From: Richard Kenner <kenner@gcc.gnu.org>
Date: Thu, 1 Dec 1994 00:07:49 +0000 (-0500)
Subject: (convert_move): When emit multiword conversion, force FROM into a new
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5c5033c3c741a6700e363449c7671476d46df5ac;p=gcc.git

(convert_move): When emit multiword conversion, force FROM into a new
pseudo-reg if it overlaps TO.

From-SVN: r8593
---

diff --git a/gcc/expr.c b/gcc/expr.c
index 4c2ac5470d7..f109293e62f 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -916,6 +916,12 @@ convert_move (to, from, unsignedp)
       /* No special multiword conversion insn; do it by hand.  */
       start_sequence ();
 
+      /* Since we will turn this into a no conflict block, we must ensure
+	 that the source does not overlap the target.  */
+
+      if (reg_overlap_mentioned_p (to, from))
+	from = force_reg (from_mode, from);
+
       /* Get a copy of FROM widened to a word, if necessary.  */
       if (GET_MODE_BITSIZE (from_mode) < BITS_PER_WORD)
 	lowpart_mode = word_mode;