re PR target/69551 (Wrong code with single element vector insert)

	PR target/69551
	* config/i386/i386.c (ix86_expand_vector_set) <case V4SImode>: For
	SSE1, copy target into the temporary reg first before recursing
	on it.

	* gcc.target/i386/pr69551.c: New test.

From-SVN: r232982

gcc/ChangeLog

+2016-01-29  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/69551
+	* config/i386/i386.c (ix86_expand_vector_set) <case V4SImode>: For
+	SSE1, copy target into the temporary reg first before recursing
+	on it.
+
 2016-01-29  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* config/i386/sse.md (sse2_cvtps2pd<mask_name>): Replace vBm

gcc/config/i386/i386.c

@@ -46744,6 +46744,7 @@ ix86_expand_vector_set (bool mmx_ok, rtx target, rtx val, int elt)
 	{
 	  /* For SSE1, we have to reuse the V4SF code.  */
 	  rtx t = gen_reg_rtx (V4SFmode);
+	  emit_move_insn (t, gen_lowpart (V4SFmode, target));
 	  ix86_expand_vector_set (false, t, gen_lowpart (SFmode, val), elt);
 	  emit_move_insn (target, gen_lowpart (mode, t));
 	}

gcc/testsuite/ChangeLog

 2016-01-29  Jakub Jelinek  <jakub@redhat.com>
 
+	PR target/69551
+	* gcc.target/i386/pr69551.c: New test.
+
 	PR target/66137
 	* gcc.target/i386/pr66137.c: New test.
 

gcc/testsuite/gcc.target/i386/pr69551.c

+/* PR target/69551 */
+/* { dg-do run { target sse_runtime } } */
+/* { dg-options "-O2 -mno-sse2 -msse" } */
+
+typedef unsigned char v16qi __attribute__ ((vector_size (16)));
+typedef unsigned int v4si __attribute__ ((vector_size (16)));
+
+char __attribute__ ((noinline, noclone))
+test (v4si vec)
+{
+  vec[1] = 0x5fb856;
+  return ((v16qi) vec)[0];
+}
+
+int
+main ()
+{
+  char z = test ((v4si) { -1, -1, -1, -1 });
+
+  if (z != -1)
+    __builtin_abort ();
+  return 0;
+}