[Bug target/121634] [14/15 Regression] internal compiler error: in new_binary_operation, at vector-builder.h:300 compiling highway gtest on LoongArch with -O2 -mlasx

[xry111 at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121634

--- Comment #4 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
(insn 10 9 11 2
  (set (reg:V4SI 82 [ _6 ])
       (plus:V4SI
         (mult:V4SI
           (sign_extend:V4SI
             (vec_select:V4HI (reg:V8HI 88) 
                              (parallel [
                                (const_int 1 [0x1])
                                (const_int 3 [0x3])
                                (const_int 5 [0x5])
                                (const_int 7 [0x7])
                              ])))
           (sign_extend:V8SI
             (vec_select:V4HI (reg:V8HI 88) 
                              (parallel [
                                (const_int 1 [0x1])
                                (const_int 3 [0x3])
                                (const_int 5 [0x5])
                                (const_int 7 [0x7])
                              ]))))
         (reg:V4SI 87))) "bad.ii":9:43 914 {simd_maddw_evod_v8hi_s}

Hmm, this seems making no sense.  Likely regressed by r15-7620.