From: Jakub Jelinek <jakub@redhat.com>
Date: Mon, 30 Oct 2017 16:20:24 +0000 (+0100)
Subject: re PR middle-end/22141 (Missing optimization when storing structures)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4403d99aef3dddbd11cb3d444b0febf2ea89eca9;p=gcc.git

re PR middle-end/22141 (Missing optimization when storing structures)

	PR middle-end/22141
	* gimple-ssa-store-merging.c (merged_store_group::apply_stores): Fix
	arguments to clear_bit_region_be.

From-SVN: r254228
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index dcef7ec7ec1..711458f428c 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2017-10-30  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/22141
+	* gimple-ssa-store-merging.c (merged_store_group::apply_stores): Fix
+	arguments to clear_bit_region_be.
+
 2017-10-30  Jim Wilson  <wilson@tuliptree.org>
 
 	* gimplify.c: Include memmodel.h.
diff --git a/gcc/gimple-ssa-store-merging.c b/gcc/gimple-ssa-store-merging.c
index fb68a815c87..5a5b776290a 100644
--- a/gcc/gimple-ssa-store-merging.c
+++ b/gcc/gimple-ssa-store-merging.c
@@ -701,7 +701,9 @@ merged_store_group::apply_stores ()
 	return false;
       unsigned char *m = mask + (pos_in_buffer / BITS_PER_UNIT);
       if (BYTES_BIG_ENDIAN)
-	clear_bit_region_be (m, pos_in_buffer % BITS_PER_UNIT, info->bitsize);
+	clear_bit_region_be (m, (BITS_PER_UNIT - 1
+				 - (pos_in_buffer % BITS_PER_UNIT)),
+			     info->bitsize);
       else
 	clear_bit_region (m, pos_in_buffer % BITS_PER_UNIT, info->bitsize);
     }