From: Richard Kenner <kenner@gcc.gnu.org>
Date: Sun, 31 Jan 1993 22:44:48 +0000 (-0500)
Subject: (simplify_and_const_int): Never consider bits outside of MODE.
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fc06d7aaee369e5d8847640c7fc2b16c98a0dc68;p=platform%2Fupstream%2Fgcc.git

(simplify_and_const_int): Never consider bits outside of MODE.

From-SVN: r3398
---

diff --git a/gcc/combine.c b/gcc/combine.c
index 8be5a05..1bf0405 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -5899,8 +5899,11 @@ simplify_and_const_int (x, mode, varop, constop)
   if (GET_CODE (varop) == CONST_INT)
     return GEN_INT (constop & INTVAL (varop));
 
-  /* See what bits may be nonzero in VAROP.  */
-  nonzero = nonzero_bits (varop, mode);
+  /* See what bits may be nonzero in VAROP.  Unlike the general case of
+     a call to nonzero_bits, here we don't care about bits outside
+     MODE.  */
+
+  nonzero = nonzero_bits (varop, mode) & GET_MODE_MASK (mode);
 
   /* Turn off all bits in the constant that are known to already be zero.
      Thus, if the AND isn't needed at all, we will have CONSTOP == NONZERO_BITS