ASM
CHECK("last asm 32bit", r, v, bit_scan_reverse_asm32, &pdl3);
#endif
CHECK("last br 32bit", r, v, bit_scan_reverse_br32, &pdl4);
CHECK("scan_reverse32", r, v, bit_scan_reverse32, &pdl_32);
if (sizeof(long)<=4){
CHECK("scan_reverse_l", r, v, bit_scan_reverse, &pdl_long);
}
}
for (r=0; r<64; r++){
ll=(1ULL<<r);
CHECK("first debruijn 64bit", r, ll, bit_scan_forward_debruijn64, &pdf5);
CHECK("first slow 64bit", r, ll, bit_scan_forward_slow64, &pdf6);
#ifdef HAS_BIT_SCAN_ASM
CHECK("first asm 64bit", r, ll, bit_scan_forward_asm64, &pdf7);
#endif
CHECK("first br 64bit", r, ll, bit_scan_forward_br64, &pdf8);
CHECK("scan_forward64", r, ll, bit_scan_forward64, &pdf_64);
if (sizeof(long)>4){
CHECK("scan_forward_l", r, ll, bit_scan_forward, &pdf_long);
}
ll+=ll-1;
CHECK("last debruijn 64bit", r, ll, bit_scan_reverse_debruijn64, &pdl5);
CHECK("last slow 64bit", r, ll, bit_scan_reverse_slow64, &pdl6);
#ifdef HAS_BIT_SCAN_ASM
CHECK("last asm 64bit", r, ll, bit_scan_reverse_asm64, &pdl7);
#endif
CHECK("last br 64bit", r, ll, bit_scan_reverse_br64, &pdl8);
CHECK("scan_reverse64", r, ll, bit_scan_reverse64, &pdl_64);
if (sizeof(long)>4){
CHECK("scan_reverse_l", r, ll, bit_scan_reverse, &pdl_long);
}
}
}
PROFILE_PRINT(&pdf1);
PROFILE_PRINT(&pdf2);
#ifdef HAS_BIT_SCAN_ASM
PROFILE_PRINT(&pdf3);
#endif
PROFILE_PRINT(&pdf4);
PROFILE_PRINT(&pdl1);
PROFILE_PRINT(&pdl2);
#ifdef HAS_BIT_SCAN_ASM
PROFILE_PRINT(&pdl3);
#endif
PROFILE_PRINT(&pdl4);
PROFILE_PRINT(&pdf5);
PROFILE_PRINT(&pdf6);
#ifdef HAS_BIT_SCAN_ASM
PROFILE_PRINT(&pdf7);
#endif
PROFILE_PRINT(&pdf8);
PROFILE_PRINT(&pdl5);
PROFILE_PRINT(&pdl6);
#ifdef HAS_BIT_SCAN_ASM
PROFILE_PRINT(&pdl7);
#endif
PROFILE_PRINT(&pdl8);
PROFILE_PRINT(&pdf_32);
PROFILE_PRINT(&pdf_64);
PROFILE_PRINT(&pdf_long);
PROFILE_PRINT(&pdl_32);
PROFILE_PRINT(&pdl_64);
PROFILE_PRINT(&pdl_long);
return 0;
}