backport: re PR middle-end/71626 (ICE at -O1 and above on x86_64-linux-gnu (in output_constant_pool_2, at varasm.c:3837))

Backported from mainline
	2016-06-28  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/71626
	* config/i386/i386.c (ix86_expand_vector_move): For SUBREG of
	a constant, force its SUBREG_REG into memory or register instead
	of whole op1.

	* gcc.c-torture/execute/pr71626-1.c: New test.
	* gcc.c-torture/execute/pr71626-2.c: New test.

From-SVN: r238101

gcc/ChangeLog

@@ -1,6 +1,13 @@
 2016-07-07  Jakub Jelinek  <jakub@redhat.com>
 
 	Backported from mainline
+	2016-06-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/71626
+	* config/i386/i386.c (ix86_expand_vector_move): For SUBREG of
+	a constant, force its SUBREG_REG into memory or register instead
+	of whole op1.
+
 	2016-06-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/71588

gcc/config/i386/i386.c

@@ -17599,12 +17599,29 @@ ix86_expand_vector_move (machine_mode mode, rtx operands[])
      of the register, once we have that information we may be able
      to handle some of them more efficiently.  */
   if (can_create_pseudo_p ()
-      && register_operand (op0, mode)
       && (CONSTANT_P (op1)
 	  || (GET_CODE (op1) == SUBREG
 	      && CONSTANT_P (SUBREG_REG (op1))))
-      && !standard_sse_constant_p (op1))
+      && ((register_operand (op0, mode)
-    op1 = validize_mem (force_const_mem (mode, op1));
+	   && !standard_sse_constant_p (op1))
+	  /* ix86_expand_vector_move_misalign() does not like constants.  */
+	  || (SSE_REG_MODE_P (mode)
+	      && MEM_P (op0)
+	      && MEM_ALIGN (op0) < align)))
+    {
+      if (SUBREG_P (op1))
+	{
+	  machine_mode imode = GET_MODE (SUBREG_REG (op1));
+	  rtx r = force_const_mem (imode, SUBREG_REG (op1));
+	  if (r)
+	    r = validize_mem (r);
+	  else
+	    r = force_reg (imode, SUBREG_REG (op1));
+	  op1 = simplify_gen_subreg (mode, r, imode, SUBREG_BYTE (op1));
+	}
+      else
+	op1 = validize_mem (force_const_mem (mode, op1));
+    }
 
   /* We need to check memory alignment for SSE mode since attribute
      can make operands unaligned.  */
@@ -17615,13 +17632,8 @@ ix86_expand_vector_move (machine_mode mode, rtx operands[])
     {
       rtx tmp[2];
 
-      /* ix86_expand_vector_move_misalign() does not like constants ... */
+      /* ix86_expand_vector_move_misalign() does not like both
-      if (CONSTANT_P (op1)
+	 arguments in memory.  */
-	  || (GET_CODE (op1) == SUBREG
-	      && CONSTANT_P (SUBREG_REG (op1))))
-	op1 = validize_mem (force_const_mem (mode, op1));
-
-      /* ... nor both arguments in memory.  */
       if (!register_operand (op0, mode)
 	  && !register_operand (op1, mode))
 	op1 = force_reg (mode, op1);

gcc/testsuite/ChangeLog

@@ -1,6 +1,12 @@
 2016-07-07  Jakub Jelinek  <jakub@redhat.com>
 
 	Backported from mainline
+	2016-06-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/71626
+	* gcc.c-torture/execute/pr71626-1.c: New test.
+	* gcc.c-torture/execute/pr71626-2.c: New test.
+
 	2016-06-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/71588

gcc/testsuite/gcc.c-torture/execute/pr71626-1.c

@@ -0,0 +1,19 @@
+/* PR middle-end/71626 */
+
+typedef __INTPTR_TYPE__ V __attribute__((__vector_size__(sizeof (__INTPTR_TYPE__))));
+
+__attribute__((noinline, noclone)) V
+foo ()
+{
+  V v = { (__INTPTR_TYPE__) foo };
+  return v;
+}
+
+int
+main ()
+{
+  V v = foo ();
+  if (v[0] != (__INTPTR_TYPE__) foo)
+    __builtin_abort ();
+  return 0;
+}

gcc/testsuite/gcc.c-torture/execute/pr71626-2.c

@@ -0,0 +1,4 @@
+/* PR middle-end/71626 */
+/* { dg-additional-options "-fpic" { target fpic } } */
+
+#include "pr71626-1.c"