From: Jim Wilson <wilson@gcc.gnu.org>
Date: Fri, 24 Dec 1993 20:20:44 +0000 (-0800)
Subject: (convert_modes): Can't truncate REG with gen_lowpart if
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2bf29316da96818c2db73220318bce5679431c98;p=gcc.git

(convert_modes): Can't truncate REG with gen_lowpart if
TRULY_NOOP_TRUNCATION doesn't allow it.

From-SVN: r6306
---

diff --git a/gcc/expr.c b/gcc/expr.c
index ed9f6eb2882..f31ad280385 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -1223,7 +1223,9 @@ convert_modes (mode, oldmode, x, unsignedp)
 	      || (GET_MODE_SIZE (mode) <= GET_MODE_SIZE (oldmode)
 		  && ((GET_CODE (x) == MEM && ! MEM_VOLATILE_P (x)
 		       && direct_load[(int) mode])
-		      || GET_CODE (x) == REG)))))
+		      || (GET_CODE (x) == REG
+			  && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
+						    GET_MODE_BITSIZE (GET_MODE (x)))))))))
     {
       /* ?? If we don't know OLDMODE, we have to assume here that
 	 X does not need sign- or zero-extension.   This may not be