re PR tree-optimization/19831 (Missing DSE/malloc/free optimization)

2009-07-01  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/19831
	* tree-ssa-dce.c (propagate_necessity): Calls to functions
	that only act as barriers do not make any previous stores
	necessary.
	* tree-ssa-structalias.c (handle_lhs_call): Delay making
	HEAP variables global, do not add a constraint from nonlocal.
	(find_func_aliases): Handle escapes through return statements.
	(compute_points_to_sets): Make escaped HEAP variables global.

	* gcc.dg/tree-ssa/20041122-1.c: Enable TBAA, scan FRE dump,
	make allocated memory escape.  Un-XFAIL.
	* gcc.dg/vect/pr21591.c: Make allocated memory escape.
	* gcc.dg/vect/pr31699.c: Likewise.
	* gcc.dg/tree-ssa/ssa-dce-7.c: New testcase.

	libmudflap/
	* testsuite/libmudflap.c/fail11-frag.c: Make allocated memory
	escape.
	* testsuite/libmudflap.c/fail12-frag.c: Likewise.
	* testsuite/libmudflap.c/fail16-frag.c: Likewise.
	* testsuite/libmudflap.c/fail31-frag.c: Likewise.

From-SVN: r149140

5 files changed, 17 insertions, 4 deletions

diff --git a/libmudflap/ChangeLog b/libmudflap/ChangeLog
index 11d6f525f40..75031657d06 100644
--- a/libmudflap/ChangeLog
+++ b/libmudflap/ChangeLog
@@ -1,3 +1,12 @@
+2009-07-01  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/19831
+	* testsuite/libmudflap.c/fail11-frag.c: Make allocated memory
+	escape.
+	* testsuite/libmudflap.c/fail12-frag.c: Likewise.
+	* testsuite/libmudflap.c/fail16-frag.c: Likewise.
+	* testsuite/libmudflap.c/fail31-frag.c: Likewise.
+
 2009-06-30  Richard Sandiford  <r.sandiford@uk.ibm.com>
 
 	* testsuite/lib/libmudflap.exp (libmudflap-init): Don't add "."
diff --git a/libmudflap/testsuite/libmudflap.c/fail11-frag.c b/libmudflap/testsuite/libmudflap.c/fail11-frag.c
index 72038fdba30..ebd1db96717 100644
--- a/libmudflap/testsuite/libmudflap.c/fail11-frag.c
+++ b/libmudflap/testsuite/libmudflap.c/fail11-frag.c
@@ -1,11 +1,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+char *y;
 int main ()
 {
 int i = 10;
 char *x = (char *) malloc (i * sizeof (char));
-
+y = x;
 while (i--)
 {
   ++x;
diff --git a/libmudflap/testsuite/libmudflap.c/fail12-frag.c b/libmudflap/testsuite/libmudflap.c/fail12-frag.c
index da8bfb7c046..46dbdb23642 100644
--- a/libmudflap/testsuite/libmudflap.c/fail12-frag.c
+++ b/libmudflap/testsuite/libmudflap.c/fail12-frag.c
@@ -1,11 +1,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+int *y;
 int main ()
 {
 int i = 10;
 int *x = (int *) malloc (i * sizeof (int));
-
+y = x;
 while (i--)
 {
   ++x;
diff --git a/libmudflap/testsuite/libmudflap.c/fail16-frag.c b/libmudflap/testsuite/libmudflap.c/fail16-frag.c
index 317e2744731..6ac6187e2ad 100644
--- a/libmudflap/testsuite/libmudflap.c/fail16-frag.c
+++ b/libmudflap/testsuite/libmudflap.c/fail16-frag.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+void *p;
 int main ()
 {
 struct base {
@@ -15,7 +16,7 @@ struct derived {
 struct base *bp;
 
 bp = (struct base *) malloc (sizeof (struct base));;
-
+p = bp;
 bp->basic = 10;
 ((struct derived *)bp)->extra = 'x';
 return 0;
diff --git a/libmudflap/testsuite/libmudflap.c/fail31-frag.c b/libmudflap/testsuite/libmudflap.c/fail31-frag.c
index b15056c970c..bd9a903ccfd 100644
--- a/libmudflap/testsuite/libmudflap.c/fail31-frag.c
+++ b/libmudflap/testsuite/libmudflap.c/fail31-frag.c
@@ -8,11 +8,12 @@ int main ()
   int z = h (4, 10);
   return 0;
 }
-
+int *p;
 int h (int i, int j)
 {
   int k[i];
   k[j] = i;
+  p = k;
   return j;
 }