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| author | spop <spop@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-06-09 22:09:41 +0000 |
|---|---|---|
| committer | spop <spop@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-06-09 22:09:41 +0000 |
| commit | dfeb6545e649ba53adf17b8d77f6499b7cb02977 (patch) | |
| tree | 16cb9ff437410085c14df0ecfcb646e19a6e2c9c /gcc/tree-scalar-evolution.c | |
| parent | dff64cac3ba39c55966dbd20dd298a28ecd9bab0 (diff) | |
| download | gcc-dfeb6545e649ba53adf17b8d77f6499b7cb02977.tar.gz | |
Call compute_overall_effect_of_inner_loop from instantiate_scev_name.
2010-06-09 Sebastian Pop <sebastian.pop@amd.com>
* tree-scalar-evolution.c (instantiate_scev_name): Do not fail
the scev analysis when the variable is not used outside the loop
in a close phi node: call compute_overall_effect_of_inner_loop.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@160510 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-scalar-evolution.c')
| -rw-r--r-- | gcc/tree-scalar-evolution.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/gcc/tree-scalar-evolution.c b/gcc/tree-scalar-evolution.c index 5eb61740bee..13d897fd5ce 100644 --- a/gcc/tree-scalar-evolution.c +++ b/gcc/tree-scalar-evolution.c @@ -2172,9 +2172,19 @@ instantiate_scev_name (basic_block instantiate_below, else res = chrec; - if (res == NULL_TREE - || !dominated_by_p (CDI_DOMINATORS, instantiate_below, - gimple_bb (SSA_NAME_DEF_STMT (res)))) + /* When there is no loop_closed_phi_def, it means that the + variable is not used after the loop: try to still compute the + value of the variable when exiting the loop. */ + if (res == NULL_TREE) + { + loop_p loop = loop_containing_stmt (SSA_NAME_DEF_STMT (chrec)); + res = analyze_scalar_evolution (loop, chrec); + res = compute_overall_effect_of_inner_loop (loop, res); + res = instantiate_scev_r (instantiate_below, evolution_loop, res, + fold_conversions, cache, size_expr); + } + else if (!dominated_by_p (CDI_DOMINATORS, instantiate_below, + gimple_bb (SSA_NAME_DEF_STMT (res)))) res = chrec_dont_know; } |