From: Richard Kenner <kenner@gcc.gnu.org>
Date: Sun, 18 May 1997 12:39:57 +0000 (-0400)
Subject: (maybe_eliminate_biv_1): In (set (cc0) <biv>) case, swap compare
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2ae3dcac7b4c2901bda0ff9b4fc6768309c35f42;p=gcc.git

(maybe_eliminate_biv_1): In (set (cc0) <biv>) case, swap compare
operands when mult_val < 0 in one additional place.

From-SVN: r14087
---

diff --git a/gcc/loop.c b/gcc/loop.c
index 64c1245977a..1c2cbc24161 100644
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -6343,9 +6343,10 @@ maybe_eliminate_biv_1 (x, insn, bl, eliminate_p, where)
 		emit_insn_before (gen_move_insn (tem, copy_rtx (v->add_val)),
 				  where);
 
-		if (validate_change (insn, &SET_SRC (PATTERN (insn)),
-				     gen_rtx (COMPARE, VOIDmode,
-					      v->new_reg, tem), 0))
+		/* Substitute the new register for its invariant value in
+		   the compare expression. */
+		XEXP (new, (INTVAL (v->mult_val) < 0) ? 0 : 1) = tem;
+		if (validate_change (insn, &SET_SRC (PATTERN (insn)), new, 0))
 		  return 1;
 	      }
 	}