From: jsturm <jsturm@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 17 Sep 2001 23:16:28 +0000 (+0000)
Subject: 	* except.c (dw2_build_landing_pads): New local
X-Git-Tag: upstream/4.9.2~92032
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=77918ba42f29c839be0a9a261842035984d18c3b;p=platform%2Fupstream%2Flinaro-gcc.git

	* except.c (dw2_build_landing_pads): New local
	clobbers_hard_regs.  Emit an ASM_INPUT as a scheduling
	barrier after clobbers.  Fixes c++/4012.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@45667 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 1e8d4f0..6a069f1 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2001-09-17  Jeff Sturm  <jsturm@one-point.com>
+
+	* except.c (dw2_build_landing_pads): New local
+	clobbers_hard_regs.  Emit an ASM_INPUT as a scheduling
+	barrier after clobbers.  Fixes c++/4012.
+
 2001-09-17  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* gcc.c (find_file): Use ACONCAT in lieu of alloca/strcpy/strcat.
diff --git a/gcc/except.c b/gcc/except.c
index 90423a7..bc21b2c 100644
--- a/gcc/except.c
+++ b/gcc/except.c
@@ -1865,6 +1865,7 @@ dw2_build_landing_pads ()
     {
       struct eh_region *region = cfun->eh->region_array[i];
       rtx seq;
+      bool clobbers_hard_regs = false;
 
       /* Mind we don't process a region more than once.  */
       if (!region || region->region_number != i)
@@ -1901,7 +1902,19 @@ dw2_build_landing_pads ()
 	  if (r == INVALID_REGNUM)
 	    break;
 	  if (! call_used_regs[r])
-	    emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, r)));
+	    {
+	      emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (Pmode, r)));
+	      clobbers_hard_regs = true;
+	    }
+	}
+
+      if (clobbers_hard_regs)
+	{
+	  /* @@@ This is a kludge.  Not all machine descriptions define a
+	     blockage insn, but we must not allow the code we just generated
+	     to be reordered by scheduling.  So emit an ASM_INPUT to act as
+	     blockage insn. */
+	  emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
 	}
 
       emit_move_insn (cfun->eh->exc_ptr,