Multilib support for 68040
Aaron J. Grier
Tue Jan 22 12:05:00 GMT 2002
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:
Generate output for a 68040. This is the default when the
compiler is configured for 68040-based systems.
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.
> 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
Aaron J. Grier | Frye Electronics, Tigard, OR | email@example.com
"In a few thousand years people will be scratching their heads
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