From: Clinton Popetz <cpopetz@cygnus.com>
Date: Mon, 6 Mar 2000 21:17:44 +0000 (+0000)
Subject: sh.c: (barrier_align): Handle a delay slot that is filled with an insn from the jump...
X-Git-Tag: prereleases/libstdc++-2.92~7840
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b1b41fe4acbba6e729d035d3d561e0f82ff5f06a;p=thirdparty%2Fgcc.git

sh.c: (barrier_align): Handle a delay slot that is filled with an insn from the jump...

	* config/sh/sh.c: (barrier_align): Handle a delay slot that is
	filled with an insn from the jump target.

From-SVN: r32371
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fb42c0923ebe..3c8feb5053bc 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2000-03-06  Clinton Popetz  <cpopetz@cygnus.com>
+
+	* config/sh/sh.c: (barrier_align): Handle a delay slot that is
+	filled with an insn from the jump target.
+
 2000-03-07  Michael Hayes  <m.hayes@elec.canterbury.ac.nz>
 
 	* config/c4x/c4x-protos.h (c4x_global_name): Constify char *.
diff --git a/gcc/config/sh/sh.c b/gcc/config/sh/sh.c
index 0c3d6f159eef..28d199cebfc2 100644
--- a/gcc/config/sh/sh.c
+++ b/gcc/config/sh/sh.c
@@ -2711,7 +2711,7 @@ barrier_align (barrier_or_label)
      rtx barrier_or_label;
 {
   rtx next = next_real_insn (barrier_or_label), pat, prev;
-  int slot, credit;
+  int slot, credit, jump_to_next;
  
   if (! next)
     return 0;
@@ -2754,6 +2754,13 @@ barrier_align (barrier_or_label)
 	 an alignment, against that of fetching unneeded insn in front of the
 	 branch target when there is no alignment.  */
 
+      /* There are two delay_slot cases to consider.  One is the simple case 
+	 where the preceding branch is to the insn beyond the barrier (simple 
+	 delay slot filling), and the other is where the preceding branch has 
+	 a delay slot that is a duplicate of the insn after the barrier 
+	 (fill_eager_delay_slots) and the branch is to the insn after the insn 
+	 after the barrier.  */
+
       /* PREV is presumed to be the JUMP_INSN for the barrier under
 	 investigation.  Skip to the insn before it.  */
       prev = prev_real_insn (prev);
@@ -2762,11 +2769,21 @@ barrier_align (barrier_or_label)
 	   credit >= 0 && prev && GET_CODE (prev) == INSN;
 	   prev = prev_real_insn (prev))
 	{
+	  jump_to_next = 0;
 	  if (GET_CODE (PATTERN (prev)) == USE
 	      || GET_CODE (PATTERN (prev)) == CLOBBER)
 	    continue;
 	  if (GET_CODE (PATTERN (prev)) == SEQUENCE)
-	    prev = XVECEXP (PATTERN (prev), 0, 1);
+	    {
+	      prev = XVECEXP (PATTERN (prev), 0, 1);
+	      if (INSN_UID (prev) == INSN_UID (next)) 
+		{
+	  	  /* Delay slot was filled with insn at jump target.  */
+		  jump_to_next = 1;
+		  continue;
+  		}
+	    }
+
 	  if (slot &&
 	      get_attr_in_delay_slot (prev) == IN_DELAY_SLOT_YES)
 	    slot = 0;
@@ -2775,7 +2792,7 @@ barrier_align (barrier_or_label)
       if (prev
 	  && GET_CODE (prev) == JUMP_INSN
 	  && JUMP_LABEL (prev)
-	  && next_real_insn (JUMP_LABEL (prev)) == next_real_insn (barrier_or_label))
+	  && (jump_to_next || next_real_insn (JUMP_LABEL (prev)) == next))
 	{
 	  rtx pat = PATTERN (prev);
 	  if (GET_CODE (pat) == PARALLEL)