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| author | Richard Guenther <rguenther@suse.de> | 2011-01-14 12:15:43 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2011-01-14 12:15:43 +0000 |
| commit | 6c0c92e6b37e27b14dc3fb8a02ee4e0e8c33b658 (patch) | |
| tree | 96cb277606ed0c9ba072b1fe08d770be7c52ad62 /gcc | |
| parent | db09f9434d83e144068149a34fe3b24b5d5a5d61 (diff) | |
| download | gcc-6c0c92e6b37e27b14dc3fb8a02ee4e0e8c33b658.zip gcc-6c0c92e6b37e27b14dc3fb8a02ee4e0e8c33b658.tar.gz gcc-6c0c92e6b37e27b14dc3fb8a02ee4e0e8c33b658.tar.bz2 | |
re PR tree-optimization/47286 (Invalid code when using register ... asm)
2011-01-14 Richard Guenther <rguenther@suse.de>
PR tree-optimization/47286
* tree-ssa-structalias.c (new_var_info): Register variables
are global.
* gcc.dg/tree-ssa/pr47286.c: New testcase.
From-SVN: r168779
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/pr47286.c | 20 | ||||
| -rw-r--r-- | gcc/tree-ssa-structalias.c | 5 |
4 files changed, 35 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 2ad6e8b..939d7f1 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2011-01-14 Richard Guenther <rguenther@suse.de> + + PR tree-optimization/47286 + * tree-ssa-structalias.c (new_var_info): Register variables + are global. + 2011-01-14 Martin Jambor <mjambor@suse.cz> PR middle-end/46823 diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 8762f9a..ed3a787 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2011-01-14 Richard Guenther <rguenther@suse.de> + + PR tree-optimization/47286 + * gcc.dg/tree-ssa/pr47286.c: New testcase. + 2011-01-13 Kai Tietz <kai.tietz@onevision.com> PR c++/47213 diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr47286.c b/gcc/testsuite/gcc.dg/tree-ssa/pr47286.c new file mode 100644 index 0000000..b03c59b --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr47286.c @@ -0,0 +1,20 @@ +/* { dg-do compile } */ +/* { dg-skip-if "" { ! { i?86-*-* x86_64-*-* } } { "*" } { "" } } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +struct thread_info { int preempt_count; }; +static inline struct thread_info *current_thread_info(void) +{ + register struct thread_info *sp asm("esp"); + return sp; +} +void testcase(void) +{ + current_thread_info()->preempt_count += 1; +} + +/* We have to make sure that alias analysis treats sp as pointing + to globals and thus the store not optimized away. */ + +/* { dg-final { scan-tree-dump "->preempt_count =" "optimized" } } */ +/* { dg-final { cleanup-tree-dump "optimized" } } */ diff --git a/gcc/tree-ssa-structalias.c b/gcc/tree-ssa-structalias.c index a31b953..d3a54c6 100644 --- a/gcc/tree-ssa-structalias.c +++ b/gcc/tree-ssa-structalias.c @@ -413,7 +413,10 @@ new_var_info (tree t, const char *name) ret->is_global_var = (t == NULL_TREE); ret->is_fn_info = false; if (t && DECL_P (t)) - ret->is_global_var = is_global_var (t); + ret->is_global_var = (is_global_var (t) + /* We have to treat even local register variables + as escape points. */ + || (TREE_CODE (t) == VAR_DECL && DECL_REGISTER (t))); ret->solution = BITMAP_ALLOC (&pta_obstack); ret->oldsolution = BITMAP_ALLOC (&oldpta_obstack); ret->next = NULL; |