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    SubjectRe: writing portable code based on BITS_PER_LONG?
    On Sat, 2006-08-05 23:16:29 -0700, Om N. <xhandle@gmail.com> wrote:
    > I am trying to port a driver written for IA32. This is a pci driver
    > and has a chipset doing PCI <-> local bus data transfer, where local
    > bus is 16 bit. So a number of values are converted by right/left
    > shifting by 16 bits.
    >
    > Now that I am doing porting, I would like to make it fully portable
    > across AMD64 and IA32. What is the best method for this? Should I do
    > something like,
    >
    > #if BITS_PER_LONG = 64
    > shiftwidth = 48
    > #else if BITS_PER_LONG = 32
    > shiftwidth = 16
    > #endif

    I'd probably write some macros that access the parts of the longs you
    want to have/set and put these into some header file.

    MfG, JBG

    --
    Jan-Benedict Glaw jbglaw@lug-owl.de +49-172-7608481
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