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| author | Richard Guenther <rguenther@suse.de> | 2011-09-07 11:28:39 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2011-09-07 11:28:39 +0000 |
| commit | 601f64e2e91c232210796cce3bc12a2e19a36ff2 (patch) | |
| tree | c6bedca9793378da04071c4b6c255b9f6de8eec4 /gcc/tree-ssa-dom.c | |
| parent | 1aeee5ad50a46b9104eb9430054ff1d76dd5fe42 (diff) | |
| download | gcc-601f64e2e91c232210796cce3bc12a2e19a36ff2.zip gcc-601f64e2e91c232210796cce3bc12a2e19a36ff2.tar.gz gcc-601f64e2e91c232210796cce3bc12a2e19a36ff2.tar.bz2 | |
re PR tree-optimization/50213 (Regression in space-optimized code relative to 4.5.x)
2011-09-07 Richard Guenther <rguenther@suse.de>
PR tree-optimization/50213
* tree-flow.h (simple_iv_increment_p): Declare.
* tree-ssa-dom.c (simple_iv_increment_p): Export. Also handle
POINTER_PLUS_EXPR.
* tree-ssa-forwprop.c (ssa_forward_propagate_and_combine): Do
not propagate simple IV counter increments.
From-SVN: r178633
Diffstat (limited to 'gcc/tree-ssa-dom.c')
| -rw-r--r-- | gcc/tree-ssa-dom.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c index 7a00c8a..18923ae 100644 --- a/gcc/tree-ssa-dom.c +++ b/gcc/tree-ssa-dom.c @@ -1409,9 +1409,10 @@ record_equality (tree x, tree y) i_1 = phi (..., i_2) i_2 = i_1 +/- ... */ -static bool +bool simple_iv_increment_p (gimple stmt) { + enum tree_code code; tree lhs, preinc; gimple phi; size_t i; @@ -1423,12 +1424,13 @@ simple_iv_increment_p (gimple stmt) if (TREE_CODE (lhs) != SSA_NAME) return false; - if (gimple_assign_rhs_code (stmt) != PLUS_EXPR - && gimple_assign_rhs_code (stmt) != MINUS_EXPR) + code = gimple_assign_rhs_code (stmt); + if (code != PLUS_EXPR + && code != MINUS_EXPR + && code != POINTER_PLUS_EXPR) return false; preinc = gimple_assign_rhs1 (stmt); - if (TREE_CODE (preinc) != SSA_NAME) return false; |