File: modref-dse-2.c

package info (click to toggle)
gcc-arm-none-eabi 15%3A14.2.rel1-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,099,328 kB
  • sloc: cpp: 3,627,108; ansic: 2,571,498; ada: 834,230; f90: 235,082; makefile: 79,231; asm: 74,984; xml: 51,692; exp: 39,736; sh: 33,298; objc: 15,629; python: 15,069; fortran: 14,429; pascal: 7,003; awk: 5,070; perl: 3,106; ml: 285; lisp: 253; lex: 204; haskell: 135
file content (31 lines) | stat: -rw-r--r-- 531 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
 
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-dse2-details"  } */
volatile int *ptr;
struct a {
	int a,b,c;
} a;
__attribute__((noinline))
static int init (struct a*a)
{
	a->a=0;
	a->b=1;
	a->c=1;
}
__attribute__((noinline))
static int use (struct a*a)
{
	if (a->c != 3)
		*ptr=5;
}

void
main(void)
{
	struct a a;
	init (&a);
	a.c=3;
	use (&a);
}
/* Only DSE2 is tracking live bytes needed to figure out that store to c is
   also dead above.  */
/* { dg-final { scan-tree-dump "Deleted dead store: init" "dse2" } } */