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| author | Richard Biener <rguenther@suse.de> | 2015-09-24 07:34:47 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2015-09-24 07:34:47 +0000 |
| commit | 0a28fdcaf70aee998705bf5878f4c508d9641e31 (patch) | |
| tree | 82d9ad8e32a41babe62af07db1041c917bf9129d /gcc | |
| parent | 761d6f4eecc754a409a71b7c1e4853c91ccbec8e (diff) | |
| download | gcc-0a28fdcaf70aee998705bf5878f4c508d9641e31.zip gcc-0a28fdcaf70aee998705bf5878f4c508d9641e31.tar.gz gcc-0a28fdcaf70aee998705bf5878f4c508d9641e31.tar.bz2 | |
re PR c/48885 (missed optimization with restrict qualifier?)
2015-09-24 Richard Biener <rguenther@suse.de>
PR tree-optimization/48885
* tree-ssa-structalias.c (visit_loadstore): Handle default defs
as not including any restrict tags from other pointers.
* gcc.dg/tree-ssa/restrict-6.c: New testcase.
From-SVN: r228073
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/restrict-6.c | 11 | ||||
| -rw-r--r-- | gcc/tree-ssa-structalias.c | 5 |
4 files changed, 25 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index c9eb9af..5ae3e44 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2015-09-24 Richard Biener <rguenther@suse.de> + + PR tree-optimization/48885 + * tree-ssa-structalias.c (visit_loadstore): Handle default defs + as not including any restrict tags from other pointers. + 2015-09-23 Thomas Schwinge <thomas@codesourcery.com> * gcc.c (handle_foffload_option): Don't lose the trailing NUL diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index bf0e13a..1d9b872 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2015-09-24 Richard Biener <rguenther@suse.de> + + PR tree-optimization/48885 + * gcc.dg/tree-ssa/restrict-6.c: New testcase. + 2015-09-24 Patrick Palka <ppalka@gcc.gnu.org> * c-c++-common/Wmisleading-indentation.c: Augment test. diff --git a/gcc/testsuite/gcc.dg/tree-ssa/restrict-6.c b/gcc/testsuite/gcc.dg/tree-ssa/restrict-6.c new file mode 100644 index 0000000..7c5ed01 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/restrict-6.c @@ -0,0 +1,11 @@ +/* { dg-do compile } */ +/* { dg-options "-O -fdump-tree-fre1" } */ + +void +test (int *a, int *b, int * __restrict__ v) +{ + *a = *v; + *b = *v; +} + +/* { dg-final { scan-tree-dump-times "= \\*v" 1 "fre1" } } */ diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c index 8d81bd4..8d86dcb 100644 --- a/gcc/tree-ssa-structalias.c +++ b/gcc/tree-ssa-structalias.c @@ -6952,10 +6952,11 @@ visit_loadstore (gimple *, tree base, tree ref, void *clique_) || TREE_CODE (base) == TARGET_MEM_REF) { tree ptr = TREE_OPERAND (base, 0); - if (TREE_CODE (ptr) == SSA_NAME) + if (TREE_CODE (ptr) == SSA_NAME + && ! SSA_NAME_IS_DEFAULT_DEF (ptr)) { /* ??? We need to make sure 'ptr' doesn't include any of - the restrict tags in its points-to set. */ + the restrict tags we added bases for in its points-to set. */ return false; } |