Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/gcc.dg/strlenopt-1.c @ 111:04ced10e8804
gcc 7
author | kono |
---|---|
date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 1830386684a0 |
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/* { dg-do run } */ /* { dg-options "-O2 -fdump-tree-strlen" } */ #include "strlenopt.h" __attribute__((noinline, noclone)) char * foo (char *p, char *r) { char *q = malloc (strlen (p) + strlen (r) + 64); if (q == NULL) return NULL; /* This strcpy can be optimized into memcpy, using the remembered strlen (p). */ strcpy (q, p); /* These two strcat can be optimized into memcpy. The first one could be even optimized into a *ptr = '/'; store as the '\0' is immediately overwritten. */ strcat (q, "/"); strcat (q, "abcde"); /* This can also be optimized into memcpy. */ strcat (q, r); return q; } int main () { char *volatile p = "string1"; char *volatile r = "string2"; char *q = foo (p, r); if (q != NULL) { if (strcmp (q, "string1/abcdestring2")) abort (); free (q); } return 0; } /* { dg-final { scan-tree-dump-times "strlen \\(" 2 "strlen" } } */ /* { dg-final { scan-tree-dump-times "memcpy \\(" 4 "strlen" } } */ /* { dg-final { scan-tree-dump-times "strcpy \\(" 0 "strlen" } } */ /* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen" } } */ /* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen" } } */ /* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen" } } */