From: Diego Novillo <dnovillo@redhat.com>
Date: Fri, 20 Jul 2001 17:47:03 +0000 (+0000)
Subject: combine.c (combine_simplify_rtx): Generate a new shift operation when simplifying... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=9def18da54cfc452cf859502c56063ad0a904b35;p=gcc.git

combine.c (combine_simplify_rtx): Generate a new shift operation when simplifying the first operand of a (neg...


	* combine.c (combine_simplify_rtx): Generate a new shift operation
	when simplifying the first operand of a (neg (ashift)) expression.

From-SVN: r44202
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index bfa00fa5d82..768715ea0e4 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2001-07-20  Diego Novillo  <dnovillo@redhat.com>
+
+	* combine.c (combine_simplify_rtx): Generate a new shift operation
+	when simplifying the first operand of a (neg (ashift)) expression.
+
 2001-07-20  Roman Lechtchinsky  <rl@cs.tu-berlin.de>
 
 	* regclass.c (N_REG_INTS): Use only 32 bits per element.
diff --git a/gcc/combine.c b/gcc/combine.c
index 8658aadbddb..724e9ef1397 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -3921,10 +3921,7 @@ combine_simplify_rtx (x, op0_mode, last, in_dest)
 	  temp = simplify_unary_operation (NEG, mode,
 					   XEXP (XEXP (x, 0), 0), mode);
 	  if (temp)
-	    {
-	      SUBST (XEXP (XEXP (x, 0), 0), temp);
-	      return XEXP (x, 0);
-	    }
+	    return gen_binary (ASHIFT, mode, temp, XEXP (XEXP (x, 0), 1));
 	}
 
       temp = expand_compound_operation (XEXP (x, 0));