[Ffmpeg-devel] gcc4 support & MMX fixups (from Debian) (original) (raw)

Pawel Sikora pluto
Thu Feb 2 10:36:02 CET 2006

On Thu, 2 Feb 2006, Michael Niedermayer wrote:

Hi

On Thu, Feb 02, 2006 at 09:41:37AM +0100, Pawe? Sikora wrote:

I suggest we should use a sizet type for params like *stride to avoid (on x86-64) unneeded 32<->64 conversions.

no, sizet is unsigned, stride must be signed! Right, I think offt from sys/types.h is a good candidate. It's signed, on x86-32 has 32 bits, on x86-64 has 64 bits. NO! -- Data Type: offt This is an arithmetic data type used to represent file sizes. In the GNU system, this is equivalent to fpost' or long int'. If the source is compiled with FILEOFFSETBITS == 64' this type_ _is transparently replaced by off64t'.

Ok, last attempt - ptrdiff_t.

C and C++ define a special type for pointer arithmetic, namely ptrdiff_t, which is a typedef of a platform-specific signed integral type. You can use a variable of type ptrdiff_t to store the result of subtracting and adding pointers.

-- to_be || !to_be == 1, to_be | ~to_be == -1

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