3 files changed, 41 insertions, 2 deletions
diff --git a/gcc/combine.c b/gcc/combine.c
index c88382e..4782e1d 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -11003,8 +11003,11 @@ simplify_shift_const_1 (enum rtx_code code, machine_mode result_mode,
 		break;
 	      /* For ((int) (cstLL >> count)) >> cst2 just give up.  Queuing
 		 up outer sign extension (often left and right shift) is
-		 hardly more efficient than the original.  See PR70429.  */
-	      if (code == ASHIFTRT && int_mode != int_result_mode)
+		 hardly more efficient than the original.  See PR70429.
+		 Similarly punt for rotates with different modes.
+		 See PR97386.  */
+	      if ((code == ASHIFTRT || code == ROTATE)
+		  && int_mode != int_result_mode)
 		break;
 
 	      rtx count_rtx = gen_int_shift_amount (int_result_mode, count);
diff --git a/gcc/testsuite/gcc.c-torture/execute/pr97386-1.c b/gcc/testsuite/gcc.c-torture/execute/pr97386-1.c
new file mode 100644
index 0000000..c50e0380
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/pr97386-1.c
@@ -0,0 +1,16 @@
+/* PR rtl-optimization/97386 */
+
+__attribute__((noipa)) unsigned char
+foo (unsigned int c)
+{
+  return __builtin_bswap16 ((unsigned long long) (0xccccLLU << c | 0xccccLLU >> ((-c) & 63)));
+}
+
+int
+main ()
+{
+  unsigned char x = foo (0);
+  if (__CHAR_BIT__ == 8 && __SIZEOF_SHORT__ == 2 && x != 0xcc)
+    __builtin_abort ();
+  return 0;
+}
diff --git a/gcc/testsuite/gcc.c-torture/execute/pr97386-2.c b/gcc/testsuite/gcc.c-torture/execute/pr97386-2.c
new file mode 100644
index 0000000..e61829d
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/pr97386-2.c
@@ -0,0 +1,20 @@
+/* PR rtl-optimization/97386 */
+
+__attribute__((noipa)) unsigned
+foo (int x)
+{
+  unsigned long long a = (0x800000000000ccccULL << x) | (0x800000000000ccccULL >> (64 - x));
+  unsigned int b = a;
+  return (b << 24) | (b >> 8);
+}
+
+int
+main ()
+{
+  if (__CHAR_BIT__ == 8
+      && __SIZEOF_INT__ == 4
+      &&  __SIZEOF_LONG_LONG__ == 8
+      && foo (1) != 0x99000199U)
+    __builtin_abort ();
+  return 0;
+}