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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/110311] [14 Regression] regression in
 tree-optimizer
Date: Fri, 30 Jun 2023 19:47:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110311

--- Comment #39 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
(In reply to anlauf from comment #36)
> Breakpoint 2, rng_stream.rng_stream_s::mmm_mod (x1=3D330289839997,
> x2=3D4294967087) at rng_stream_sub.f90:336
> 336         res =3D mod (x1, x2)
> (gdb) info float
>   R7: Valid   0x401be51fb57800000000 +480507567=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20
>   R6: Valid   0x401be51fb57800000000 +480507567=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20
>   R5: Zero    0x00000000000000000000 +0=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
>   R4: Zero    0x00000000000000000000 +0=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
>   R3: Zero    0x00000000000000000000 +0=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
>   R2: Zero    0x00000000000000000000 +0=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
>   R1: Zero    0x00000000000000000000 +0=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
> =3D>R0: Special 0xffff0000000004f5dc90 Unsupported

Here is the problem. FPREM chokes on invalid input in R0.

[1] Says that IA (invalid arithmetic) exception is generated for unsupported
format, and this is what happened above:

#IA     Source operand is an SNaN value, modulus is 0, dividend is =E2=88=
=9E, or
unsupported format.

[1] https://www.felixcloutier.com/x86/fprem=