File: ssa-pre-19.c

package info (click to toggle)
gcc-riscv64-unknown-elf 8.3.0.2019.08%2Bdfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 680,956 kB
  • sloc: ansic: 3,237,715; cpp: 896,882; ada: 772,854; f90: 144,254; asm: 68,788; makefile: 67,456; sh: 29,743; exp: 28,045; objc: 15,273; fortran: 11,885; python: 7,369; pascal: 5,375; awk: 3,725; perl: 2,872; yacc: 316; xml: 311; ml: 285; lex: 198; haskell: 122
file content (38 lines) | stat: -rw-r--r-- 636 bytes parent folder | download | duplicates (6) 
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
32
33
34
35
36
37
38
 
/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-pre-stats" } */

struct Loc {
    int x[3];
};

void bar (struct Loc *);

int foo (int i, int j, int k, int b)
{
  struct Loc IND;
  int res;

  if (b)
    {
      IND.x[0] = i;
      IND.x[1] = j;
      IND.x[2] = k-1;
    }
  else
    {
      IND.x[0] = i;
      IND.x[1] = j;
      IND.x[2] = k;
    }

  /* This should be optimized to i + j + {k, k + 1}.  */
  res = IND.x[0] + IND.x[1] + IND.x[2];

  /* This is just to prevent SRA.  */
  bar (&IND);

  return res;
}

/* All three loads should be eliminated.  */
/* { dg-final { scan-tree-dump "Eliminated: 3" "pre" } } */