re PR rtl-optimization/70542 (Wrong code with -O3 -mavx2.)

	PR rtl-optimization/70542
	* ree.c (add_removable_extension): For VECTOR_MODE_P punt
	if there are any uses other than insn or debug insns.

	* gcc.dg/torture/pr70542.c: New test.
	* gcc.target/i386/avx2-pr70542.c: New test.

From-SVN: r234756

gcc/ChangeLog

+2016-04-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/70542
+	* ree.c (add_removable_extension): For VECTOR_MODE_P punt
+	if there are any uses other than insn or debug insns.
+
 2016-04-05  Marc Glisse  <marc.glisse@inria.fr>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/ree.c

@@ -1025,11 +1025,11 @@ add_removable_extension (const_rtx expr, rtx_insn *insn,
 	    return;
 	  }
 	/* For vector mode extensions, ensure that all uses of the
-	   XEXP (src, 0) register are the same extension (both code
-	   and to which mode), as unlike integral extensions lowpart
-	   subreg of the sign/zero extended register are not equal
-	   to the original register, so we have to change all uses or
-	   none.  */
+	   XEXP (src, 0) register are in insn or debug insns, as unlike
+	   integral extensions lowpart subreg of the sign/zero extended
+	   register are not equal to the original register, so we have
+	   to change all uses or none and the current code isn't able
+	   to change them all at once in one transaction.  */
 	else if (VECTOR_MODE_P (GET_MODE (XEXP (src, 0))))
 	  {
 	    if (idx == 0)
@@ -1046,15 +1046,7 @@ add_removable_extension (const_rtx expr, rtx_insn *insn,
 			break;
 		      }
 		    rtx_insn *use_insn = DF_REF_INSN (ref_link->ref);
-		    const_rtx use_set;
-		    if (use_insn == insn || DEBUG_INSN_P (use_insn))
-		      continue;
-		    if (!(use_set = single_set (use_insn))
-			|| !REG_P (SET_DEST (use_set))
-			|| GET_MODE (SET_DEST (use_set)) != GET_MODE (dest)
-			|| GET_CODE (SET_SRC (use_set)) != code
-			|| !rtx_equal_p (XEXP (SET_SRC (use_set), 0),
-					 XEXP (src, 0)))
+		    if (use_insn != insn && !DEBUG_INSN_P (use_insn))
 		      {
 			idx = -1U;
 			break;

gcc/testsuite/ChangeLog

+2016-04-05  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/70542
+	* gcc.dg/torture/pr70542.c: New test.
+	* gcc.target/i386/avx2-pr70542.c: New test.
+
 2016-04-05  Zdenek Sojka  <zsojka@seznam.cz>
 
 	PR tree-optimization/70509

gcc/testsuite/gcc.dg/torture/pr70542.c

+/* PR rtl-optimization/70542 */
+/* { dg-do run } */
+
+int a[113], d[113];
+short b[113], c[113], e[113];
+
+int
+main ()
+{
+  int i;
+  long j;
+  for (i = 0; i < 113; ++i)
+    {
+      a[i] = -636544305;
+      b[i] = -31804;
+    }
+  for (j = 1; j <= 112; ++j)
+    {
+      c[j] = b[j] >> ((a[j] & 1587842570) - 1510214139);
+      if (a[j])
+	d[j] = j;
+      e[j] = 7 << ((2312631697 - b[j]) - 2312663500);
+    }
+  asm volatile ("" : : : "memory");
+  if (c[0] || d[0] || e[0])
+    __builtin_abort ();
+  for (i = 1; i <= 112; ++i)
+    if (c[i] != -1 || d[i] != i || e[i] != 14)
+      __builtin_abort ();
+  return 0;
+}

gcc/testsuite/gcc.target/i386/avx2-pr70542.c

+/* PR tree-optimization/70542 */
+/* { dg-do run } */
+/* { dg-options "-O3 -mavx2" } */
+/* { dg-require-effective-target avx2 } */
+
+#include "avx2-check.h"
+
+#define main() do_main ()
+
+#include "../../gcc.dg/torture/pr70542.c"
+
+static void
+avx2_test (void)
+{
+  do_main ();
+}