From cf282d0a4a9174888fd9add60d26acfac1601a0e Mon Sep 17 00:00:00 2001
From: Jeff Law <law@redhat.com>
Date: Mon, 10 Apr 2006 23:52:45 -0600
Subject: [PATCH] tree-ssa-copy.c (may_propagate_copy): Test flow sensitive
alias information too.
PR/27087
* tree-ssa-copy.c (may_propagate_copy): Test flow sensitive
alias information too.
* gcc.c-torture/compile/pr27087.c: New test.
From-SVN: r112849
---
gcc/ChangeLog | 6 +++++
gcc/testsuite/ChangeLog | 5 ++++
gcc/testsuite/gcc.c-torture/compile/pr27087.c | 23 +++++++++++++++++++
gcc/tree-ssa-copy.c | 15 ++++++++++++
4 files changed, 49 insertions(+)
create mode 100644 gcc/testsuite/gcc.c-torture/compile/pr27087.c
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c5aa369f7f4c..0588113f0481 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2006-04-03 Jeff Law <law@redhat.com>
+
+ PR/27087
+ * tree-ssa-copy.c (may_propagate_copy): Test flow sensitive
+ alias information too.
+
2006-04-10 Mike Frysinger <vapier@gentoo.org>
* gcc/Makefile.in (gcc-cross): Add $(exeext) to target name.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 237a690b6578..f71c86bc6c2a 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2006-04-10 Jeff Law <law@redhat.com>
+
+ PR/27087
+ * gcc.c-torture/compile/pr27087.c: New test.
+
2006-04-10 Aldy Hernandez <aldyh@redhat.com>
PR/21391
diff --git a/gcc/testsuite/gcc.c-torture/compile/pr27087.c b/gcc/testsuite/gcc.c-torture/compile/pr27087.c
new file mode 100644
index 000000000000..3add13bcbeb3
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr27087.c
@@ -0,0 +1,23 @@
+extern int ptbl[4];
+extern int ctbl[4];
+
+void doViews(void) {
+ int *c = ctbl, *p = ptbl;
+ while (1)
+ {
+ p++;
+ c++;
+ if (*p)
+ {
+ if (c == p)
+ {
+ if (*c)
+ return;
+ }
+ else
+ return;
+ }
+ }
+
+ g();
+}
diff --git a/gcc/tree-ssa-copy.c b/gcc/tree-ssa-copy.c
index fca44d76c055..f1b67b5bf2aa 100644
--- a/gcc/tree-ssa-copy.c
+++ b/gcc/tree-ssa-copy.c
@@ -117,6 +117,21 @@ may_propagate_copy (tree dest, tree orig)
else if (get_alias_set (TREE_TYPE (type_d)) !=
get_alias_set (TREE_TYPE (type_o)))
return false;
+
+ /* Also verify flow-sensitive information is compatible. */
+ if (SSA_NAME_PTR_INFO (orig) && SSA_NAME_PTR_INFO (dest))
+ {
+ struct ptr_info_def *orig_ptr_info = SSA_NAME_PTR_INFO (orig);
+ struct ptr_info_def *dest_ptr_info = SSA_NAME_PTR_INFO (dest);
+
+ if (orig_ptr_info->name_mem_tag
+ && dest_ptr_info->name_mem_tag
+ && orig_ptr_info->pt_vars
+ && dest_ptr_info->pt_vars
+ && !bitmap_intersect_p (dest_ptr_info->pt_vars,
+ orig_ptr_info->pt_vars))
+ return false;
+ }
}
/* If the destination is a SSA_NAME for a virtual operand, then we have
--
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