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| author | Richard Guenther <rguenther@suse.de> | 2008-02-15 15:24:19 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2008-02-15 15:24:19 +0000 |
| commit | 2e58df6ecf3d060e3a8bd95f898baf89f733e1f5 (patch) | |
| tree | 84bac3426747a9ff72e762dc1ff06bfc9e4f61f7 /gcc/tree-dfa.c | |
| parent | 508515b0277f2adadc610acb2dd14f769ba992ff (diff) | |
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re PR tree-optimization/35164 (Unable to coalesce ab SSA_NAMEs)
2008-02-15 Richard Guenther <rguenther@suse.de>
Zdenek Dvorak <ook@ucw.cz>
PR tree-optimization/35164
* tree-flow.h (stmt_references_abnormal_ssa_name): Declare.
* tree-dfa.c (stmt_references_abnormal_ssa_name): New function.
* tree-ssa-forwprop.c (tree_ssa_forward_propagate_single_use_vars):
Only propagate addresses which do not have abnormal SSA_NAMEs
in their operands.
* g++.dg/torture/pr35164-1.C: New testcase.
* g++.dg/torture/pr35164-2.C: Likewise.
Co-Authored-By: Zdenek Dvorak <ook@ucw.cz>
From-SVN: r132345
Diffstat (limited to 'gcc/tree-dfa.c')
| -rw-r--r-- | gcc/tree-dfa.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/gcc/tree-dfa.c b/gcc/tree-dfa.c index f79df0b..346f6f3 100644 --- a/gcc/tree-dfa.c +++ b/gcc/tree-dfa.c @@ -1028,3 +1028,21 @@ get_ref_base_and_extent (tree exp, HOST_WIDE_INT *poffset, return exp; } +/* Returns true if STMT references an SSA_NAME that has + SSA_NAME_OCCURS_IN_ABNORMAL_PHI set, otherwise false. */ + +bool +stmt_references_abnormal_ssa_name (tree stmt) +{ + ssa_op_iter oi; + use_operand_p use_p; + + FOR_EACH_SSA_USE_OPERAND (use_p, stmt, oi, SSA_OP_USE) + { + if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (USE_FROM_PTR (use_p))) + return true; + } + + return false; +} + |