diff options
| author | Richard Guenther <rguenther@suse.de> | 2007-11-09 12:32:20 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2007-11-09 12:32:20 +0000 |
| commit | 6aaa40131a37f28ffc3f1788b66293248b4abb5c (patch) | |
| tree | 7d2129cd384ed49e7ccc4d5da76366ff0ada7d49 /gcc/tree-ssa-forwprop.c | |
| parent | 06acf7d0ad169b40c2e7f83c7ed808b2e196a6a4 (diff) | |
| download | gcc-6aaa40131a37f28ffc3f1788b66293248b4abb5c.zip gcc-6aaa40131a37f28ffc3f1788b66293248b4abb5c.tar.gz gcc-6aaa40131a37f28ffc3f1788b66293248b4abb5c.tar.bz2 | |
re PR target/33604 (Revision 119502 causes significantly slower results with 4.3/4.4 compared to 4.2)
2007-11-09 Richard Guenther <rguenther@suse.de>
PR tree-optimization/33604
* tree-ssa-forwprop.c (tree_ssa_forward_propagate_single_use_vars):
Disregard changes in CV qualifiers of pointed to types for
forward propagating ADDR_EXPRs.
* tree-ssa-ccp.c (fold_stmt_r): Preserve volatileness of the original
expression.
* g++.dg/tree-ssa/pr33604.C: New testcase.
* gcc.dg/pr32721.c: Adjust pattern.
From-SVN: r130040
Diffstat (limited to 'gcc/tree-ssa-forwprop.c')
| -rw-r--r-- | gcc/tree-ssa-forwprop.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/tree-ssa-forwprop.c b/gcc/tree-ssa-forwprop.c index 047d057..bacd34e 100644 --- a/gcc/tree-ssa-forwprop.c +++ b/gcc/tree-ssa-forwprop.c @@ -952,7 +952,15 @@ tree_ssa_forward_propagate_single_use_vars (void) continue; } - if (TREE_CODE (rhs) == ADDR_EXPR) + if (TREE_CODE (rhs) == ADDR_EXPR + /* We can also disregard changes in CV qualifiers for + the dereferenced value. */ + || ((TREE_CODE (rhs) == NOP_EXPR + || TREE_CODE (rhs) == CONVERT_EXPR) + && TREE_CODE (TREE_OPERAND (rhs, 0)) == ADDR_EXPR + && POINTER_TYPE_P (TREE_TYPE (rhs)) + && useless_type_conversion_p (TREE_TYPE (TREE_TYPE (rhs)), + TREE_TYPE (TREE_TYPE (TREE_OPERAND (rhs, 0)))))) { if (forward_propagate_addr_expr (lhs, rhs)) { |