Hi, On Sun, Apr 24, 2011 at 2:06 AM, Uoti Urpala <[email protected]> wrote: > The current generic C implementation, which is always used when the > public header is included from other programs (either directly or > through intreadwrite.h) compiles to a mess like this (gcc-4.6 on AMD64): > movq %rdi, %rdx > shrq $32, %rdx > movl %edx, %eax > sall $8, %edx > shrl $8, %eax > andl $-16711936, %edx > andl $16711935, %eax > orl %edx, %eax > movl %edi, %edx > sall $8, %edi > shrl $8, %edx > andl $-16711936, %edi > roll $16, %eax > andl $16711935, %edx > orl %edi, %edx > roll $16, %edx > salq $32, %rdx > orq %rdx, %rax > ret > The builtin function produces just a bswap. > > If the built-in functions behave particularly badly on some less common > architecture then additional checks to exclude those could be > beneficial; but in any case this should be enabled at least for > amd64/x86.
Why not simply start distributing avconfig.h and also distribute arch-specific installed headers? Ronald _______________________________________________ libav-devel mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-devel
