Author: Dieter Buerssner
Date: 11:34:31 01/16/02
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On January 16, 2002 at 14:11:39, Bo Persson wrote: >On January 15, 2002 at 21:13:05, James Robertson wrote: > >>Suppose I write an inline function containing assembler code, or I just insert >>some assembler stuff in the middle of a large block of C code. Obviously, when I >>write my assembler lines I will be stomping on registers, simply because the >>syntax requires I use 'eax' or 'ebx' in such simple commands as 'mov eax,ebx'. >>Suppose though that I really don't care what registers are used and I would like >>the compiler to replace the registers in my assembler code with whatever it >>finds convenient and will best benefit the surrounding code. How can I do this? > >You can't. :-) With gcc you can. But explaining the gcc inline assembler synthax would take a lot of writing. The gcc manual has a nice chapter about it. Essentially, if you use "r" as constraint, gcc will allocate a general register for this. There are many more constraints. It is unfortunately not very easy to use. Regards, Dieter
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