on 2020/4/2 上午6:51, H.J. Lu wrote:
> 
> This caused:
> 
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94449
> 

Thanks for reporting this.  The attached patch is to fix the stupid
mistake by using gsi_insert_seq_before instead of gsi_insert_before.

BTW, the regression testing on one x86_64 machine from CFarm is 
unable to reveal it (I guess due to native arch sandybridge?), so I
specified additional option -march=znver2 and verified the coverage.

Bootstrapped/regtested on powerpc64le-linux-gnu (P9) and 
x86_64-pc-linux-gnu, also verified the fail cases in related PRs.


BR,
Kewen
-----------
gcc/ChangeLog

2020-04-02  Kewen Lin  <linkw@gcc.gnu.org>

	PR tree-optimization/94443
	* tree-vect-loop.c (vectorizable_live_operation): Use
	gsi_insert_seq_before to replace gsi_insert_before.

gcc/testsuite/ChangeLog

2020-04-02  Kewen Lin  <linkw@gcc.gnu.org>

	PR tree-optimization/94443
	* gcc.dg/vect/pr94443.c: New test.