diff options
| author | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2009-10-05 13:18:09 +0000 |
|---|---|---|
| committer | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2009-10-05 13:18:09 +0000 |
| commit | 09d0041cb92d96d749a3a5d5dfab78de3100d9d9 (patch) | |
| tree | a75051f3125eb16e951b2147ac6b7ed7152c8259 /gcc/tree-ssa-dom.c | |
| parent | c28a9975903eefaa7c171fb5865972ab248f927d (diff) | |
| download | gcc-09d0041cb92d96d749a3a5d5dfab78de3100d9d9.tar.gz | |
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.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@152449 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-ssa-dom.c')
| -rw-r--r-- | gcc/tree-ssa-dom.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c index 05a8d92a86f..4bad3ddaf48 100644 --- a/gcc/tree-ssa-dom.c +++ b/gcc/tree-ssa-dom.c @@ -1998,6 +1998,12 @@ cprop_operand (gimple stmt, use_operand_p op_p) if (loop_depth_of_name (val) > loop_depth_of_name (op)) return; + /* Do not propagate copies into simple IV increment statements. + See PR23821 for how this can disturb IV analysis. */ + if (TREE_CODE (val) != INTEGER_CST + && simple_iv_increment_p (stmt)) + return; + /* Dump details. */ if (dump_file && (dump_flags & TDF_DETAILS)) { |