From 139c978a44cbf1a53186af94715de74b83c542dc Mon Sep 17 00:00:00 2001
From: Jeff Law <law@redhat.com>
Date: Fri, 28 Jan 2005 09:35:46 -0700
Subject: fold-const.c (fold, [...]): Optimize 0 % X.

        * fold-const.c (fold, case CEIL_MOD_EXPR): Optimize 0 % X.
        (case FLOOR_MOD_EXPR, ROUND_MOD_EXPR, TRUNC_MOD_EXPR): Similarly.

From-SVN: r94376
---
 gcc/fold-const.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'gcc/fold-const.c')

diff --git a/gcc/fold-const.c b/gcc/fold-const.c
index 8e8a821..67a0217 100644
--- a/gcc/fold-const.c
+++ b/gcc/fold-const.c
@@ -7875,7 +7875,8 @@ fold (tree expr)
     case FLOOR_MOD_EXPR:
     case ROUND_MOD_EXPR:
     case TRUNC_MOD_EXPR:
-      if (integer_onep (arg1))
+      /* 0 % X is always zero as is X % 1.  */
+      if (integer_zerop (arg0) || integer_onep (arg1))
 	return omit_one_operand (type, integer_zero_node, arg0);
       if (integer_zerop (arg1))
 	return t;
-- 
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