[Bug rtl-optimization/97249] Missing vec_select and subreg optimization

[crazylht at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97249

--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
for i386 backend, maybe we can adjust pattern of

diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index 934b60a288f..2bfa9635fab 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -17658,12 +17658,7 @@ (define_expand "<code>v32qiv32hi2"
 (define_insn "sse4_1_<code>v8qiv8hi2<mask_name>"
   [(set (match_operand:V8HI 0 "register_operand" "=Yr,*x,v")
        (any_extend:V8HI
-         (vec_select:V8QI
-           (match_operand:V16QI 1 "register_operand" "Yr,*x,v")
-           (parallel [(const_int 0) (const_int 1)
-                      (const_int 2) (const_int 3)
-                      (const_int 4) (const_int 5)
-                      (const_int 6) (const_int 7)]))))]
+         (subreg:V8QI(match_operand:V16QI 1 "register_operand" "Yr,*x,v")
0)))]
   "TARGET_SSE4_1 && <mask_avx512bw_condition> && <mask_avx512vl_condition>"
   "%vpmov<extsuffix>bw\t{%1, %0<mask_operand2>|%0<mask_operand2>, %1}"
   [(set_attr "isa" "noavx,noavx,avx")