re PR rtl-optimization/58759 (wrong code (segfaults) at -O2 on x86_64-linux-gnu in 32-bit mode)

2013-10-25  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/58759
	* lra-constraints.c (lra_constraints): Remove wrong condition to
	remove insn setting up an equivalent pseudo.

2013-10-25  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/58759
	* gcc.target/i386/pr58759.c: New.

From-SVN: r204080

gcc/ChangeLog

 2013-10-25  Vladimir Makarov  <vmakarov@redhat.com>
 
+	PR rtl-optimization/58759
+	* lra-constraints.c (lra_constraints): Remove wrong condition to
+	remove insn setting up an equivalent pseudo.
+
+2013-10-25  Vladimir Makarov  <vmakarov@redhat.com>
+
 	* config/rs6000/rs6000-protos.h
 	(rs6000_secondary_memory_needed_mode): New prototype.
 	* config/rs6000/rs6000.c: Include ira.h.

gcc/lra-constraints.c

@@ -3975,18 +3975,6 @@ lra_constraints (bool first_p)
 		dest_reg = SUBREG_REG (dest_reg);
 	      if ((REG_P (dest_reg)
 		   && (x = get_equiv_substitution (dest_reg)) != dest_reg
-		   /* Check that this is actually an insn setting up
-		      the equivalence.  */
-		   && (in_list_p (curr_insn,
-				  ira_reg_equiv
-				  [REGNO (dest_reg)].init_insns)
-		       /* Init insns may contain not all insns setting
-			  up equivalence as we have live range
-			  splitting.  So here we use another condition
-			  to check insn setting up the equivalence
-			  which should be removed, e.g. in case when
-			  the equivalence is a constant.  */
-		       || ! MEM_P (x))
 		   /* Remove insns which set up a pseudo whose value
 		      can not be changed.  Such insns might be not in
 		      init_insns because we don't update equiv data
@@ -4001,6 +3989,8 @@ lra_constraints (bool first_p)
 		      case we should remove the additional insn and
 		      this insn is not init_insns list.  */
 		   && (! MEM_P (x) || MEM_READONLY_P (x)
+		       /* Check that this is actually an insn setting
+			  up the equivalence.  */
 		       || in_list_p (curr_insn,
 				     ira_reg_equiv
 				     [REGNO (dest_reg)].init_insns)))

gcc/testsuite/ChangeLog

+2013-10-25  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR rtl-optimization/58759
+	* gcc.target/i386/pr58759.c: New.
+
 2013-10-25  Tobias Burnus  <burnus@net-b.de>
 
 	* g++.dg/vect/pr33426-ivdep.cc: Use dg-options.

gcc/testsuite/gcc.target/i386/pr58759.c

+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+
+int a, b, c, d, e, f, h, l, m, n, k, o;
+long long g;
+
+struct S
+{
+  int f1;
+  int f2;
+  int f3;
+  int f4;
+};
+
+static struct S i = {0,0,0,0}, j;
+
+void
+foo ()
+{
+  m = 1 & d;
+  n = b + c;
+  o = k >> 1;
+  f = 0 == e;
+}
+
+int
+main ()
+{
+  for (; h < 1; h++)
+    {
+      g = 1 | (0 > 1 - a ? 0 : a);
+      foo ();
+      for (l = 0; l < 3; l++)
+      j = i;
+    }
+  return 0;
+}