Date: Sun, 24 Feb 2008 00:51:19 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: das@freebsd.org Cc: cvs-src@freebsd.org, marcel@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/powerpc/fpu fpu_add.c fpu_arith.h fpu_compare.c fpu_div.c fpu_emu.c fpu_emu.h fpu_explode.c fpu_extern.h fpu_implode.c fpu_instr.h fpu_mul.c fpu_sqrt.c fpu_subr.c Message-ID: <20080224.005119.1260396910.imp@bsdimp.com> In-Reply-To: <20080224063836.GB42714@zim.MIT.EDU> References: <200802232005.m1NK5R60022761@repoman.freebsd.org> <20080224063836.GB42714@zim.MIT.EDU>
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In message: <20080224063836.GB42714@zim.MIT.EDU>
David Schultz <das@FreeBSD.org> writes:
: On Sat, Feb 23, 2008, Marcel Moolenaar wrote:
: > marcel 2008-02-23 20:05:27 UTC
: >
: > FreeBSD src repository
: >
: > Added files:
: > sys/powerpc/fpu fpu_add.c fpu_arith.h fpu_compare.c
: > fpu_div.c fpu_emu.c fpu_emu.h
: > fpu_explode.c fpu_extern.h fpu_implode.c
: > fpu_instr.h fpu_mul.c fpu_sqrt.c
: > fpu_subr.c
: > Log:
: > Add a floating-point emulator so that a single userland or single ABI
: > can run on processors that don't have a FPU. This is typically the
: > case for Book E processors. While a tuned system will probably want
: > to use soft-float (or use a processor that has a FPU if the usage is
: > FP intensive enough), allowing hard-float on FPU-less systems gives
: > great portability and flexibility.
: >
: > Obtained from: NetBSD
:
: It looks like everything except for fpu_emu.? and fpu_instr.h is
: pretty generic, and surely there are other architectures (e.g.,
: ARM, low-power 486-SX clones) that could use in-kernel FP emulation.
: Do you think it's worthwhile to separate the MI bits and put them
: somewhere other than sys/powerpc, or is the plan to burn that
: bridge when we get to it?
I'd say the first new architecture to want to use this (ARM, 486SX or
MIPS) should pay the freight for that.
Warner
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