From: Jim Wilson <wilson@gcc.gnu.org>
Date: Wed, 17 Jan 1996 23:56:06 +0000 (-0800)
Subject: (extract_bit_field): For multi-word bitfield, clobber target before
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=34ea783bd582e392bb7e1b7ee5435601d528ab03;p=gcc.git

(extract_bit_field): For multi-word bitfield, clobber target before
storing to it.

From-SVN: r11059
---

diff --git a/gcc/expmed.c b/gcc/expmed.c
index e79a8e2a49b..dbd7eb2bb4f 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -965,6 +965,9 @@ extract_bit_field (str_rtx, bitsize, bitnum, unsignedp,
       if (target == 0 || GET_CODE (target) != REG)
 	target = gen_reg_rtx (mode);
 
+      /* Indicate for flow that the entire target reg is being set.  */
+      emit_insn (gen_rtx (CLOBBER, VOIDmode, target));
+
       for (i = 0; i < nwords; i++)
 	{
 	  /* If I is 0, use the low-order word in both field and target;