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comparison gcc/testsuite/gcc.dg/pr10392-1.c @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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68:561a7518be6b 111:04ced10e8804
1 /* PR optimization/10392
2 * Reporter: marcus@mc.pp.se
3 * Summary: [3.3/3.4 regression] [SH] optimizer generates faulty array indexing
4 * Description:
5 * The address calculation of an index operation on an array on the stack
6 * can _under some conditions_ get messed up completely
7 *
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.
12 */
13 /* { dg-do run } */
14 /* { dg-options "-O2" } */
15 /* { dg-options "-O2 -m4" { target sh4-*-* } } */
16 extern void abort (void);
17 const char *dont_optimize_function_away;
18
19 const char *use(const char *str)
20 {
21 dont_optimize_function_away = str;
22 if (str[0] != 'v')
23 abort();
24 if (str[1] < '1' || str[1] > '6')
25 abort();
26 if (str[2])
27 abort();
28 return str[2] ? "notused" : "v6";
29 }
30
31 const char *func(char *a, char *b)
32 {
33 char buf[128];
34 unsigned char i;
35 const char *result;
36
37 char *item[] = {
38 "v1",
39 "v2",
40 };
41
42 buf[0] = 'v';
43 buf[1] = '3';
44 buf[2] = 0;
45
46 for (i = 0; i < 2; i++) {
47 /* bug is: following line passes wild pointer to use() on sh4 -O2 */
48 result = use(item[i]);
49
50 use(buf);
51 use(a);
52 use(b);
53 result = use(result);
54 }
55 return result;
56 }
57
58 int main()
59 {
60 func("v4", "v5");
61 return 0;
62 }
63