From bc068a23d095cf8bc0126c663fee5e8c50c6699c Mon Sep 17 00:00:00 2001
From: Changpeng Fang <changpeng.fang@amd.com>
Date: Mon, 23 Aug 2010 17:45:08 +0000
Subject: [PATCH] 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
---
gcc/ChangeLog | 12 ++++++++++++
gcc/tree-flow.h | 1 +
gcc/tree-ssa-loop-ivopts.c | 2 +-
gcc/tree-ssa-loop-prefetch.c | 4 ++++
4 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fb77db6d53f0..dac6ea85fbaf 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 04ba5325f11f..67313088ffdf 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 a347c86025ad..0029c762687e 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 9ad6cd2a59e5..4e7068f18593 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;
--
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