From: Roger Sayle <roger@eyesopen.com>
Date: Sat, 25 May 2002 16:09:20 +0000 (+0000)
Subject: simplify-rtx.c (simplify_gen_relational): Simplify the RTX (cond (compare x y) 0... 
X-Git-Tag: releases/gcc-3.3.0~4815
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=fb2c68414e698e8901a522fbc007e3cd0a201a22;p=thirdparty%2Fgcc.git

simplify-rtx.c (simplify_gen_relational): Simplify the RTX (cond (compare x y) 0) into the equivalent (cond x y).


	* simplify-rtx.c (simplify_gen_relational): Simplify the RTX
	(cond (compare x y) 0) into the equivalent (cond x y).

From-SVN: r53870
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 86d94094bcd5..8c83eb61cc25 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2002-05-25  Roger Sayle  <roger@eyesopen.com>
+
+	* simplify-rtx.c (simplify_gen_relational): Simplify the RTX
+	(cond (compare x y) 0) into the equivalent (cond x y).
+
 2002-05-25  Gabriel Dos Reis  <gdr@codesourcery.com>
 
 	* toplev.c (output_clean_symbol_name): Use xstrdup.  Fix thinko.
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c
index 36bcc1a22dc1..6ec33a3935be 100644
--- a/gcc/simplify-rtx.c
+++ b/gcc/simplify-rtx.c
@@ -232,6 +232,10 @@ simplify_gen_relational (code, mode, cmp_mode, op0, op1)
   if ((tem = simplify_relational_operation (code, cmp_mode, op0, op1)) != 0)
     return tem;
 
+  /* If op0 is a compare, extract the comparison arguments from it.  */
+  if (GET_CODE (op0) == COMPARE && op1 == const0_rtx)
+    op1 = XEXP (op0, 1), op0 = XEXP (op0, 0);
+
   /* Put complex operands first and constants second.  */
   if (swap_commutative_operands_p (op0, op1))
     tem = op0, op0 = op1, op1 = tem, code = swap_condition (code);