diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 70571cd4b58..b0d92ae1965 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2012-05-18  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/53346
+	* tree-loop-distribution.c (ldist_gen): Make sure to apply
+	builtin transform even when only a single partition with
+	all reads/writes exists.
+
 2012-05-18  Richard Guenther  <rguenther@suse.de>
 
 	PR tree-optimization/53390
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index d5dfbd184b8..87941bd7aa5 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2012-05-18  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/53346
+	* gcc.dg/tree-ssa/ldist-18.c: New testcase.
+	* gcc.target/i386/incoming-10.c: Adjust.
+	* gcc.target/i386/incoming-11.c: Likewise.
+	* gcc.target/i386/pr46295.c: Likewise.
+
 2012-05-18  Richard Guenther  <rguenther@suse.de>
 
 	* gcc.dg/pr53352.c: Return zero.
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ldist-18.c b/gcc/testsuite/gcc.dg/tree-ssa/ldist-18.c
new file mode 100644
index 00000000000..893ab8b703b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/ldist-18.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-loop-distribute-patterns -fdump-tree-ldist-details" } */
+
+void foo (int *p, int n)
+{
+  int i;
+  for (i = 0; i < n; ++i)
+    p[i] = 0;
+}
+
+/* { dg-final { scan-tree-dump "generated memset zero" "ldist" } } */
+/* { dg-final { cleanup-tree-dump "ldist" } } */
diff --git a/gcc/testsuite/gcc.target/i386/incoming-10.c b/gcc/testsuite/gcc.target/i386/incoming-10.c
index 1fb9ef4f0f9..612fa720888 100644
--- a/gcc/testsuite/gcc.target/i386/incoming-10.c
+++ b/gcc/testsuite/gcc.target/i386/incoming-10.c
@@ -12,7 +12,7 @@ void f()
 {
 	int i;
 	struct s s;
-	for (i = 0; i < sizeof(s.x) / sizeof(*s.x); i++) s.x[i] = 0;
+	for (i = 0; i < sizeof(s.x) / sizeof(*s.x); i++) s.x[i] = 1;
 	g(&s);
 }
 
diff --git a/gcc/testsuite/gcc.target/i386/incoming-11.c b/gcc/testsuite/gcc.target/i386/incoming-11.c
index a7b7db53aa8..a830c96f7d1 100644
--- a/gcc/testsuite/gcc.target/i386/incoming-11.c
+++ b/gcc/testsuite/gcc.target/i386/incoming-11.c
@@ -10,9 +10,9 @@ int q[100];
 void f()
 {
 	int i;
-	for (i = 0; i < 100; i++) p[i] = 0;
+	for (i = 0; i < 100; i++) p[i] = 1;
 	g();
-	for (i = 0; i < 100; i++) q[i] = 0;
+	for (i = 0; i < 100; i++) q[i] = 1;
 }
 
 /* { dg-final { scan-assembler "andl\[\\t \]*\\$-16,\[\\t \]*%esp" } } */
diff --git a/gcc/testsuite/gcc.target/i386/pr46295.c b/gcc/testsuite/gcc.target/i386/pr46295.c
index b7fccb7fb34..4ac7c101abb 100644
--- a/gcc/testsuite/gcc.target/i386/pr46295.c
+++ b/gcc/testsuite/gcc.target/i386/pr46295.c
@@ -9,7 +9,7 @@ void Parse_Vector ()
    EXPRESS Express;
    int Terms;
    for (Terms = 0; Terms < 5; Terms++)
-     Express[Terms] = 0.0;
+     Express[Terms] = 1.0;
    Parse_Rel_Factor(Express,&Terms);
 }
 
diff --git a/gcc/tree-loop-distribution.c b/gcc/tree-loop-distribution.c
index 0d21763c72e..d7506e69b04 100644
--- a/gcc/tree-loop-distribution.c
+++ b/gcc/tree-loop-distribution.c
@@ -1131,8 +1131,11 @@ ldist_gen (struct loop *loop, struct graph *rdg,
   BITMAP_FREE (processed);
   nbp = VEC_length (bitmap, partitions);
 
-  if (nbp <= 1
-      || partition_contains_all_rw (rdg, partitions))
+  if (nbp == 0
+      || (nbp == 1
+	  && !can_generate_builtin (rdg, VEC_index (bitmap, partitions, 0)))
+      || (nbp > 1
+	  && partition_contains_all_rw (rdg, partitions)))
     goto ldist_done;
 
   if (dump_file && (dump_flags & TDF_DETAILS))