From: Richard Kenner <kenner@gcc.gnu.org>
Date: Tue, 11 Jan 1994 00:31:01 +0000 (-0500)
Subject: (simplify_relational_operation): Don't do anything with CC0 in
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=28bad1cbc3d2c0d2b942296e4f32ff32bc6701b5;p=gcc.git

(simplify_relational_operation): Don't do anything with CC0 in
addition to MODE_CC values.

From-SVN: r6376
---

diff --git a/gcc/cse.c b/gcc/cse.c
index 2d4883301b2..dd2cb28e5e7 100644
--- a/gcc/cse.c
+++ b/gcc/cse.c
@@ -4296,9 +4296,13 @@ simplify_relational_operation (code, mode, op0, op1)
   if (GET_CODE (op0) == COMPARE && op1 == const0_rtx)
     op1 = XEXP (op0, 1), op0 = XEXP (op0, 0);
 
-  /* What to do with MODE_CC isn't clear yet.
-     Let's make sure nothing erroneous is done.  */
-  if (GET_MODE_CLASS (GET_MODE (op0)) == MODE_CC)
+  /* We can't simplify MODE_CC values since we don't know what the
+     actual comparison is.  */
+  if (GET_MODE_CLASS (GET_MODE (op0)) == MODE_CC
+#ifdef HAVE_cc0
+      || op0 == cc0_rtx
+#endif
+      )
     return 0;
 
   /* For integer comparisons of A and B maybe we can simplify A - B and can