[gcc(refs/users/guojiufu/heads/guojiufu-branch)] update comments and do not update case pr98064.cc

[Jiu Fu Guo <guojiufu@gcc.gnu.org>]

https://gcc.gnu.org/g:ce08a33145e1b5736595c4c5a600ea5443103d03

commit ce08a33145e1b5736595c4c5a600ea5443103d03
Author: Jiufu Guo <guojiufu@linux.ibm.com>
Date:   Wed Jun 9 19:17:02 2021 +0800

    update comments and do not update case pr98064.cc

Diff:
---
 gcc/testsuite/g++.dg/vect/pr98064.cc |  4 +---
 gcc/tree-ssa-loop-split.c            | 10 +++++-----
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/gcc/testsuite/g++.dg/vect/pr98064.cc b/gcc/testsuite/g++.dg/vect/pr98064.cc
index dcb2985d05a..74043ce7725 100644
--- a/gcc/testsuite/g++.dg/vect/pr98064.cc
+++ b/gcc/testsuite/g++.dg/vect/pr98064.cc
@@ -1,7 +1,5 @@
 // { dg-do compile }
-// { dg-additional-options "-O3 -Wno-stringop-overflow" }
-/* There is warning message when "short g = var_8; g; g++"
-   is optimized/analyzed as string operation,e.g. memset.  */
+// { dg-additional-options "-O3" }
 
 const long long &min(const long long &__a, long long &__b) {
   if (__b < __a)
diff --git a/gcc/tree-ssa-loop-split.c b/gcc/tree-ssa-loop-split.c
index 0365b6d069e..e9f23b32186 100644
--- a/gcc/tree-ssa-loop-split.c
+++ b/gcc/tree-ssa-loop-split.c
@@ -1664,9 +1664,9 @@ get_ne_cond_branch (struct loop *loop, tree *step)
 	return e;
 
       /* If exit edge is at end of header, and header contains i++ or ++i,
-	 only, it is simple to link the split loops:  jump from the end of
-	 one loop header to the new loop header, and use unchanged PHI
-	 result of first loop as the entry PHI value of the second loop.  */
+	 only, it is simple to link the split loops: jump from the end of
+	 one loop header to the new loop header, and use unchanged PHI result
+	 of the first loop as the entry PHI value of the second loop.  */
       if (bb == loop->header)
 	{
 	  /* Only one phi.  */
@@ -1793,7 +1793,7 @@ L_H:
  i++;
  goto L_H;
 
-The "i!=N" is like "i>N || i<N", then it could be transform to:
+The "i!=N" is like "i>N || i<N", then it could be transformed to:
 
 L_H:
  if (i>N)
@@ -1810,7 +1810,7 @@ L1_H:
  i++;
  goto L1_H;
 
-The loop with "i<N" is in favor both GIMPLE and RTL passes.  */
+The loop with "i<N" is in favor of both GIMPLE and RTL passes.  */
 
 static bool
 split_loop_on_ne_cond (class loop *loop)