diff options
| author | cfang <cfang@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-08-23 17:45:08 +0000 |
|---|---|---|
| committer | cfang <cfang@138bc75d-0d04-0410-961f-82ee72b054a4> | 2010-08-23 17:45:08 +0000 |
| commit | 09a6f6f50279485f8727c768e35c18cc6a22afd4 (patch) | |
| tree | 9db10ff1386e8c9e1c0147f462aacb0ee6eaab28 /gcc | |
| parent | b6414606073927bbdbbce859afd266303ae03b39 (diff) | |
| download | gcc-09a6f6f50279485f8727c768e35c18cc6a22afd4.tar.gz | |
pr45260 Don't generate prefetch if the address of base could not be taken.
* tree-flow.h (may_be_nonaddressable_p): New definition. Make the
existing static function global.
*tree-ssa-loop-ivopts.c (may_be_nonaddressable_p): This function
is changed to global.
*tree-ssa-loop-prefetch.c (gather_memory_references_ref): Call
may_be_nonaddressable_p on base, and don't collect this reference
if the address of the base could not be taken.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@163475 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 12 | ||||
| -rw-r--r-- | gcc/tree-flow.h | 1 | ||||
| -rw-r--r-- | gcc/tree-ssa-loop-ivopts.c | 2 | ||||
| -rw-r--r-- | gcc/tree-ssa-loop-prefetch.c | 4 |
4 files changed, 18 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index fb77db6d53f..dac6ea85fba 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,15 @@ +2010-08-23 Changpeng Fang <changpeng.fang@amd.com> + + * tree-flow.h (may_be_nonaddressable_p): New definition. Make the + existing static function global. + + *tree-ssa-loop-ivopts.c (may_be_nonaddressable_p): This function + is changed to global. + + *tree-ssa-loop-prefetch.c (gather_memory_references_ref): Call + may_be_nonaddressable_p on base, and don't collect this reference + if the address of the base could not be taken. + 2010-08-23 Michael Meissner <meissner@linux.vnet.ibm.com> * config/rs6000/rs6000.opt (-mveclibabi=mass): New option to diff --git a/gcc/tree-flow.h b/gcc/tree-flow.h index 04ba5325f11..67313088ffd 100644 --- a/gcc/tree-flow.h +++ b/gcc/tree-flow.h @@ -817,6 +817,7 @@ bool stmt_invariant_in_loop_p (struct loop *, gimple); bool multiplier_allowed_in_address_p (HOST_WIDE_INT, enum machine_mode, addr_space_t); unsigned multiply_by_cost (HOST_WIDE_INT, enum machine_mode, bool); +bool may_be_nonaddressable_p (tree expr); /* In tree-ssa-threadupdate.c. */ extern bool thread_through_all_blocks (bool); diff --git a/gcc/tree-ssa-loop-ivopts.c b/gcc/tree-ssa-loop-ivopts.c index a347c86025a..0029c762687 100644 --- a/gcc/tree-ssa-loop-ivopts.c +++ b/gcc/tree-ssa-loop-ivopts.c @@ -1640,7 +1640,7 @@ may_be_unaligned_p (tree ref, tree step) /* Return true if EXPR may be non-addressable. */ -static bool +bool may_be_nonaddressable_p (tree expr) { switch (TREE_CODE (expr)) diff --git a/gcc/tree-ssa-loop-prefetch.c b/gcc/tree-ssa-loop-prefetch.c index 9ad6cd2a59e..4e7068f1859 100644 --- a/gcc/tree-ssa-loop-prefetch.c +++ b/gcc/tree-ssa-loop-prefetch.c @@ -539,6 +539,10 @@ gather_memory_references_ref (struct loop *loop, struct mem_ref_group **refs, if (step == NULL_TREE) return false; + /* Stop if the address of BASE could not taken. */ + if (may_be_nonaddressable_p (base)) + return false; + /* Limit non-constant step prefetching only to the innermost loops. */ if (!cst_and_fits_in_hwi (step) && loop->inner != NULL) return false; |