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From: "sebastian.huber@embedded-brains.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/106680] Test gcc.target/powerpc/bswap64-4.c fails on
 32-bit BE
Date: Mon, 05 Feb 2024 13:08:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106680

--- Comment #10 from Sebastian Huber <sebastian.huber@embedded-brains.de> -=
--
(In reply to Kewen Lin from comment #9)
> Note that now we only disable implicit powerpc64 for -m32 when the
> OS_MISSING_POWERPC64 is set.
>=20
>   /* Don't expect powerpc64 enabled on those OSes with OS_MISSING_POWERPC=
64,
>      since they do not save and restore the high half of the GPRs correct=
ly
>      in all cases.  If the user explicitly specifies it, we won't interfe=
re
>      with the user's specification.  */
> #ifdef OS_MISSING_POWERPC64
>   if (OS_MISSING_POWERPC64
>       && TARGET_32BIT
>       && TARGET_POWERPC64
>       && !(rs6000_isa_flags_explicit & OPTION_MASK_POWERPC64))
>     rs6000_isa_flags &=3D ~OPTION_MASK_POWERPC64;
> #endif
>=20
> But rtems.h doesn't define OS_MISSING_POWERPC64

RTEMS supports the 64-bit PowerPC for the 64-bit multilibs.

>=20
> gcc/config/rs6000/linux.h:#define OS_MISSING_POWERPC64 1
> gcc/config/rs6000/freebsd64.h:#define OS_MISSING_POWERPC64 !TARGET_64BIT
> gcc/config/rs6000/aix.h:#define OS_MISSING_POWERPC64 1
> gcc/config/rs6000/linux64.h:#define OS_MISSING_POWERPC64 !TARGET_64BIT
>=20
> meanwhile cpu "e6500" has MASK_POWERPC64 set by default (it's 64bit core).
>=20
> That's why you still have powerpc64 flag set when you specify -m32 on rte=
ms.

For some applications, you don't need the 64-bit support on the e6500 machi=
nes.
So, we have 32-bit and 64-bit multilibs. This is just a performance
optimization for some applications.=