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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/97170] Wrong optimization in fwprop pass
Date: Wed, 23 Sep 2020 05:49:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97170

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
target_fcvt is wrong.
try:
(define_insn "target_fcvt"
  [(set (match_operand:SI 0 "register_operand" "=3Dr")
        (unspec:SI [(match_operand:SF 1 "register_operand" "f")
                    (reg:SI FCVTMODE_REGNUM)]
        UNSPEC_FCVT))]
  ""
  "fcvt\t%0,%1"
)

instead.  Basically the set is not dependent on the reg (FCVTMODE_REGNUM) o=
nly
the instruction itself which is what ever.=