[Bug target/66174] [6 Regression] ICE: in extract_insn, at recog.c:2341 (unrecognizable insns) with -ftree-vectorize -mavx512ifma

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66174

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
The problem is in i386.c, function expand_vec_perm_blend, where:

  /* This matches five different patterns with the different modes.  */
  x = gen_rtx_VEC_MERGE (vmode, op1, op0, GEN_INT (mask));
  x = gen_rtx_SET (target, x);
  emit_insn (x);

AVX512F modes need to move mask to a mask register.