From: Jeff Law <law@gcc.gnu.org>
Date: Tue, 14 Apr 1998 08:04:21 +0000 (-0600)
Subject: combine.c (simplify_rtx, [...]): Respect value of TRULY_NOOP_TRUNCATION.
X-Git-Tag: prereleases/egcs-1.1-prerelease~1716
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=80608e279347300c822a048eb4b37b607f930b76;p=thirdparty%2Fgcc.git

combine.c (simplify_rtx, [...]): Respect value of TRULY_NOOP_TRUNCATION.

8
        * combine.c (simplify_rtx, case TRUNCATE): Respect value of
        TRULY_NOOP_TRUNCATION.

From-SVN: r19204
---

diff --git a/gcc/combine.c b/gcc/combine.c
index c831be1052a8..66de17e66889 100644
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -3736,7 +3736,9 @@ simplify_rtx (x, op0_mode, last, in_dest)
       if (GET_MODE_CLASS (mode) == MODE_PARTIAL_INT)
 	break;
 
-      if (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT)
+      if (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT
+	  && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
+				    GET_MODE_BITSIZE (GET_MODE (XEXP (x, 0)))))
 	SUBST (XEXP (x, 0),
 	       force_to_mode (XEXP (x, 0), GET_MODE (XEXP (x, 0)),
 			      GET_MODE_MASK (mode), NULL_RTX, 0));