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Re: cr logical instruction for powerpc target


David Edelsohn wrote:

=?ISO-8859-1?Q?R=E9gis Odey=E9?= writes:



Regis> Do you know if there is any specific options of GCC to replace those CR Regis> logical instructions by another instructions sequences (using copies of Regis> CRs to GPR and logical operation on the GPRs) ?


There are no specific options to perform that operation.



Thanks for those answers.

For your information, my questions were related to an erratum of the PPC750GX (erratum #8 in errata notice v1.2):
Move Condition Register Field (mcrf) and logical condition register instructions (e.g. cror, crand, etc.) will not operate at the rated maximum frequency of the processor. As a consequence, the condition register contents may be incorrect.


So we probably have to decrease the frequency of those processors. Not a very good news.

Regards.

--
Régis Odeyé
Thales Computers, a Thales company. www.thalescomputers.com
E-mail: rod@thalescomputers.fr
Tel: +33 (0)4 98 16 34 86 - Fax: +33 (0)4 98 16 34 01



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