From: David Edelsohn <edelsohn@gnu.org>
Date: Fri, 13 Jul 2001 15:05:51 +0000 (+0000)
Subject: * combine.c (try_combine): Ensure const_int pow2 is positive.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1568d79b849057c16e3e4796b4c2b4335bb3a4ca;p=gcc.git

* combine.c (try_combine): Ensure const_int pow2 is positive.

From-SVN: r43983
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c80f159db84..57ea335d5c0 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2001-07-13  David Edelsohn  <edelsohn@gnu.org>
+
+	* combine.c (try_combine): Ensure const_int pow2 is positive.
+
 2001-07-13  Hartmut Penner  <hpenner@de.ibm.com>
 
         * config.gcc: Add configuration for s/390. 
diff --git a/gcc/combine.c b/gcc/combine.c
index 6972d85fc09..2557d758367 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -2235,6 +2235,7 @@ try_combine (i3, i2, i1, new_direct_jump_p)
 	     appeared to be a memory address.  This is a kludge.  */
 	  if (split_code == MULT
 	      && GET_CODE (XEXP (*split, 1)) == CONST_INT
+	      && INTVAL (XEXP (*split, 1)) > 0
 	      && (i = exact_log2 (INTVAL (XEXP (*split, 1)))) >= 0)
 	    {
 	      SUBST (*split, gen_rtx_ASHIFT (split_mode,