1 /* Test for reload failing to eliminate from argp to sp. */
2 /* { dg-do run } */
3 /* { dg-require-effective-target ia32 } */
4 /* { dg-require-effective-target nonpic } */
5 /* { dg-options "-O2 -fomit-frame-pointer" } */
6
7 static int ustrsize (const char *s);
8 static int (*ucwidth) (int c);
9 static int (*ugetxc) (const char **s);
10 static int (*usetc) (char *s, int c);
11
ustrzcat(char * dest,int size,const char * src)12 char *ustrzcat(char *dest, int size, const char *src)
13 {
14 int pos = ustrsize(dest);
15 int c;
16
17 size -= pos + ucwidth(0);
18
19 while ((c = ugetxc(&src)) != 0) {
20 size -= ucwidth(c);
21 if (size < 0)
22 break;
23
24 pos += usetc(dest+pos, c);
25 }
26
27 usetc(dest+pos, 0);
28
29 return dest;
30 }
31
32 static int __attribute__((noinline))
ustrsize(const char * s)33 ustrsize (const char *s)
34 {
35 return 0;
36 }
37
38 static int
ucwidth_(int c)39 ucwidth_ (int c)
40 {
41 return 1;
42 }
43
44 static int
ugetxc_(const char ** s)45 ugetxc_ (const char **s)
46 {
47 return '\0';
48 }
49
50 static int
usetc_(char * s,int c)51 usetc_ (char *s, int c)
52 {
53 return 1;
54 }
55
56 int
main()57 main()
58 {
59 ucwidth = ucwidth_;
60 ugetxc = ugetxc_;
61 usetc = usetc_;
62
63 /* ??? It is impossible to explicitly modify the hard frame pointer.
64 This will run afoul of code in flow.c that declines to mark regs
65 in eliminate_regs in regs_ever_used. Apparently, we have to wait
66 for reload to decide that it won't need a frame pointer before a
67 variable can be allocated to %ebp.
68
69 So save, restore, and clobber %ebp by hand. */
70
71 asm ("pushl %%ebp\n\t"
72 "movl $-1, %%ebp\n\t"
73 "pushl $0\n\t"
74 "pushl $0\n\t"
75 "pushl $0\n\t"
76 "call %P0\n\t"
77 "addl $12, %%esp\n\t"
78 "popl %%ebp"
79 : : "i"(ustrzcat) : "memory" );
80
81 return 0;
82 }
83