[Bug optimization/10392] [3.3/3.4 regression] [SH] optimizer generates faulty array indexing

[marcus at mc dot pp dot se]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10392



------- Additional Comments From marcus at mc dot pp dot se  2003-09-12 19:06 -------
Subject: Re:  [3.3/3.4 regression] [SH] optimizer generates faulty array indexing


Here is the reproduction recipe reworked as a runnable testsuite test.
If the program exits with code 0, the compiler is ok.  If it exits
with code 1 or segfaults, the compiler is not ok.

---8<--- test.c ---8<---
#include <stdio.h>
#include <string.h>

char res[128];

char *use(char *z)
{
  strncat(res, z, 10);
  return "X";
}

void func(char *a, char *b)
{
  char buf[128];
  unsigned char i; 
  char *item[] = {
    "one",
    "two",
  };
  strcpy(buf, "buf");
  for(i=0; i<2; i++) {
    char *x;
    use(item[i]);
    x = use(buf);
    use(a);
    use(b);
    use(x);
  }
}

int main()
{
  strcpy(res, "<");
  func("A", "B");
  strcat(res, ">");
  /* printf("res=\"%s\"\n", res); */
  return strcmp(res, "<onebufABXtwobufABX>")? 1 : 0;
}
---8<---