--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.c-torture/execute/pr84524.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,41 @@
+/* PR target/84524 */
+
+__attribute__((noipa)) void
+foo (unsigned short *x)
+{
+  unsigned short i, v;
+  unsigned char j;
+  for (i = 0; i < 256; i++)
+    {
+      v = i << 8;
+      for (j = 0; j < 8; j++)
+	if (v & 0x8000)
+	  v = (v << 1) ^ 0x1021;
+	else
+	  v = v << 1;
+      x[i] = v;
+    }
+}
+
+int
+main ()
+{
+  unsigned short a[256];
+
+  foo (a);
+  for (int i = 0; i < 256; i++)
+    {
+      unsigned short v = i << 8;
+      for (int j = 0; j < 8; j++)
+	{
+	  asm volatile ("" : "+r" (v));
+	  if (v & 0x8000)
+	    v = (v << 1) ^ 0x1021;
+	  else
+	    v = v << 1;
+	}
+      if (a[i] != v)
+	__builtin_abort ();
+    }
+  return 0;
+}