--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr46212.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,24 @@
+/* PR rtl-optimization/46212 */
+/* { dg-do compile } */
+/* { dg-options "-O3 -funroll-loops" } */
+/* { dg-options "-O3 -funroll-loops -march=i386" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
+/* { dg-require-effective-target int32plus } */
+
+static inline unsigned
+foo (void *x)
+{
+  unsigned y = *(volatile unsigned *) (x);
+  return (y >> 24) | ((y >> 8) & 0xff00) | ((y & 0xff00) << 8) | (y << 24);
+}
+
+void
+bar (void *x, void *y, int z)
+{
+  unsigned c;
+  while (z--)
+    {
+      c = foo (y);
+      *(unsigned *) x = (c & 0xf80000) >> 9 | (c & 0xf800) >> 6
+			| (c & 0xf8) >> 3 | (c & 0x80000000) >> 16;
+    }
+}