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| author | Richard Guenther <rguenther@suse.de> | 2009-10-05 13:18:09 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2009-10-05 13:18:09 +0000 |
| commit | e9d85fa6a7fdd48c00c02b8ad915a75d3b025708 (patch) | |
| tree | a75051f3125eb16e951b2147ac6b7ed7152c8259 /gcc/tree-vrp.c | |
| parent | 916bd5f07f8a76e05c7f08d5a9b8ac5a21be23d5 (diff) | |
| download | gcc-e9d85fa6a7fdd48c00c02b8ad915a75d3b025708.tar.gz | |
re PR tree-optimization/23821 (DOM and VRP creating harder to optimize code)
2009-10-05 Richard Guenther <rguenther@suse.de>
PR tree-optimization/23821
* tree-vrp.c (vrp_finalize): Do not perform copy propagation.
* tree-ssa-dom.c (cprop_operand): Do not propagate copies into
simple IV increments.
* gcc.dg/torture/pr23821.c: New testcase.
From-SVN: r152449
Diffstat (limited to 'gcc/tree-vrp.c')
| -rw-r--r-- | gcc/tree-vrp.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index 57800075e94..0cb227abbd1 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -7237,7 +7237,7 @@ vrp_finalize (void) } /* We may have ended with ranges that have exactly one value. Those - values can be substituted as any other copy/const propagated + values can be substituted as any other const propagated value using substitute_and_fold. */ single_val_range = XCNEWVEC (prop_value_t, num_ssa_names); @@ -7245,7 +7245,8 @@ vrp_finalize (void) for (i = 0; i < num_ssa_names; i++) if (vr_value[i] && vr_value[i]->type == VR_RANGE - && vr_value[i]->min == vr_value[i]->max) + && vr_value[i]->min == vr_value[i]->max + && is_gimple_min_invariant (vr_value[i]->min)) { single_val_range[i].value = vr_value[i]->min; do_value_subst_p = true; |