From patchwork Mon Oct 22 03:47:38 2012
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Subject: [lra] patch to fix a gfortran test failure
Date: Sun, 21 Oct 2012 17:47:38 -0000
From: Vladimir Makarov <vmakarov@redhat.com>
X-Patchwork-Id: 193073
Message-Id: <5084C1DA.9080001@redhat.com>
To: GCC Patches <gcc-patches@gcc.gnu.org>

The following patch fixes a gfortran test failure.  LRA tried to put 
a split code after sibling call.  Sibling calls mean no return.

   Committed as rev. 192657.

2012-10-21  Vladimir Makarov <vmakarov@redhat.com>

         * lra-constraints.c (inherit_in_ebb): Check sibling call.


Index: lra-constraints.c
===================================================================
--- lra-constraints.c	(revision 192656)
+++ lra-constraints.c	(working copy)
@@ -4491,8 +4491,9 @@ inherit_in_ebb (rtx head, rtx tail)
 	  last_insn = get_last_insertion_point (curr_bb);
 	  after_p = (! JUMP_P (last_insn)
 		     && (! CALL_P (last_insn)
-			 || find_reg_note (last_insn,
-					   REG_NORETURN, NULL) == NULL_RTX));
+			 || (find_reg_note (last_insn,
+					   REG_NORETURN, NULL) == NULL_RTX
+			     && ! SIBLING_CALL_P (last_insn))));
 	  REG_SET_TO_HARD_REG_SET (live_hard_regs, df_get_live_out (curr_bb));
 	  IOR_HARD_REG_SET (live_hard_regs, eliminable_regset);
 	  IOR_HARD_REG_SET (live_hard_regs, lra_no_alloc_regs);