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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/90497] [10 Regression] Broken bootstrap on i686-linux
Date: Fri, 03 Apr 2020 11:01:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D90497

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
Why do we have

define_expand "sse2_umulv1siv1di3"
  [(set (match_operand:V1DI 0 "register_operand")
        (mult:V1DI
          (zero_extend:V1DI
            (vec_select:V1SI
              (match_operand:V2SI 1 "nonimmediate_operand")
              (parallel [(const_int 0)])))
          (zero_extend:V1DI
            (vec_select:V1SI
              (match_operand:V2SI 2 "nonimmediate_operand")
              (parallel [(const_int 0)])))))]
  "TARGET_SSE2"
  "ix86_fixup_binary_operands_no_copy (MULT, V2SImode, operands);")

i386-builtin.def:BDESC (OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_MMX, 0,
CODE_FOR_sse2_umulv1siv1di3, "__builtin_ia32_pmuludq", IX86_BUILTIN_PMULUDQ,
UNKNOWN, (int) V1DI_FTYPE_V2SI_V2SI)

sse2_umulv1siv1di3 isn't available with MMX.=