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From: "meissner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/96791] ICE in convert_mode_scalar, at expr.c:412
Date: Wed, 25 Nov 2020 21:12:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96791

--- Comment #22 from Michael Meissner <meissner at gcc dot gnu.org> ---
When I wrote the original in power7 days, the intent was:

If the user said -mcpu=3Dpower7 (for 32-bit) and did not explicitly set eit=
her
-mabi=3Daltivec or -mabi=3Dno-altivec, that -mabi=3Daltivec would be set
automagically.

If the user said -mcpu=3Dpower7 and did specify whether the altivec was set=
, the
compiler would honor that request.

For 32-bit, I assume the problem may be our old friend TImode.  Other parts=
 of
the compiler, including the generic parts of block move assume that there m=
ust
be an integer mode as large as the largest non-vector mode.  We don't provi=
de
TImode in 32-bit, and that leads us to have to disable IEEE 128-bit hardware
support because we don't have a corresponding 128-bit integer for doing mov=
es.=20
Before OPAQUE we did define OImode and XImode, but never enabled them, and =
that
prevented some ICEs where the machine independent parts did not bother to c=
heck
if the get integer mode size that is n-bits returned NULL.=