From: Richard Stallman <rms@gnu.org>
Date: Mon, 31 May 1993 06:08:41 +0000 (+0000)
Subject: (output_cbranch): In forward/long branch case...
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8d6f415e90f94dd0360c6f140744d92af3d3575f;p=gcc.git

(output_cbranch): In forward/long branch case...

(output_cbranch): In forward/long branch case, only
nullify if the delay slot was empty or if the delay slot
was explicitly nullified.

(output_bb): Likewise.

From-SVN: r4608
---

diff --git a/gcc/config/pa/pa.c b/gcc/config/pa/pa.c
index 6ab86b7246d..ff04b056f72 100644
--- a/gcc/config/pa/pa.c
+++ b/gcc/config/pa/pa.c
@@ -3225,10 +3225,13 @@ output_cbranch (operands, nullify, length, negated, insn)
 	  strcat (buf, "%S3");
 	else
 	  strcat (buf, "%B3");
-	/* Regardless of whether or not this branch got its slot
-	   filled we can nullify the following instruction and 
-	   avoid emitting a nop.  */
-	strcat (buf, " %2,%1,0\n\tbl%* %0,0");
+	/* Nullify the delay slot if the delay slot was explicitly
+	   nullified by the delay branch scheduler or if no insn
+	   could be placed in the delay slot.  */
+	if (nullify)
+	  strcat (buf, " %2,%1,0\n\tbl,n %0,0");
+	else
+	  strcat (buf, " %2,%1,0\n\tbl%* %0,0");
 	break;
 
       /* Long backward conditional branch with nullification.  */
@@ -3308,10 +3311,14 @@ output_bb (operands, nullify, length, negated, insn, which)
 	  strcat (buf, "<");
 	else
 	  strcat (buf, ">=");
-	/* Regardless of whether or not this branch got its slot
-	   filled we can nullify the following instruction and 
-	   avoid emitting a nop.  */
-	if (negated)
+	/* Nullify the delay slot if the delay slot was explicitly
+	   nullified by the delay branch scheduler or if no insn
+	   could be placed in the delay slot.  */
+	if (nullify && negated)
+	  strcat (buf, " %0,%1,1,0\n\tbl,n %3,0");
+	else if (nullify && ! negated)
+	  strcat (buf, " %0,%1,1,0\n\tbl,n %2,0");
+	else if (negated)
 	  strcat (buf, " %0,%1,1,0\n\tbl%* %3,0");
 	else 
 	  strcat (buf, " %0,%1,1,0\n\tbl%* %2,0");