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From: "prathamesh3492 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Date: Tue, 19 Jan 2021 15:38:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98636

--- Comment #13 from prathamesh3492 at gcc dot gnu.org ---
IIUC, the issue comes from the following mismatch in cl_optimization_compar=
e:

  if (ptr1->x_arm_fp16_format !=3D ptr2->x_arm_fp16_format)
    internal_error ("%<global_options%> are modified in local context");

x_arm_fp16_format is of following type defined in arm-opts.h:

/* Which __fp16 format to use.
   The enumeration values correspond to the numbering for the
   Tag_ABI_FP_16bit_format attribute.
 */
enum arm_fp16_format_type
{
  ARM_FP16_FORMAT_NONE =3D 0,
  ARM_FP16_FORMAT_IEEE =3D 1,
  ARM_FP16_FORMAT_ALTERNATIVE =3D 2
};

For the test-case passing -mfp16-format=3Dalternative results in:
ptr1->x_arm_fp16_format =3D=3D ARM_FP16_FORMAT_ALTERNATIVE and
ptr2->x_arm_fp16_format =3D=3D ARM_FP16_FORMAT_IEEE,
and the mismatch results in ICE.

Thanks,
Prathamesh=