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-----Original Message----- From: Aaron J. Grier [mailto:aaron@frye.com] Sent: Tuesday, January 22, 2002 10:59 AM To: Glynn Smith Cc: crossgcc@sourceware.cygnus.com Subject: Re: Multilib support for 68040 On Mon, Jan 21, 2002 at 12:26:18PM -0800, Glynn Smith wrote: > I am using gcc 2.95.2 configured as a Cross m68k compiler hosted on > PPC-LINUX. The standard multi-lib support seems to be for 68000 68020 > 68881 & soft-float. and cpu32 and m5200. :) > Question 1 > > Can this version or a later version of the GCC compiler be configured > so that it generates a 68040 multilib branch uses only floating point > instruction from the set of instructions that are supported by the > 68040 FPCP and does NOT emulate the unsupported instructions using > FLINE TRAPS according to the documentation for 2.95.2, yes: `-m68040' Generate output for a 68040. This is the default when the compiler is configured for 68040-based systems. Where is this default configured and how do I see what my default is? This option inhibits the use of 68881/68882 instructions that have to be emulated by software on the 68040. Use this option if your 68040 does not have code to emulate those instructions. How do I configure the compiler for multilib support for -m68040 so that libraries get built with this option? > Question 2 > Motorola FPCPs have the option of setting them up so that the floating > point precession is embedded in each floating point instruction rather > that setting the precession in the FPCR (Control register) before each > operation. Is there a compiler flag to enable this option? I have no idea. have you disassembled code to see what the compiler default is? -- Aaron J. Grier | Frye Electronics, Tigard, OR | aaron@frye.com "In a few thousand years people will be scratching their heads wondering how on earth the first computer was invented and bootstrapped without a prior computer to do it with." -- Chris Malcolm, on comp.arch ------ Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ Want to unsubscribe? Send a note to crossgcc-unsubscribe@sources.redhat.com
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