tools/testing/selftests/powerpc/stringloops/strlen.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <malloc.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <time.h>
   6 #include "utils.h"
   7
   8 #define SIZE 256
   9 #define ITERATIONS 1000
  10 #define ITERATIONS_BENCH 100000
  11
  12 int test_strlen(const void *s);
  13
  14 /* test all offsets and lengths */
  15 static void test_one(char *s)
  16 {
  17         unsigned long offset;
  18
  19         for (offset = 0; offset < SIZE; offset++) {
  20                 int x, y;
  21                 unsigned long i;
  22
  23                 y = strlen(s + offset);
  24                 x = test_strlen(s + offset);
  25
  26                 if (x != y) {
  27                         printf("strlen() returned %d, should have returned %d (%p offset %ld)\n", x, y, s, offset);
  28
  29                         for (i = offset; i < SIZE; i++)
  30                                 printf("%02x ", s[i]);
  31                         printf("\n");
  32                 }
  33         }
  34 }
  35
  36 static void bench_test(char *s)
  37 {
  38         struct timespec ts_start, ts_end;
  39         int i;
  40
  41         clock_gettime(CLOCK_MONOTONIC, &ts_start);
  42
  43         for (i = 0; i < ITERATIONS_BENCH; i++)
  44                 test_strlen(s);
  45
  46         clock_gettime(CLOCK_MONOTONIC, &ts_end);
  47
  48         printf("len %3.3d : time = %.6f\n", test_strlen(s), ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
  49 }
  50
  51 static int testcase(void)
  52 {
  53         char *s;
  54         unsigned long i;
  55
  56         s = memalign(128, SIZE);
  57         if (!s) {
  58                 perror("memalign");
  59                 exit(1);
  60         }
  61
  62         srandom(1);
  63
  64         memset(s, 0, SIZE);
  65         for (i = 0; i < SIZE; i++) {
  66                 char c;
  67
  68                 do {
  69                         c = random() & 0x7f;
  70                 } while (!c);
  71                 s[i] = c;
  72                 test_one(s);
  73         }
  74
  75         for (i = 0; i < ITERATIONS; i++) {
  76                 unsigned long j;
  77
  78                 for (j = 0; j < SIZE; j++) {
  79                         char c;
  80
  81                         do {
  82                                 c = random() & 0x7f;
  83                         } while (!c);
  84                         s[j] = c;
  85                 }
  86                 for (j = 0; j < sizeof(long); j++) {
  87                         s[SIZE - 1 - j] = 0;
  88                         test_one(s);
  89                 }
  90         }
  91
  92         for (i = 0; i < SIZE; i++) {
  93                 char c;
  94
  95                 do {
  96                         c = random() & 0x7f;
  97                 } while (!c);
  98                 s[i] = c;
  99         }
 100
 101         bench_test(s);
 102
 103         s[16] = 0;
 104         bench_test(s);
 105
 106         s[8] = 0;
 107         bench_test(s);
 108
 109         s[4] = 0;
 110         bench_test(s);
 111
 112         s[3] = 0;
 113         bench_test(s);
 114
 115         s[2] = 0;
 116         bench_test(s);
 117
 118         s[1] = 0;
 119         bench_test(s);
 120
 121         return 0;
 122 }
 123
 124 int main(void)
 125 {
 126         return test_harness(testcase, "strlen");
 127 }