diff --git a/gcc/combine.c b/gcc/combine.c
index 64d334e0b2a6d731310e67779ad3fd74c326a186..dc0d4bd52c717b88608d21dbaffe444eeb68bb2d 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -5897,6 +5897,13 @@ combine_simplify_rtx (rtx x, machine_mode op0_mode, int in_dest,
 			  || XEXP (temp, 1) != XEXP (x, 0)))))
 	    return temp;
 	}
+
+      /* Canonicalize x + x into x << 1.  */
+      if (GET_MODE_CLASS (mode) == MODE_INT
+	  && rtx_equal_p (XEXP (x, 0), XEXP (x, 1))
+	  && !side_effects_p (XEXP (x, 0)))
+	return simplify_gen_binary (ASHIFT, mode, XEXP (x, 0), const1_rtx);
+
       break;
 
     case MINUS:
diff --git a/gcc/testsuite/gcc.target/aarch64/pr68651_1.c b/gcc/testsuite/gcc.target/aarch64/pr68651_1.c
new file mode 100644
index 0000000000000000000000000000000000000000..ef9456f538776e7db01ecf5473425aed9efd9de2
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/pr68651_1.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mcpu=cortex-a53" } */
+
+int
+foo (int x)
+{
+  return (x * 2) & 65535;
+}
+/* { dg-final { scan-assembler "ubfiz\tw\[0-9\]*, w\[0-9\]*.*\n" } } */
+
+int
+bar (int x, int y)
+{
+  return (x * 2) | y;
+}
+/* { dg-final { scan-assembler "orr\tw\[0-9\]*, w\[0-9\]*, w\[0-9\]*, lsl 1.*\n" } } */