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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.

From-SVN: r163475
This commit is contained in:
Changpeng Fang 2010-08-23 17:45:08 +00:00 committed by Changpeng Fang
parent f8895c4b7f
commit bc068a23d0
4 changed files with 18 additions and 1 deletions
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12
gcc/ChangeLog
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@ -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

1
gcc/tree-flow.h
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@ -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);

2
gcc/tree-ssa-loop-ivopts.c
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@ -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))

4
gcc/tree-ssa-loop-prefetch.c
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@ -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;