* flow.c (verify_local_live_at_start): Allow hard regs to die.

From-SVN: r37220

1 files changed, 17 insertions, 4 deletions

diff --git a/gcc/flow.c b/gcc/flow.c
index d286f91..a48accf 100644
--- a/gcc/flow.c
+++ b/gcc/flow.c
@@ -2888,11 +2888,24 @@ verify_local_live_at_start (new_live_at_start, bb)
 
       EXECUTE_IF_SET_IN_REG_SET (new_live_at_start, 0, i,
 	{
-          /* No registers should die.  */
+          /* No pseudo registers should die.  */
 	  if (REGNO_REG_SET_P (bb->global_live_at_start, i))
-	    abort ();
-          /* Verify that the now-live register is wider than word_mode.  */
-	  verify_wide_reg (i, bb->head, bb->end);
+	    {
+	      /* But hard regs can reasonably die, e.g. when we combine
+		 (insn 6 30 7 (set (reg/v:DI 83)
+				   (reg:DI 5 r5)) (nil)
+		     (expr_list:REG_DEAD (reg:DI 5 r5) (nil)))
+		 ... and ...
+		 (insn 17 15 18 (set (reg:SI 5 r5)
+				(subreg:SI (reg/v:DI 83) 1)) (insn_list 6 (nil))
+		     (expr_list:REG_DEAD (reg/v:DI 83) (nil))) .  */
+
+	      if (i >= FIRST_PSEUDO_REGISTER)
+		abort ();
+	    }
+	  else
+	    /* Verify that the now-live register is wider than word_mode.  */
+	    verify_wide_reg (i, bb->head, bb->end);
 	});
     }
 }