PR target/67089

	* tree-ssa-math-opts.c (uaddsub_overflow_check_p,
	match_uaddsub_overflow): New functions.
	(pass_optimize_widening_mul::execute): Call match_uaddsub_overflow.

	* gcc.dg/pr67089-1.c: New test.
	* gcc.dg/pr67089-2.c: New test.
	* gcc.dg/pr67089-3.c: New test.
	* gcc.dg/pr67089-4.c: New test.
	* gcc.dg/pr67089-5.c: New test.
	* gcc.dg/pr67089-6.c: New test.
	* gcc.dg/pr67089-7.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@230856 138bc75d-0d04-0410-961f-82ee72b054a4

10 files changed, 857 insertions, 1 deletions

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 28def7d3e3a..9504817e269 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2015-11-25  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/67089
+	* tree-ssa-math-opts.c (uaddsub_overflow_check_p,
+	match_uaddsub_overflow): New functions.
+	(pass_optimize_widening_mul::execute): Call match_uaddsub_overflow.
+
 2015-11-25  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/68492
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index ec80893ee43..ac85edf1b99 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,14 @@
+2015-11-25  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/67089
+	* gcc.dg/pr67089-1.c: New test.
+	* gcc.dg/pr67089-2.c: New test.
+	* gcc.dg/pr67089-3.c: New test.
+	* gcc.dg/pr67089-4.c: New test.
+	* gcc.dg/pr67089-5.c: New test.
+	* gcc.dg/pr67089-6.c: New test.
+	* gcc.dg/pr67089-7.c: New test.
+
 2015-11-25  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/68502
diff --git a/gcc/testsuite/gcc.dg/pr67089-1.c b/gcc/testsuite/gcc.dg/pr67089-1.c
new file mode 100644
index 00000000000..e26474977da
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr67089-1.c
@@ -0,0 +1,112 @@
+/* PR target/67089 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+extern void abort (void);
+
+int cnt, d;
+
+__attribute__((noinline, noclone))
+void foo (int x)
+{
+  asm volatile ("" : "+m" (d) : "g" (x) : "memory");
+  cnt++;
+}
+
+#define T(n, type, op, cond) \
+__attribute__((noinline, noclone))	\
+type					\
+f##n (type x, type y)			\
+{					\
+  type r = op;				\
+  cond;					\
+  return r;				\
+}
+
+T (1, unsigned int, x - y, if (r > x) foo (0))
+T (2, unsigned long, x - y, if (r <= x) foo (0))
+T (3, unsigned short, x - y, if (x < r) foo (r))
+T (4, unsigned long long, x - y, if (x >= r) foo (0))
+T (5, unsigned int, x - y, if (r >= x) foo (0))
+T (6, unsigned long, x - y, if (r < x) foo (0))
+T (7, unsigned short, x - y, if (x <= r) foo (r))
+T (8, unsigned long long, x - y, if (d || x > r) foo (0))
+T (9, unsigned int, x - y, if (d || r > x) foo (0))
+T (10, unsigned long, x - y, if (d || r <= x) foo (0))
+T (11, unsigned char, x - y, if (d || x < r) foo (0))
+T (12, unsigned long long, x - y, if (d || x >= r) foo (0))
+T (13, unsigned int, x - y, if (d || r >= x) foo (0))
+T (14, unsigned long, x - y, if (d || r < x) foo (0))
+T (15, unsigned short, x - y, if (d || x <= r) foo (0))
+T (16, unsigned long long, x - y, if (d || x > r) foo (0))
+
+int
+main ()
+{
+  if (f1 (5, 3) != 2U || cnt != 0) abort ();
+  if (f1 (5, 7) != -2U || cnt != 1) abort ();
+  if (f1 (5, 5) != 0U || cnt != 1) abort ();
+  if (f1 (5, 0) != 5U || cnt != 1) abort ();
+  if (f2 (7, 1) != 6UL || cnt != 2) abort ();
+  if (f2 (7, 8) != -1UL || cnt != 2) abort ();
+  if (f2 (9, 9) != 0UL || cnt != 3) abort ();
+  if (f2 (9, 0) != 9UL || cnt != 4) abort ();
+  if (f3 (15, 14) != 1 || cnt != 4) abort ();
+  if (f3 (15, 25) != (unsigned short) -10 || cnt != 5) abort ();
+  if (f3 (15, 15) != 0 || cnt != 5) abort ();
+  if (f3 (15, 0) != 15 || cnt != 5) abort ();
+  if (f4 (9132, 9127) != 5ULL || cnt != 6) abort ();
+  if (f4 (9132, 9137) != -5ULL || cnt != 6) abort ();
+  if (f4 (9132, 9132) != 0 || cnt != 7) abort ();
+  if (f4 (9132, 0) != 9132ULL || cnt != 8) abort ();
+  if (f5 (5, 3) != 2U || cnt != 8) abort ();
+  if (f5 (5, 7) != -2U || cnt != 9) abort ();
+  if (f5 (5, 5) != 0U || cnt != 9) abort ();
+  if (f5 (5, 0) != 5U || cnt != 10) abort ();
+  if (f6 (7, 1) != 6UL || cnt != 11) abort ();
+  if (f6 (7, 8) != -1UL || cnt != 11) abort ();
+  if (f6 (9, 9) != 0UL || cnt != 12) abort ();
+  if (f6 (9, 0) != 9UL || cnt != 12) abort ();
+  if (f7 (15, 14) != 1 || cnt != 12) abort ();
+  if (f7 (15, 25) != (unsigned short) -10 || cnt != 13) abort ();
+  if (f7 (15, 15) != 0 || cnt != 13) abort ();
+  if (f7 (15, 0) != 15 || cnt != 14) abort ();
+  if (f8 (9132, 9127) != 5ULL || cnt != 15) abort ();
+  if (f8 (9132, 9137) != -5ULL || cnt != 15) abort ();
+  if (f8 (9132, 9132) != 0 || cnt != 16) abort ();
+  if (f8 (9132, 0) != 9132ULL || cnt != 16) abort ();
+  cnt = 0;
+  if (f9 (5, 3) != 2U || cnt != 0) abort ();
+  if (f9 (5, 7) != -2U || cnt != 1) abort ();
+  if (f9 (5, 5) != 0U || cnt != 1) abort ();
+  if (f9 (5, 0) != 5U || cnt != 1) abort ();
+  if (f10 (7, 1) != 6UL || cnt != 2) abort ();
+  if (f10 (7, 8) != -1UL || cnt != 2) abort ();
+  if (f10 (9, 9) != 0UL || cnt != 3) abort ();
+  if (f10 (9, 0) != 9UL || cnt != 4) abort ();
+  if (f11 (15, 14) != 1 || cnt != 4) abort ();
+  if (f11 (15, 25) != (unsigned char) -10 || cnt != 5) abort ();
+  if (f11 (15, 15) != 0 || cnt != 5) abort ();
+  if (f11 (15, 0) != 15 || cnt != 5) abort ();
+  if (f12 (9132, 9127) != 5ULL || cnt != 6) abort ();
+  if (f12 (9132, 9137) != -5ULL || cnt != 6) abort ();
+  if (f12 (9132, 9132) != 0 || cnt != 7) abort ();
+  if (f12 (9132, 0) != 9132ULL || cnt != 8) abort ();
+  if (f13 (5, 3) != 2U || cnt != 8) abort ();
+  if (f13 (5, 7) != -2U || cnt != 9) abort ();
+  if (f13 (5, 5) != 0U || cnt != 9) abort ();
+  if (f13 (5, 0) != 5U || cnt != 10) abort ();
+  if (f14 (7, 1) != 6UL || cnt != 11) abort ();
+  if (f14 (7, 8) != -1UL || cnt != 11) abort ();
+  if (f14 (9, 9) != 0UL || cnt != 12) abort ();
+  if (f14 (9, 0) != 9UL || cnt != 12) abort ();
+  if (f15 (15, 14) != 1 || cnt != 12) abort ();
+  if (f15 (15, 25) != (unsigned short) -10 || cnt != 13) abort ();
+  if (f15 (15, 15) != 0 || cnt != 13) abort ();
+  if (f15 (15, 0) != 15 || cnt != 14) abort ();
+  if (f16 (9132, 9127) != 5ULL || cnt != 15) abort ();
+  if (f16 (9132, 9137) != -5ULL || cnt != 15) abort ();
+  if (f16 (9132, 9132) != 0 || cnt != 16) abort ();
+  if (f16 (9132, 0) != 9132ULL || cnt != 16) abort ();
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.dg/pr67089-2.c b/gcc/testsuite/gcc.dg/pr67089-2.c
new file mode 100644
index 00000000000..59b27a7d686
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr67089-2.c
@@ -0,0 +1,112 @@
+/* PR target/67089 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+extern void abort (void);
+
+int cnt, d;
+
+__attribute__((noinline, noclone))
+void foo (int x)
+{
+  asm volatile ("" : "+m" (d) : "g" (x) : "memory");
+  cnt++;
+}
+
+#define T(n, type, op, cond) \
+__attribute__((noinline, noclone))	\
+type					\
+f##n (type x, type y)			\
+{					\
+  type r = op;				\
+  cond;					\
+  return r;				\
+}
+
+T (1, unsigned int, x - y, if (r > y) foo (0))
+T (2, unsigned long, x - y, if (r <= y) foo (0))
+T (3, unsigned short, x - y, if (y < r) foo (r))
+T (4, unsigned long long, x - y, if (y >= r) foo (0))
+T (5, unsigned int, x - y, if (r >= y) foo (0))
+T (6, unsigned long, x - y, if (r < y) foo (0))
+T (7, unsigned short, x - y, if (y <= r) foo (r))
+T (8, unsigned long long, x - y, if (d || y > r) foo (0))
+T (9, unsigned int, x - y, if (d || r > y) foo (0))
+T (10, unsigned long, x - y, if (d || r <= y) foo (0))
+T (11, unsigned char, x - y, if (d || y < r) foo (0))
+T (12, unsigned long long, x - y, if (d || y >= r) foo (0))
+T (13, unsigned int, x - y, if (d || r >= y) foo (0))
+T (14, unsigned long, x - y, if (d || r < y) foo (0))
+T (15, unsigned short, x - y, if (d || y <= r) foo (0))
+T (16, unsigned long long, x - y, if (d || y > r) foo (0))
+
+int
+main ()
+{
+  if (f1 (5, 3) != 2U || cnt != 0) abort ();
+  if (f1 (5, 7) != -2U || cnt != 1) abort ();
+  if (f1 (5, 5) != 0U || cnt != 1) abort ();
+  if (f1 (5, 0) != 5U || cnt != 2) abort ();
+  if (f2 (7, 1) != 6UL || cnt != 2) abort ();
+  if (f2 (7, 8) != -1UL || cnt != 2) abort ();
+  if (f2 (9, 9) != 0UL || cnt != 3) abort ();
+  if (f2 (9, 0) != 9UL || cnt != 3) abort ();
+  if (f3 (15, 14) != 1 || cnt != 3) abort ();
+  if (f3 (15, 25) != (unsigned short) -10 || cnt != 4) abort ();
+  if (f3 (15, 15) != 0 || cnt != 4) abort ();
+  if (f3 (15, 0) != 15 || cnt != 5) abort ();
+  if (f4 (9132, 9127) != 5ULL || cnt != 6) abort ();
+  if (f4 (9132, 9137) != -5ULL || cnt != 6) abort ();
+  if (f4 (9132, 9132) != 0 || cnt != 7) abort ();
+  if (f4 (9132, 0) != 9132ULL || cnt != 7) abort ();
+  if (f5 (5, 3) != 2U || cnt != 7) abort ();
+  if (f5 (5, 7) != -2U || cnt != 8) abort ();
+  if (f5 (5, 5) != 0U || cnt != 8) abort ();
+  if (f5 (5, 0) != 5U || cnt != 9) abort ();
+  if (f6 (7, 1) != 6UL || cnt != 9) abort ();
+  if (f6 (7, 8) != -1UL || cnt != 9) abort ();
+  if (f6 (9, 9) != 0UL || cnt != 10) abort ();
+  if (f6 (9, 0) != 9UL || cnt != 10) abort ();
+  if (f7 (15, 14) != 1 || cnt != 10) abort ();
+  if (f7 (15, 25) != (unsigned short) -10 || cnt != 11) abort ();
+  if (f7 (15, 15) != 0 || cnt != 11) abort ();
+  if (f7 (15, 0) != 15 || cnt != 12) abort ();
+  if (f8 (9132, 9127) != 5ULL || cnt != 13) abort ();
+  if (f8 (9132, 9137) != -5ULL || cnt != 13) abort ();
+  if (f8 (9132, 9132) != 0 || cnt != 14) abort ();
+  if (f8 (9132, 0) != 9132ULL || cnt != 14) abort ();
+  cnt = 0;
+  if (f9 (5, 3) != 2U || cnt != 0) abort ();
+  if (f9 (5, 7) != -2U || cnt != 1) abort ();
+  if (f9 (5, 5) != 0U || cnt != 1) abort ();
+  if (f9 (5, 0) != 5U || cnt != 2) abort ();
+  if (f10 (7, 1) != 6UL || cnt != 2) abort ();
+  if (f10 (7, 8) != -1UL || cnt != 2) abort ();
+  if (f10 (9, 9) != 0UL || cnt != 3) abort ();
+  if (f10 (9, 0) != 9UL || cnt != 3) abort ();
+  if (f11 (15, 14) != 1 || cnt != 3) abort ();
+  if (f11 (15, 25) != (unsigned char) -10 || cnt != 4) abort ();
+  if (f11 (15, 15) != 0 || cnt != 4) abort ();
+  if (f11 (15, 0) != 15 || cnt != 5) abort ();
+  if (f12 (9132, 9127) != 5ULL || cnt != 6) abort ();
+  if (f12 (9132, 9137) != -5ULL || cnt != 6) abort ();
+  if (f12 (9132, 9132) != 0 || cnt != 7) abort ();
+  if (f12 (9132, 0) != 9132ULL || cnt != 7) abort ();
+  if (f13 (5, 3) != 2U || cnt != 7) abort ();
+  if (f13 (5, 7) != -2U || cnt != 8) abort ();
+  if (f13 (5, 5) != 0U || cnt != 8) abort ();
+  if (f13 (5, 0) != 5U || cnt != 9) abort ();
+  if (f14 (7, 1) != 6UL || cnt != 9) abort ();
+  if (f14 (7, 8) != -1UL || cnt != 9) abort ();
+  if (f14 (9, 9) != 0UL || cnt != 10) abort ();
+  if (f14 (9, 0) != 9UL || cnt != 10) abort ();
+  if (f15 (15, 14) != 1 || cnt != 10) abort ();
+  if (f15 (15, 25) != (unsigned short) -10 || cnt != 11) abort ();
+  if (f15 (15, 15) != 0 || cnt != 11) abort ();
+  if (f15 (15, 0) != 15 || cnt != 12) abort ();
+  if (f16 (9132, 9127) != 5ULL || cnt != 13) abort ();
+  if (f16 (9132, 9137) != -5ULL || cnt != 13) abort ();
+  if (f16 (9132, 9132) != 0 || cnt != 14) abort ();
+  if (f16 (9132, 0) != 9132ULL || cnt != 14) abort ();
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.dg/pr67089-3.c b/gcc/testsuite/gcc.dg/pr67089-3.c
new file mode 100644
index 00000000000..22576e56cbf
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr67089-3.c
@@ -0,0 +1,112 @@
+/* PR target/67089 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+extern void abort (void);
+
+int cnt, d;
+
+__attribute__((noinline, noclone))
+void foo (int x)
+{
+  asm volatile ("" : "+m" (d) : "g" (x) : "memory");
+  cnt++;
+}
+
+#define T(n, type, op, cond) \
+__attribute__((noinline, noclone))	\
+type					\
+f##n (type x, type y)			\
+{					\
+  type r = op;				\
+  cond;					\
+  return r;				\
+}
+
+T (1, unsigned int, x + y, if (r > x) foo (0))
+T (2, unsigned long, x + y, if (r <= x) foo (0))
+T (3, unsigned short, x + y, if (x < r) foo (r))
+T (4, unsigned long long, x + y, if (x >= r) foo (0))
+T (5, unsigned int, x + y, if (r >= x) foo (0))
+T (6, unsigned long, x + y, if (r < x) foo (0))
+T (7, unsigned short, x + y, if (x <= r) foo (r))
+T (8, unsigned long long, x + y, if (d || x > r) foo (0))
+T (9, unsigned int, x + y, if (d || r > x) foo (0))
+T (10, unsigned long, x + y, if (d || r <= x) foo (0))
+T (11, unsigned char, x + y, if (d || x < r) foo (0))
+T (12, unsigned long long, x + y, if (d || x >= r) foo (0))
+T (13, unsigned int, x + y, if (d || r >= x) foo (0))
+T (14, unsigned long, x + y, if (d || r < x) foo (0))
+T (15, unsigned short, x + y, if (d || x <= r) foo (0))
+T (16, unsigned long long, x + y, if (d || x > r) foo (0))
+
+int
+main ()
+{
+  if (f1 (-7U, 0) != -7U || cnt != 0) abort ();
+  if (f1 (-7U, 6) != -1U || cnt != 1) abort ();
+  if (f1 (-7U, 7) != 0U || cnt != 1) abort ();
+  if (f1 (-7U, 8) != 1U || cnt != 1) abort ();
+  if (f2 (-9UL, 0) != -9UL || cnt != 2) abort ();
+  if (f2 (-9UL, 8) != -1UL || cnt != 2) abort ();
+  if (f2 (-9UL, 9) != 0UL || cnt != 3) abort ();
+  if (f2 (-9UL, 10) != 1UL || cnt != 4) abort ();
+  if (f3 (-15, 0) != (unsigned short) -15 || cnt != 4) abort ();
+  if (f3 (-15, 14) != (unsigned short) -1 || cnt != 5) abort ();
+  if (f3 (-15, 15) != 0 || cnt != 5) abort ();
+  if (f3 (-15, 16) != 1 || cnt != 5) abort ();
+  if (f4 (-9132ULL, 0) != -9132ULL || cnt != 6) abort ();
+  if (f4 (-9132ULL, 9131) != -1ULL || cnt != 6) abort ();
+  if (f4 (-9132ULL, 9132) != 0 || cnt != 7) abort ();
+  if (f4 (-9132ULL, 9133) != 1ULL || cnt != 8) abort ();
+  if (f5 (-7U, 0) != -7U || cnt != 9) abort ();
+  if (f5 (-7U, 6) != -1U || cnt != 10) abort ();
+  if (f5 (-7U, 7) != 0U || cnt != 10) abort ();
+  if (f5 (-7U, 8) != 1U || cnt != 10) abort ();
+  if (f6 (-9UL, 0) != -9UL || cnt != 10) abort ();
+  if (f6 (-9UL, 8) != -1UL || cnt != 10) abort ();
+  if (f6 (-9UL, 9) != 0UL || cnt != 11) abort ();
+  if (f6 (-9UL, 10) != 1UL || cnt != 12) abort ();
+  if (f7 (-15, 0) != (unsigned short) -15 || cnt != 13) abort ();
+  if (f7 (-15, 14) != (unsigned short) -1 || cnt != 14) abort ();
+  if (f7 (-15, 15) != 0 || cnt != 14) abort ();
+  if (f7 (-15, 16) != 1 || cnt != 14) abort ();
+  if (f8 (-9132ULL, 0) != -9132ULL || cnt != 14) abort ();
+  if (f8 (-9132ULL, 9131) != -1ULL || cnt != 14) abort ();
+  if (f8 (-9132ULL, 9132) != 0 || cnt != 15) abort ();
+  if (f8 (-9132ULL, 9133) != 1ULL || cnt != 16) abort ();
+  cnt = 0;
+  if (f9 (-7U, 0) != -7U || cnt != 0) abort ();
+  if (f9 (-7U, 6) != -1U || cnt != 1) abort ();
+  if (f9 (-7U, 7) != 0U || cnt != 1) abort ();
+  if (f9 (-7U, 8) != 1U || cnt != 1) abort ();
+  if (f10 (-9UL, 0) != -9UL || cnt != 2) abort ();
+  if (f10 (-9UL, 8) != -1UL || cnt != 2) abort ();
+  if (f10 (-9UL, 9) != 0UL || cnt != 3) abort ();
+  if (f10 (-9UL, 10) != 1UL || cnt != 4) abort ();
+  if (f11 (-15, 0) != (unsigned char) -15 || cnt != 4) abort ();
+  if (f11 (-15, 14) != (unsigned char) -1 || cnt != 5) abort ();
+  if (f11 (-15, 15) != 0 || cnt != 5) abort ();
+  if (f11 (-15, 16) != 1 || cnt != 5) abort ();
+  if (f12 (-9132ULL, 0) != -9132ULL || cnt != 6) abort ();
+  if (f12 (-9132ULL, 9131) != -1ULL || cnt != 6) abort ();
+  if (f12 (-9132ULL, 9132) != 0 || cnt != 7) abort ();
+  if (f12 (-9132ULL, 9133) != 1ULL || cnt != 8) abort ();
+  if (f13 (-7U, 0) != -7U || cnt != 9) abort ();
+  if (f13 (-7U, 6) != -1U || cnt != 10) abort ();
+  if (f13 (-7U, 7) != 0U || cnt != 10) abort ();
+  if (f13 (-7U, 8) != 1U || cnt != 10) abort ();
+  if (f14 (-9UL, 0) != -9UL || cnt != 10) abort ();
+  if (f14 (-9UL, 8) != -1UL || cnt != 10) abort ();
+  if (f14 (-9UL, 9) != 0UL || cnt != 11) abort ();
+  if (f14 (-9UL, 10) != 1UL || cnt != 12) abort ();
+  if (f15 (-15, 0) != (unsigned short) -15 || cnt != 13) abort ();
+  if (f15 (-15, 14) != (unsigned short) -1 || cnt != 14) abort ();
+  if (f15 (-15, 15) != 0 || cnt != 14) abort ();
+  if (f15 (-15, 16) != 1 || cnt != 14) abort ();
+  if (f16 (-9132ULL, 0) != -9132ULL || cnt != 14) abort ();
+  if (f16 (-9132ULL, 9131) != -1ULL || cnt != 14) abort ();
+  if (f16 (-9132ULL, 9132) != 0 || cnt != 15) abort ();
+  if (f16 (-9132ULL, 9133) != 1ULL || cnt != 16) abort ();
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.dg/pr67089-4.c b/gcc/testsuite/gcc.dg/pr67089-4.c
new file mode 100644
index 00000000000..f4f7439f9d5
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr67089-4.c
@@ -0,0 +1,112 @@
+/* PR target/67089 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+extern void abort (void);
+
+int cnt, d;
+
+__attribute__((noinline, noclone))
+void foo (int x)
+{
+  asm volatile ("" : "+m" (d) : "g" (x) : "memory");
+  cnt++;
+}
+
+#define T(n, type, op, cond) \
+__attribute__((noinline, noclone))	\
+type					\
+f##n (type x, type y)			\
+{					\
+  type r = op;				\
+  cond;					\
+  return r;				\
+}
+
+T (1, unsigned int, x + y, if (r > y) foo (0))
+T (2, unsigned long, x + y, if (r <= y) foo (0))
+T (3, unsigned short, x + y, if (y < r) foo (r))
+T (4, unsigned long long, x + y, if (y >= r) foo (0))
+T (5, unsigned int, x + y, if (r >= y) foo (0))
+T (6, unsigned long, x + y, if (r < y) foo (0))
+T (7, unsigned short, x + y, if (y <= r) foo (r))
+T (8, unsigned long long, x + y, if (d || y > r) foo (0))
+T (9, unsigned int, x + y, if (d || r > y) foo (0))
+T (10, unsigned long, x + y, if (d || r <= y) foo (0))
+T (11, unsigned char, x + y, if (d || y < r) foo (0))
+T (12, unsigned long long, x + y, if (d || y >= r) foo (0))
+T (13, unsigned int, x + y, if (d || r >= y) foo (0))
+T (14, unsigned long, x + y, if (d || r < y) foo (0))
+T (15, unsigned short, x + y, if (d || y <= r) foo (0))
+T (16, unsigned long long, x + y, if (d || y > r) foo (0))
+
+int
+main ()
+{
+  if (f1 (-7U, 0) != -7U || cnt != 1) abort ();
+  if (f1 (-7U, 6) != -1U || cnt != 2) abort ();
+  if (f1 (-7U, 7) != 0U || cnt != 2) abort ();
+  if (f1 (-7U, 8) != 1U || cnt != 2) abort ();
+  if (f2 (-9UL, 0) != -9UL || cnt != 2) abort ();
+  if (f2 (-9UL, 8) != -1UL || cnt != 2) abort ();
+  if (f2 (-9UL, 9) != 0UL || cnt != 3) abort ();
+  if (f2 (-9UL, 10) != 1UL || cnt != 4) abort ();
+  if (f3 (-15, 0) != (unsigned short) -15 || cnt != 5) abort ();
+  if (f3 (-15, 14) != (unsigned short) -1 || cnt != 6) abort ();
+  if (f3 (-15, 15) != 0 || cnt != 6) abort ();
+  if (f3 (-15, 16) != 1 || cnt != 6) abort ();
+  if (f4 (-9132ULL, 0) != -9132ULL || cnt != 6) abort ();
+  if (f4 (-9132ULL, 9131) != -1ULL || cnt != 6) abort ();
+  if (f4 (-9132ULL, 9132) != 0 || cnt != 7) abort ();
+  if (f4 (-9132ULL, 9133) != 1ULL || cnt != 8) abort ();
+  if (f5 (-7U, 0) != -7U || cnt != 9) abort ();
+  if (f5 (-7U, 6) != -1U || cnt != 10) abort ();
+  if (f5 (-7U, 7) != 0U || cnt != 10) abort ();
+  if (f5 (-7U, 8) != 1U || cnt != 10) abort ();
+  if (f6 (-9UL, 0) != -9UL || cnt != 10) abort ();
+  if (f6 (-9UL, 8) != -1UL || cnt != 10) abort ();
+  if (f6 (-9UL, 9) != 0UL || cnt != 11) abort ();
+  if (f6 (-9UL, 10) != 1UL || cnt != 12) abort ();
+  if (f7 (-15, 0) != (unsigned short) -15 || cnt != 13) abort ();
+  if (f7 (-15, 14) != (unsigned short) -1 || cnt != 14) abort ();
+  if (f7 (-15, 15) != 0 || cnt != 14) abort ();
+  if (f7 (-15, 16) != 1 || cnt != 14) abort ();
+  if (f8 (-9132ULL, 0) != -9132ULL || cnt != 14) abort ();
+  if (f8 (-9132ULL, 9131) != -1ULL || cnt != 14) abort ();
+  if (f8 (-9132ULL, 9132) != 0 || cnt != 15) abort ();
+  if (f8 (-9132ULL, 9133) != 1ULL || cnt != 16) abort ();
+  cnt = 0;
+  if (f9 (-7U, 0) != -7U || cnt != 1) abort ();
+  if (f9 (-7U, 6) != -1U || cnt != 2) abort ();
+  if (f9 (-7U, 7) != 0U || cnt != 2) abort ();
+  if (f9 (-7U, 8) != 1U || cnt != 2) abort ();
+  if (f10 (-9UL, 0) != -9UL || cnt != 2) abort ();
+  if (f10 (-9UL, 8) != -1UL || cnt != 2) abort ();
+  if (f10 (-9UL, 9) != 0UL || cnt != 3) abort ();
+  if (f10 (-9UL, 10) != 1UL || cnt != 4) abort ();
+  if (f11 (-15, 0) != (unsigned char) -15 || cnt != 5) abort ();
+  if (f11 (-15, 14) != (unsigned char) -1 || cnt != 6) abort ();
+  if (f11 (-15, 15) != 0 || cnt != 6) abort ();
+  if (f11 (-15, 16) != 1 || cnt != 6) abort ();
+  if (f12 (-9132ULL, 0) != -9132ULL || cnt != 6) abort ();
+  if (f12 (-9132ULL, 9131) != -1ULL || cnt != 6) abort ();
+  if (f12 (-9132ULL, 9132) != 0 || cnt != 7) abort ();
+  if (f12 (-9132ULL, 9133) != 1ULL || cnt != 8) abort ();
+  if (f13 (-7U, 0) != -7U || cnt != 9) abort ();
+  if (f13 (-7U, 6) != -1U || cnt != 10) abort ();
+  if (f13 (-7U, 7) != 0U || cnt != 10) abort ();
+  if (f13 (-7U, 8) != 1U || cnt != 10) abort ();
+  if (f14 (-9UL, 0) != -9UL || cnt != 10) abort ();
+  if (f14 (-9UL, 8) != -1UL || cnt != 10) abort ();
+  if (f14 (-9UL, 9) != 0UL || cnt != 11) abort ();
+  if (f14 (-9UL, 10) != 1UL || cnt != 12) abort ();
+  if (f15 (-15, 0) != (unsigned short) -15 || cnt != 13) abort ();
+  if (f15 (-15, 14) != (unsigned short) -1 || cnt != 14) abort ();
+  if (f15 (-15, 15) != 0 || cnt != 14) abort ();
+  if (f15 (-15, 16) != 1 || cnt != 14) abort ();
+  if (f16 (-9132ULL, 0) != -9132ULL || cnt != 14) abort ();
+  if (f16 (-9132ULL, 9131) != -1ULL || cnt != 14) abort ();
+  if (f16 (-9132ULL, 9132) != 0 || cnt != 15) abort ();
+  if (f16 (-9132ULL, 9133) != 1ULL || cnt != 16) abort ();
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.dg/pr67089-5.c b/gcc/testsuite/gcc.dg/pr67089-5.c
new file mode 100644
index 00000000000..f937375737e
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr67089-5.c
@@ -0,0 +1,82 @@
+/* PR target/67089 */
+/* { dg-do run } */
+/* { dg-options "-O2 -ftree-loop-if-convert" } */
+
+extern void abort (void);
+
+int cnt;
+unsigned int a[16], b[16], c[16];
+
+__attribute__((noinline, noclone))
+void foo (int x)
+{
+  asm volatile ("" : : "g" (x) : "memory");
+  cnt++;
+}
+
+__attribute__((noinline, noclone)) void
+f0 (unsigned int x)
+{
+  for (int i = 0; i < 16; i++)
+    {
+      unsigned int r = x - a[i];
+      b[i] = r;
+      c[i] = r > x ? 7 : x;
+    }
+}
+
+#define T(n, type, op, cond) \
+__attribute__((noinline, noclone))	\
+type					\
+f##n (type x)				\
+{					\
+  type r = op;				\
+  cond;					\
+  return r;				\
+}
+
+T (1, unsigned int, x - 2U, if (r > x) foo (0))
+T (2, unsigned long, x - 2U, if (r <= x) foo (0))
+T (3, unsigned short, 2U - x, if (r > 2U) foo (0))
+T (4, unsigned char, 2U - x, if (r <= 2U) foo (0))
+T (5, unsigned int, x + -2U, if (r > x) foo (0))
+T (6, unsigned long, x + -2UL, if (r <= x) foo (0))
+T (7, unsigned short, (unsigned short) -2 + x, if (r > (unsigned short) -2) foo (0))
+T (8, unsigned char, (unsigned char) -2 + x, if (r <= (unsigned char) -2) foo (0))
+
+int
+main ()
+{
+  int i;
+  for (i = 0; i < 16; i++)
+    a[i] = i - 7;
+  f0 (5);
+  for (i = 0; i < 16; i++)
+    if (b[i] != 12U - i || c[i] != 7 - 2 * (i >= 7 && i < 13))
+      abort ();
+  if (f1 (3) != 1 || cnt != 0) abort ();
+  if (f1 (2) != 0 || cnt != 0) abort ();
+  if (f1 (1) != -1U || cnt != 1) abort ();
+  if (f2 (3) != 1 || cnt != 2) abort ();
+  if (f2 (2) != 0 || cnt != 3) abort ();
+  if (f2 (1) != -1UL || cnt != 3) abort ();
+  if (f3 (3) != (unsigned short) -1 || cnt != 4) abort ();
+  if (f3 (2) != 0 || cnt != 4) abort ();
+  if (f3 (1) != 1 || cnt != 4) abort ();
+  if (f4 (3) != (unsigned char) -1 || cnt != 4) abort ();
+  if (f4 (2) != 0 || cnt != 5) abort ();
+  if (f4 (1) != 1 || cnt != 6) abort ();
+  if (f5 (3) != 1 || cnt != 6) abort ();
+  if (f5 (2) != 0 || cnt != 6) abort ();
+  if (f5 (1) != -1U || cnt != 7) abort ();
+  if (f6 (3) != 1 || cnt != 8) abort ();
+  if (f6 (2) != 0 || cnt != 9) abort ();
+  if (f6 (1) != -1UL || cnt != 9) abort ();
+  if (f7 (3) != 1 || cnt != 9) abort ();
+  if (f7 (2) != 0 || cnt != 9) abort ();
+  if (f7 (1) != (unsigned short) -1 || cnt != 10) abort ();
+  if (f8 (3) != 1 || cnt != 11) abort ();
+  if (f8 (2) != 0 || cnt != 12) abort ();
+  if (f8 (1) != (unsigned char) -1 || cnt != 12) abort ();
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.dg/pr67089-6.c b/gcc/testsuite/gcc.dg/pr67089-6.c
new file mode 100644
index 00000000000..9b0708b5bc4
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr67089-6.c
@@ -0,0 +1,62 @@
+/* PR target/67089 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-loop-if-convert -fdump-tree-widening_mul" } */
+
+extern void abort (void);
+
+int cnt;
+unsigned int a[16], b[16], c[16], d;
+void foo (int x);
+
+__attribute__((noinline, noclone)) void
+f0 (unsigned int x)
+{
+  for (int i = 0; i < 16; i++)
+    {
+      unsigned int r = x - a[i];
+      b[i] = r;
+      c[i] = r > x ? 7 : x;
+    }
+}
+
+#define T(n, type, op, cond) \
+__attribute__((noinline, noclone))	\
+type					\
+f##n (type x, type y)			\
+{					\
+  type r = op;				\
+  cond;					\
+  return r;				\
+}
+
+T (1, unsigned int, x - y, if (r > x) foo (0))
+T (2, unsigned long, x - y, if (r <= x) foo (0))
+T (3, unsigned short, x - y, if (x < r) foo (r))
+T (4, unsigned long long, x - y, if (x >= r) foo (0))
+T (5, unsigned int, x - y, if (d || r > x) foo (0))
+T (6, unsigned long, x - y, if (d || r <= x) foo (0))
+T (7, unsigned char, x - y, if (d || x < r) foo (0))
+T (8, unsigned long long, x - y, if (d || x >= r) foo (0))
+T (9, unsigned int, x + y, if (r >= x) foo (0))
+T (10, unsigned long, x + y, if (r < x) foo (0))
+T (11, unsigned short, x + y, if (x <= r) foo (r))
+T (12, unsigned long long, x + y, if (d || x > r) foo (0))
+T (13, unsigned int, x + y, if (d || r >= x) foo (0))
+T (14, unsigned long, x + y, if (d || r < x) foo (0))
+T (15, unsigned short, x + y, if (d || x <= r) foo (0))
+T (16, unsigned long long, x + y, if (d || x > r) foo (0))
+T (17, unsigned int, x + y, if (r >= y) foo (0))
+T (18, unsigned long, x + y, if (r < y) foo (0))
+T (19, unsigned short, x + y, if (y <= r) foo (r))
+T (20, unsigned long long, x + y, if (d || y > r) foo (0))
+T (21, unsigned int, x + y, if (d || r >= y) foo (0))
+T (22, unsigned long, x + y, if (d || r < y) foo (0))
+T (23, unsigned short, x + y, if (d || y <= r) foo (0))
+T (24, unsigned long long, x + y, if (d || y > r) foo (0))
+T (25, unsigned short, 2U - x, if (r > 2U) foo (0))
+T (26, unsigned char, 2U - x, if (r <= 2U) foo (0))
+
+/* { dg-final { scan-tree-dump-times "ADD_OVERFLOW" 16 "widening_mul" { target { { i?86-*-* x86_64-*-* } && { ! ia32 } } } } } */
+/* { dg-final { scan-tree-dump-times "SUB_OVERFLOW" 11 "widening_mul" { target { { i?86-*-* x86_64-*-* } && { ! ia32 } } } } } */
+/* { dg-final { scan-tree-dump-times "ADD_OVERFLOW" 12 "widening_mul" { target { { i?86-*-* x86_64-*-* } && ia32 } } } } */
+/* { dg-final { scan-tree-dump-times "SUB_OVERFLOW" 9 "widening_mul" { target { { i?86-*-* x86_64-*-* } && ia32 } } } } */
diff --git a/gcc/testsuite/gcc.dg/pr67089-7.c b/gcc/testsuite/gcc.dg/pr67089-7.c
new file mode 100644
index 00000000000..dc05e3b2263
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr67089-7.c
@@ -0,0 +1,62 @@
+/* PR target/67089 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-loop-if-convert -fdump-tree-widening_mul" } */
+
+extern void abort (void);
+
+int cnt, d;
+void foo (int x);
+
+#define T(n, type, op, cond) \
+__attribute__((noinline, noclone))	\
+type					\
+f##n (type x, type y)			\
+{					\
+  type r = op;				\
+  cond;					\
+  return r;				\
+}
+
+T (1, unsigned int, x - y, if (r >= x) foo (0))
+T (2, unsigned long, x - y, if (r < x) foo (0))
+T (3, unsigned short, x - y, if (x <= r) foo (r))
+T (4, unsigned long long, x - y, if (d || x > r) foo (0))
+T (5, unsigned int, x - y, if (d || r >= x) foo (0))
+T (6, unsigned long, x - y, if (d || r < x) foo (0))
+T (7, unsigned short, x - y, if (d || x <= r) foo (0))
+T (8, unsigned long long, x - y, if (d || x > r) foo (0))
+T (9, unsigned int, x - y, if (r > y) foo (0))
+T (10, unsigned long, x - y, if (r <= y) foo (0))
+T (11, unsigned short, x - y, if (y < r) foo (r))
+T (12, unsigned long long, x - y, if (y >= r) foo (0))
+T (13, unsigned int, x - y, if (r >= y) foo (0))
+T (14, unsigned long, x - y, if (r < y) foo (0))
+T (15, unsigned short, x - y, if (y <= r) foo (r))
+T (16, unsigned long long, x - y, if (d || y > r) foo (0))
+T (17, unsigned int, x - y, if (d || r > y) foo (0))
+T (18, unsigned long, x - y, if (d || r <= y) foo (0))
+T (19, unsigned char, x - y, if (d || y < r) foo (0))
+T (20, unsigned long long, x - y, if (d || y >= r) foo (0))
+T (21, unsigned int, x - y, if (d || r >= y) foo (0))
+T (22, unsigned long, x - y, if (d || r < y) foo (0))
+T (23, unsigned short, x - y, if (d || y <= r) foo (0))
+T (24, unsigned long long, x - y, if (d || y > r) foo (0))
+T (25, unsigned int, x + y, if (r > x) foo (0))
+T (26, unsigned long, x + y, if (r <= x) foo (0))
+T (27, unsigned short, x + y, if (x < r) foo (r))
+T (28, unsigned long long, x + y, if (x >= r) foo (0))
+T (29, unsigned int, x + y, if (d || r > x) foo (0))
+T (30, unsigned long, x + y, if (d || r <= x) foo (0))
+T (31, unsigned char, x + y, if (d || x < r) foo (0))
+T (32, unsigned long long, x + y, if (d || x >= r) foo (0))
+T (33, unsigned int, x + y, if (r > y) foo (0))
+T (34, unsigned long, x + y, if (r <= y) foo (0))
+T (35, unsigned short, x + y, if (y < r) foo (r))
+T (36, unsigned long long, x + y, if (y >= r) foo (0))
+T (37, unsigned int, x + y, if (d || r > y) foo (0))
+T (38, unsigned long, x + y, if (d || r <= y) foo (0))
+T (39, unsigned char, x + y, if (d || y < r) foo (0))
+T (40, unsigned long long, x + y, if (d || y >= r) foo (0))
+
+/* { dg-final { scan-tree-dump-not "ADD_OVERFLOW" "widening_mul" } } */
+/* { dg-final { scan-tree-dump-not "SUB_OVERFLOW" "widening_mul" } } */
diff --git a/gcc/tree-ssa-math-opts.c b/gcc/tree-ssa-math-opts.c
index 1e7cf7ed283..8376eab746d 100644
--- a/gcc/tree-ssa-math-opts.c
+++ b/gcc/tree-ssa-math-opts.c
@@ -3491,6 +3491,189 @@ convert_mult_to_fma (gimple *mul_stmt, tree op1, tree op2)
   return true;
 }
 
+
+/* Helper function of match_uaddsub_overflow.  Return 1
+   if USE_STMT is unsigned overflow check ovf != 0 for
+   STMT, -1 if USE_STMT is unsigned overflow check ovf == 0
+   and 0 otherwise.  */
+
+static int
+uaddsub_overflow_check_p (gimple *stmt, gimple *use_stmt)
+{
+  enum tree_code ccode = ERROR_MARK;
+  tree crhs1 = NULL_TREE, crhs2 = NULL_TREE;
+  if (gimple_code (use_stmt) == GIMPLE_COND)
+    {
+      ccode = gimple_cond_code (use_stmt);
+      crhs1 = gimple_cond_lhs (use_stmt);
+      crhs2 = gimple_cond_rhs (use_stmt);
+    }
+  else if (is_gimple_assign (use_stmt))
+    {
+      if (gimple_assign_rhs_class (use_stmt) == GIMPLE_BINARY_RHS)
+	{
+	  ccode = gimple_assign_rhs_code (use_stmt);
+	  crhs1 = gimple_assign_rhs1 (use_stmt);
+	  crhs2 = gimple_assign_rhs2 (use_stmt);
+	}
+      else if (gimple_assign_rhs_code (use_stmt) == COND_EXPR)
+	{
+	  tree cond = gimple_assign_rhs1 (use_stmt);
+	  if (COMPARISON_CLASS_P (cond))
+	    {
+	      ccode = TREE_CODE (cond);
+	      crhs1 = TREE_OPERAND (cond, 0);
+	      crhs2 = TREE_OPERAND (cond, 1);
+	    }
+	  else
+	    return 0;
+	}
+      else
+	return 0;
+    }
+  else
+    return 0;
+
+  if (TREE_CODE_CLASS (ccode) != tcc_comparison)
+    return 0;
+
+  enum tree_code code = gimple_assign_rhs_code (stmt);
+  tree lhs = gimple_assign_lhs (stmt);
+  tree rhs1 = gimple_assign_rhs1 (stmt);
+  tree rhs2 = gimple_assign_rhs2 (stmt);
+
+  switch (ccode)
+    {
+    case GT_EXPR:
+    case LE_EXPR:
+      /* r = a - b; r > a or r <= a
+	 r = a + b; a > r or a <= r or b > r or b <= r.  */
+      if ((code == MINUS_EXPR && crhs1 == lhs && crhs2 == rhs1)
+	  || (code == PLUS_EXPR && (crhs1 == rhs1 || crhs1 == rhs2)
+	      && crhs2 == lhs))
+	return ccode == GT_EXPR ? 1 : -1;
+      break;
+    case LT_EXPR:
+    case GE_EXPR:
+      /* r = a - b; a < r or a >= r
+	 r = a + b; r < a or r >= a or r < b or r >= b.  */
+      if ((code == MINUS_EXPR && crhs1 == rhs1 && crhs2 == lhs)
+	  || (code == PLUS_EXPR && crhs1 == lhs
+	      && (crhs2 == rhs1 || crhs2 == rhs2)))
+	return ccode == LT_EXPR ? 1 : -1;
+      break;
+    default:
+      break;
+    }
+  return 0;
+}
+
+/* Recognize for unsigned x
+   x = y - z;
+   if (x > y)
+   where there are other uses of x and replace it with
+   _7 = SUB_OVERFLOW (y, z);
+   x = REALPART_EXPR <_7>;
+   _8 = IMAGPART_EXPR <_7>;
+   if (_8)
+   and similarly for addition.  */
+
+static bool
+match_uaddsub_overflow (gimple_stmt_iterator *gsi, gimple *stmt,
+			enum tree_code code)
+{
+  tree lhs = gimple_assign_lhs (stmt);
+  tree type = TREE_TYPE (lhs);
+  use_operand_p use_p;
+  imm_use_iterator iter;
+  bool use_seen = false;
+  bool ovf_use_seen = false;
+  gimple *use_stmt;
+
+  gcc_checking_assert (code == PLUS_EXPR || code == MINUS_EXPR);
+  if (!INTEGRAL_TYPE_P (type)
+      || !TYPE_UNSIGNED (type)
+      || has_zero_uses (lhs)
+      || has_single_use (lhs)
+      || optab_handler (code == PLUS_EXPR ? uaddv4_optab : usubv4_optab,
+			TYPE_MODE (type)) == CODE_FOR_nothing)
+    return false;
+
+  FOR_EACH_IMM_USE_FAST (use_p, iter, lhs)
+    {
+      use_stmt = USE_STMT (use_p);
+      if (is_gimple_debug (use_stmt))
+	continue;
+
+      if (uaddsub_overflow_check_p (stmt, use_stmt))
+	ovf_use_seen = true;
+      else
+	use_seen = true;
+      if (ovf_use_seen && use_seen)
+	break;
+    }
+
+  if (!ovf_use_seen || !use_seen)
+    return false;
+
+  tree ctype = build_complex_type (type);
+  tree rhs1 = gimple_assign_rhs1 (stmt);
+  tree rhs2 = gimple_assign_rhs2 (stmt);
+  gcall *g = gimple_build_call_internal (code == PLUS_EXPR
+					 ? IFN_ADD_OVERFLOW : IFN_SUB_OVERFLOW,
+					 2, rhs1, rhs2);
+  tree ctmp = make_ssa_name (ctype);
+  gimple_call_set_lhs (g, ctmp);
+  gsi_insert_before (gsi, g, GSI_SAME_STMT);
+  gassign *g2 = gimple_build_assign (lhs, REALPART_EXPR,
+				     build1 (REALPART_EXPR, type, ctmp));
+  gsi_replace (gsi, g2, true);
+  tree ovf = make_ssa_name (type);
+  g2 = gimple_build_assign (ovf, IMAGPART_EXPR,
+			    build1 (IMAGPART_EXPR, type, ctmp));
+  gsi_insert_after (gsi, g2, GSI_NEW_STMT);
+
+  FOR_EACH_IMM_USE_STMT (use_stmt, iter, lhs)
+    {
+      if (is_gimple_debug (use_stmt))
+	continue;
+
+      int ovf_use = uaddsub_overflow_check_p (stmt, use_stmt);
+      if (ovf_use == 0)
+	continue;
+      if (gimple_code (use_stmt) == GIMPLE_COND)
+	{
+	  gcond *cond_stmt = as_a <gcond *> (use_stmt);
+	  gimple_cond_set_lhs (cond_stmt, ovf);
+	  gimple_cond_set_rhs (cond_stmt, build_int_cst (type, 0));
+	  gimple_cond_set_code (cond_stmt, ovf_use == 1 ? NE_EXPR : EQ_EXPR);
+	}
+      else
+	{
+	  gcc_checking_assert (is_gimple_assign (use_stmt));
+	  if (gimple_assign_rhs_class (use_stmt) == GIMPLE_BINARY_RHS)
+	    {
+	      gimple_assign_set_rhs1 (use_stmt, ovf);
+	      gimple_assign_set_rhs2 (use_stmt, build_int_cst (type, 0));
+	      gimple_assign_set_rhs_code (use_stmt,
+					  ovf_use == 1 ? NE_EXPR : EQ_EXPR);
+	    }
+	  else
+	    {
+	      gcc_checking_assert (gimple_assign_rhs_code (use_stmt)
+				   == COND_EXPR);
+	      tree cond = build2 (ovf_use == 1 ? NE_EXPR : EQ_EXPR,
+				  boolean_type_node, ovf,
+				  build_int_cst (type, 0));
+	      gimple_assign_set_rhs1 (use_stmt, cond);
+	    }
+	}
+      update_stmt (use_stmt);
+    }
+  return true;
+}
+
+
 /* Find integer multiplications where the operands are extended from
    smaller types, and replace the MULT_EXPR with a WIDEN_MULT_EXPR
    where appropriate.  */
@@ -3563,7 +3746,8 @@ pass_optimize_widening_mul::execute (function *fun)
 
 		case PLUS_EXPR:
 		case MINUS_EXPR:
-		  convert_plusminus_to_widen (&gsi, stmt, code);
+		  if (!convert_plusminus_to_widen (&gsi, stmt, code))
+		    match_uaddsub_overflow (&gsi, stmt, code);
 		  break;
 
 		default:;