sh.c (barrier_align): Check that an operand really is an insn before extracting its INSN_CODE.

2001-07-18  Andrew Haley  <aph@cambridge.redhat.com>

        * config/sh/sh.c (barrier_align): Check that an operand really is
        an insn before extracting its INSN_CODE.

From-SVN: r44303

gcc/ChangeLog

+2001-07-18  Andrew Haley  <aph@cambridge.redhat.com>
+
+        * config/sh/sh.c (barrier_align): Check that an operand really is
+        an insn before extracting its INSN_CODE.
+
 2001-07-24  Andrew Haley  <aph@cambridge.redhat.com>
 
 	* config/sh/sh.h (OVERRIDE_OPTIONS): Add braces to get rid of

gcc/config/sh/sh.c

@@ -2956,28 +2956,32 @@ barrier_align (barrier_or_label)
 	}
       if (prev
 	  && GET_CODE (prev) == JUMP_INSN
-	  && JUMP_LABEL (prev)
-	  && (jump_to_next || next_real_insn (JUMP_LABEL (prev)) == next
+	  && JUMP_LABEL (prev))
+	{
+	  rtx x;
+	  if (jump_to_next 
+	      || next_real_insn (JUMP_LABEL (prev)) == next
 	      /* If relax_delay_slots() decides NEXT was redundant
 		 with some previous instruction, it will have
 		 redirected PREV's jump to the following insn.  */
 	      || JUMP_LABEL (prev) == next_nonnote_insn (next)
 	      /* There is no upper bound on redundant instructions that
-		 might have been skipped, but we must not put an alignment
-		 where none had been before.  */
-	      || (INSN_CODE (NEXT_INSN (NEXT_INSN (PREV_INSN (prev))))
-		  == CODE_FOR_block_branch_redirect)
-	      || (INSN_CODE (NEXT_INSN (NEXT_INSN (PREV_INSN (prev))))
-		  == CODE_FOR_indirect_jump_scratch)))
-	{
-	  rtx pat = PATTERN (prev);
-	  if (GET_CODE (pat) == PARALLEL)
-	    pat = XVECEXP (pat, 0, 0);
-	  if (credit - slot >= (GET_CODE (SET_SRC (pat)) == PC ? 2 : 0))
-	    return 0;
-	}
+		 might have been skipped, but we must not put an
+		 alignment where none had been before.  */
+	      || (x = (NEXT_INSN (NEXT_INSN (PREV_INSN (prev)))),	    
+		  (INSN_P (x) 
+		   && (INSN_CODE (x) == CODE_FOR_block_branch_redirect
+		       || INSN_CODE (x) == CODE_FOR_indirect_jump_scratch))))
+	    {
+	      rtx pat = PATTERN (prev);
+	      if (GET_CODE (pat) == PARALLEL)
+	      pat = XVECEXP (pat, 0, 0);
+	      if (credit - slot >= (GET_CODE (SET_SRC (pat)) == PC ? 2 : 0))
+		return 0;
+	    }
+	}     
     }
-
+  
   return CACHE_LOG;
 }