diff options
| author | vries <vries@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-05-19 08:49:28 +0000 |
|---|---|---|
| committer | vries <vries@138bc75d-0d04-0410-961f-82ee72b054a4> | 2011-05-19 08:49:28 +0000 |
| commit | ee36045b81d96bf80a18b27a14f4f72fb79e4546 (patch) | |
| tree | f13f50496860123c6188318e07c9afc090ed8d7c /gcc/tree-ssa-loop-ivopts.c | |
| parent | bdc52dc844442dc1708269632d9fdbd0b08c3420 (diff) | |
| download | gcc-ee36045b81d96bf80a18b27a14f4f72fb79e4546.tar.gz | |
2011-05-19 Tom de Vries <tom@codesourcery.com>
PR target/45098
* tree-ssa-loop-ivopts.c (determine_iv_cost): Prevent
cost_base.cost == 0.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@173893 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-ssa-loop-ivopts.c')
| -rw-r--r-- | gcc/tree-ssa-loop-ivopts.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gcc/tree-ssa-loop-ivopts.c b/gcc/tree-ssa-loop-ivopts.c index 501dbbf4526..1580aec006a 100644 --- a/gcc/tree-ssa-loop-ivopts.c +++ b/gcc/tree-ssa-loop-ivopts.c @@ -4690,6 +4690,11 @@ determine_iv_cost (struct ivopts_data *data, struct iv_cand *cand) base = cand->iv->base; cost_base = force_var_cost (data, base, NULL); + /* It will be exceptional that the iv register happens to be initialized with + the proper value at no cost. In general, there will at least be a regcopy + or a const set. */ + if (cost_base.cost == 0) + cost_base.cost = COSTS_N_INSNS (1); cost_step = add_cost (TYPE_MODE (TREE_TYPE (base)), data->speed); cost = cost_step + adjust_setup_cost (data, cost_base.cost); |