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| author | Andrew Pinski <andrew_pinski@playstation.sony.com> | 2009-06-12 19:00:39 +0000 |
|---|---|---|
| committer | Andrew Pinski <pinskia@gcc.gnu.org> | 2009-06-12 12:00:39 -0700 |
| commit | 737142ced7510afcd0144c866d9169ac7cbf3fb6 (patch) | |
| tree | ce8fe06a4a5b43d55c7335eddbcf12d9026c27d4 /gcc/tree-ssa-sccvn.c | |
| parent | d3a0d55d663e3837aaba816af1aabf983df0ffab (diff) | |
| download | gcc-737142ced7510afcd0144c866d9169ac7cbf3fb6.zip gcc-737142ced7510afcd0144c866d9169ac7cbf3fb6.tar.gz gcc-737142ced7510afcd0144c866d9169ac7cbf3fb6.tar.bz2 | |
re PR tree-optimization/38865 (missing FRE with VIEW_CONVERT_EXPR)
2009-06-12 Andrew Pinski <andrew_pinski@playstation.sony.com>
PR tree-opt/38865
* tree-ssa-sccvn.c (visit_reference_op_load): If vn_reference_lookup
is returns NULL and OP is a VCE, look through the VCE.
2009-06-12 Andrew Pinski <andrew_pinski@playstation.sony.com>
PR tree-opt/38865
* gcc.dg/tree-ssa/fre-vce-1.c
:
From-SVN: r148437
Diffstat (limited to 'gcc/tree-ssa-sccvn.c')
| -rw-r--r-- | gcc/tree-ssa-sccvn.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index 03fea75..6d263de 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -1976,6 +1976,12 @@ visit_reference_op_load (tree lhs, tree op, gimple stmt) bool changed = false; tree result = vn_reference_lookup (op, gimple_vuse (stmt), true, NULL); + /* If we have a VCE, try looking up its operand as it might be stored in + a different type. */ + if (!result && TREE_CODE (op) == VIEW_CONVERT_EXPR) + result = vn_reference_lookup (TREE_OPERAND (op, 0), gimple_vuse (stmt), + true, NULL); + /* We handle type-punning through unions by value-numbering based on offset and size of the access. Be prepared to handle a type-mismatch here via creating a VIEW_CONVERT_EXPR. */ |