1 /* PR optimization/10392
2 * Reporter: marcus@mc.pp.se
3 * Summary: [3.3/3.4 regression] [SH] optimizer generates faulty array indexing
5 * The address calculation of an index operation on an array on the stack
6 * can _under some conditions_ get messed up completely
8 * Testcase tweaked by dank@kegel.com
9 * Problem only happens with -O2 -m4, so it should only happen on sh4,
10 * but what the heck, let's test other architectures, too.
11 * Not marked as xfail since it's a regression.
14 /* { dg-options "-O2" } */
15 /* { dg-options "-O2 -m4" { target sh4-*-* } } */
16 const char *dont_optimize_function_away;
18 const char *use(const char *str)
20 dont_optimize_function_away = str;
23 if (str[1] < '1' || str[1] > '6')
27 return str[2] ? "notused" : "v6";
30 const char *func(char *a, char *b)
45 for (i = 0; i < 2; i++) {
46 /* bug is: following line passes wild pointer to use() on sh4 -O2 */
47 result = use(item[i]);