diff options
Diffstat (limited to 'gcc/testsuite/gcc.dg/tree-ssa/predcom-5.c')
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/predcom-5.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/predcom-5.c b/gcc/testsuite/gcc.dg/tree-ssa/predcom-5.c new file mode 100644 index 00000000000..134fc3765dc --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/predcom-5.c @@ -0,0 +1,30 @@ +/* { dg-do compile } */ +/* { dg-do run } */ +/* { dg-options "-O2 -fpredictive-commoning -fdump-tree-pcom-details" } */ + +/* Test for predictive commoning of expressions, with reassociation. */ + +void abort (void); + +unsigned a[1000], b[1000], c[1000], d[1000]; + +int main(void) +{ + unsigned i; + + for (i = 0; i < 1000; i++) + a[i] = b[i] = d[i] = i; + + for (i = 1; i < 998; i++) + c[i] = d[i + 1] * a[i + 2] * b[i + 1] - b[i - 1] * a[i] * d[i - 1]; + + for (i = 1; i < 998; i++) + if (c[i] != (i+1)*(i+2)*(i+1) - (i - 1) * i * (i - 1)) + abort (); + + return 0; +} + +/* { dg-final { scan-tree-dump-times "Combination" 2 "pcom"} } */ +/* { dg-final { scan-tree-dump-times "Unrolling 3 times." 1 "pcom"} } */ +/* { dg-final { cleanup-tree-dump "pcom" } } */ |