From: Richard Stallman <rms@gnu.org>
Date: Sun, 31 Oct 1993 03:04:16 +0000 (+0000)
Subject: (convert_move): When extending to multi-word register
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a81fee56a95764ef7040351599e20506c879fa6a;p=gcc.git

(convert_move): When extending to multi-word register
via its low word, clobber the whole thing.

From-SVN: r5953
---

diff --git a/gcc/expr.c b/gcc/expr.c
index 0b1eb55f71c..7bf47682cd5 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -874,6 +874,8 @@ convert_move (to, from, unsignedp)
 	       && ((code = can_extend_p (to_mode, word_mode, unsignedp))
 		   != CODE_FOR_nothing))
 	{
+	  if (GET_CODE (to) == REG)
+	    emit_insn (gen_rtx (CLOBBER, VOIDmode, to));
 	  convert_move (gen_lowpart (word_mode, to), from, unsignedp);
 	  emit_unop_insn (code, to,
 			  gen_lowpart (word_mode, to), equiv_code);