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From: "aoliva at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/104121] [12 Regression] v850: Infinite loop in
 find_reload_regno_insns() since
 r12-5852-g50e8b0c9bca6cdc57804f860ec5311b641753fbb
Date: Fri, 18 Feb 2022 15:20:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104121

--- Comment #10 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
and then, as I reduced it myself down to the following and compared with the
minimized test, I've finally turned on both of my neurons ;-) and it finally
hit me: "only with -mv850e2v3" didn't mean "not with other multilibs", but
rather "without any optimization".  of course, none of the minimized test w=
ould
survive with optimization.  doh!

this one triggers with -O2 -g -mv850e2v3:

typedef float DFtype __attribute__ ((mode (DF)));
typedef _Complex float DCtype __attribute__ ((mode (DC)));
DCtype
__muldc3 (DFtype a, DFtype b, DFtype c, DFtype d)
{
   DFtype x =3D __builtin_huge_val () * (a * c - b * d);
   DFtype y =3D __builtin_huge_val () * (a * d + b * c);

   DCtype res;
  __real__ res =3D x;
  __imag__ res =3D y;
  return res;
}=