[gcc(refs/users/guojiufu/heads/personal-branch)] Fix off-by-one error in previous commit

[Jiu Fu Guo]

https://gcc.gnu.org/g:2815558a2dbd0ee73de4bf01abb36d609026da6e

commit 2815558a2dbd0ee73de4bf01abb36d609026da6e
Author: Eric Botcazou <ebotcazou@gcc.gnu.org>
Date:   Thu May 28 19:29:42 2020 +0200

    Fix off-by-one error in previous commit
    
    The bitregion_end field points to the next bit after the region.
    
    gcc/ChangeLog
            * gimple-ssa-store-merging.c (merged_store_group::can_be_merged_into):
            Fix off-by-one error.

Diff:
---
 gcc/gimple-ssa-store-merging.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/gimple-ssa-store-merging.c b/gcc/gimple-ssa-store-merging.c
index 400a0010c34..3ab614148a7 100644
--- a/gcc/gimple-ssa-store-merging.c
+++ b/gcc/gimple-ssa-store-merging.c
@@ -1874,7 +1874,7 @@ merged_store_group::can_be_merged_into (store_immediate_info *info)
 	  || stores[0]->rhs_code == BIT_INSERT_EXPR)
       && info->bitregion_start == stores[0]->bitregion_start
       && info->bitregion_end == stores[0]->bitregion_end
-      && info->bitregion_end - info->bitregion_start < MAX_FIXED_MODE_SIZE)
+      && info->bitregion_end - info->bitregion_start <= MAX_FIXED_MODE_SIZE)
     return true;
 
   if (stores[0]->rhs_code == MEM_REF
@@ -1882,7 +1882,7 @@ merged_store_group::can_be_merged_into (store_immediate_info *info)
 	  || info->rhs_code == BIT_INSERT_EXPR)
       && info->bitregion_start == stores[0]->bitregion_start
       && info->bitregion_end == stores[0]->bitregion_end
-      && info->bitregion_end - info->bitregion_start < MAX_FIXED_MODE_SIZE)
+      && info->bitregion_end - info->bitregion_start <= MAX_FIXED_MODE_SIZE)
     return true;
 
   return false;