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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/105012] [12 Regression] wrf from SPECCPU2017 ICEs
 during LTO linking since r12-7692-g8db155ddf8cec9
Date: Tue, 22 Mar 2022 11:06:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105012

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|lto                         |fortran

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, it's CCP, but likely transforming

MEM[p_1] =3D CLOBBER;

into

derf =3D CLOBBER;

by means of propagating a p_1 =3D &derf;

Such clobber is useless but we possibly have to deal with it.  Note I wonder
why
the operand scanner doesn't ICE here ...

Indeed we have

;; Function erfcx_r4 (__error_function_MOD_erfcx_r4, funcdef_no=3D0,
decl_uid=3D4215, cgraph_uid=3D1, symbol_order=3D0)

__attribute__((fn spec (". r ")))
real(kind=3D4) erfcx_r4 (real(kind=3D4) & restrict x)
{
  real(kind=3D4) __result_erfcx_r4(address-taken);
  static integer(kind=3D4) jint(address-taken) =3D 2;
  real(kind=3D4) (*<T66a>) (real(kind=3D4) & restrict) erfcx_r4.0_1;
  real(kind=3D4) _6;

  <bb 2> :
  erfcx_r4.0_1 =3D erfcx_r4;
  *erfcx_r4.0_1 =3D{v} {CLOBBER};
  calerf_r4 (x_4(D), &__result_erfcx_r4(address-taken), &jint(address-taken=
));
  _6 =3D __result_erfcx_r4(address-taken);

and .original already has

__attribute__((fn spec (". r ")))
real(kind=3D4) erfcx_r4 (real(kind=3D4) & restrict x)
{
  static integer(kind=3D4) jint(address-taken) =3D 2;
  real(kind=3D4) __result_erfcx_r4(address-taken);

  erfcx_r4 =3D {CLOBBER};
  calerf_r4 ((real(kind=3D4) *) x, &__result_erfcx_r4(address-taken),
&jint(address-taken));
  return __result_erfcx_r4(address-taken);
}=