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Re: glibc-2.1 on PowerPC cannot disable floating-point
- To: email@example.com
- Subject: Re: glibc-2.1 on PowerPC cannot disable floating-point
- From: Geoff Keating <firstname.lastname@example.org>
- Date: Thu, 11 Feb 1999 14:55:30 +1100
- CC: email@example.com, Franz.Sirlfirstname.lastname@example.org
- References: <9902102325.AA58542@marc.watson.ibm.com>
> Cc: Franz Sirl <Franz.Sirlemail@example.com>
> Date: Wed, 10 Feb 1999 18:25:52 -0500
> From: David Edelsohn <firstname.lastname@example.org>
> Was there a reason that the PowerPC port did not utilize the "fpu"
> structure of other ports (e.g., alpha, arm, i386, m68k, and sparc)? Can
> the floating-point functionality be moved into an "fpu" subdirectory so
> that it follows the structure of other ports and can be disabled?
Originally, I thought that the FPU was an essential part of the
powerpc architecture, and that it would have to be emulated if it did
not exist in hardware.
A fpu subdirectory is planned for glibc 2.2.
It is particularly complicated because the GCC floating-point emulator
doesn't emulate the powerpc multiply-add instruction, so anything that
depends on that must be moved into the fpu subdirectory too. This
amounts to basically all the powerpc math stuff.
Geoffrey Keating <email@example.com>