[Bug target/109855] [14 Regression] ICE: in curr_insn_transform, at lra-constraints.cc:4231 unable to generate reloads for {aarch64_mlav4hi_vec_concatz_le} at -O1

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109855

--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
---
Looking at the mddump file, the output predicate and constraint
seem to have gone AWOL:

;; /home/ricsan01/gnu/src/gcc/gcc/config/aarch64/aarch64-simd.md: 1554
(define_insn ("aarch64_mlav4hi_vec_concatz_le")
     [
        (set (match_operand:V8HI 0 ("") (""))
            (vec_concat:V8HI (plus:V4HI (mult:V4HI (match_operand:V4HI 2
("register_operand") ("w"))
                        (match_operand:V4HI 3 ("register_operand") ("w")))
                    (match_operand:V4HI 1 ("register_operand") ("0")))
                (match_operand:V4HI 4 ("aarch64_simd_or_scalar_imm_zero")
(""))))
    ] ("(!BYTES_BIG_ENDIAN) && (TARGET_SIMD)") ("mla\t%0.4h, %2.4h, %3.4h")
     [
        (set_attr ("type") ("neon_mla_h"))
        (set_attr ("add_vec_concat_subst_le") ("no"))
    ])