patch to fix PR77856

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 243034)
+++ ChangeLog	(working copy)
@@ -1,3 +1,10 @@ 
+2016-11-30  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR tree-optimization/77856
+	* lra-constraints.c (inherit_in_ebb): Check original regno for
+	invalid invariant regs too.  Set only clobbered hard regs for the
+	invalid invariant regs.
+
 2016-11-30  Pitchumani Sivanupandi  <pitchumani.sivanupandi@microchip.com>
 
 	Commit files forgotten in r242966.
Index: lra-constraints.c
===================================================================
--- lra-constraints.c	(revision 242848)
+++ lra-constraints.c	(working copy)
@@ -5886,7 +5886,9 @@  inherit_in_ebb (rtx_insn *head, rtx_insn
 	       && dst_regno >= lra_constraint_new_regno_start
 	       && invariant_p (SET_SRC (curr_set))
 	       && (cl = lra_get_allocno_class (dst_regno)) != NO_REGS
-	       && ! bitmap_bit_p (&invalid_invariant_regs, dst_regno))
+	       && ! bitmap_bit_p (&invalid_invariant_regs, dst_regno)
+	       && ! bitmap_bit_p (&invalid_invariant_regs,
+				  ORIGINAL_REGNO(regno_reg_rtx[dst_regno])))
 	{
 	  /* 'reload_pseudo <- invariant'.  */
 	  if (ira_class_hard_regs_num[cl] <= max_small_class_regs_num)
@@ -6157,16 +6159,20 @@  inherit_in_ebb (rtx_insn *head, rtx_insn
 	  curr_id = lra_get_insn_recog_data (curr_insn);
 	  for (reg = curr_id->regs; reg != NULL; reg = reg->next)
 	    if (reg->type != OP_IN)
-	      bitmap_set_bit (&invalid_invariant_regs, reg->regno);
+	      {
+		bitmap_set_bit (&invalid_invariant_regs, reg->regno);
+		bitmap_set_bit (&invalid_invariant_regs,
+				ORIGINAL_REGNO (regno_reg_rtx[reg->regno]));
+	      }
 	  curr_static_id = curr_id->insn_static_data;
 	  for (reg = curr_static_id->hard_regs; reg != NULL; reg = reg->next)
 	    if (reg->type != OP_IN)
 	      bitmap_set_bit (&invalid_invariant_regs, reg->regno);
 	  if (curr_id->arg_hard_regs != NULL)
 	    for (i = 0; (regno = curr_id->arg_hard_regs[i]) >= 0; i++)
+	      if (regno >= FIRST_PSEUDO_REGISTER)
 		bitmap_set_bit (&invalid_invariant_regs,
-				regno >= FIRST_PSEUDO_REGISTER
-				? regno : regno - FIRST_PSEUDO_REGISTER);
+				regno - FIRST_PSEUDO_REGISTER);
 	}
       /* We reached the start of the current basic block.  */
       if (prev_insn == NULL_RTX || prev_insn == PREV_INSN (head)
Index: testsuite/ChangeLog
===================================================================
--- testsuite/ChangeLog	(revision 243034)
+++ testsuite/ChangeLog	(working copy)
@@ -1,3 +1,8 @@ 
+2016-11-30  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR tree-optimization/77856
+	* gcc.target/i386.c (pr77856.c): New.
+
 2016-11-30  Andre Vehreschild  <vehre@gcc.gnu.org>
 
 	Now really add the file.
Index: testsuite/gcc.target/i386/pr77856.c
===================================================================
--- testsuite/gcc.target/i386/pr77856.c	(revision 0)
+++ testsuite/gcc.target/i386/pr77856.c	(working copy)
@@ -0,0 +1,83 @@ 
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+extern void abort (void);
+
+unsigned a, e;
+
+struct S0
+{
+  int f1;
+  int f8;
+} c = {4, 6};
+
+int b, f, g, h, i, j, l, p;
+short d, o = -7;
+char k, n = 5;
+
+unsigned fn1 (int p1, int p2)
+{
+  return p2 >= 2 || p1 >> p2 ? p1 : p1 << p2;
+}
+
+static short fn2 (struct S0 p1)
+{
+  int *q = 0;
+  int r = 7;
+  if (!a)
+    {
+      c.f1 = 1;
+      for (; c.f1; c.f1--)
+	if (fn1 (10 != 0, p1.f8))
+	  {
+	    short s = 9 << ~o % (d ^ n);
+	    int t = s >> h % ~d;
+	    p = r;
+	    r = s | p * (d && 9) | t;
+	    int u = i & c.f1;
+	    unsigned v = ~(~(u & h) | (~(8 >> c.f1) & i));
+	    int w = v;
+	    if (u < 9)
+	      w = c.f1;
+	    if (i > h && u)
+	      {
+		__builtin_printf ("%d\n", c.f1);
+		continue;
+	      }
+	    c.f1 = w;
+	    if (!p)
+	      continue;
+	    return 0;
+	  }
+      for (;;)
+	*q = 0;
+    }
+  return 0;
+}
+
+static void fn3 ()
+{
+  fn2 (c);
+  l = c.f1 < b;
+  if (l)
+    {
+    L1:
+      e = l | j / e % ~f;
+      j = f - 4 % k < c.f1 / e / b - j - 1;
+      if (l)
+	{
+	  __builtin_printf ("%d\n", b);
+	  goto L1;
+	}
+      int m[245];
+      g = m[2];
+    }
+}
+
+int main ()
+{
+  fn3 ();
+  if (c.f1 != 1)
+    abort ();
+  return 0;
+}