addons:
apt:
packages:
- - yasm
+ - nasm
- diffutils
compiler:
- clang
before_install:
- if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew update --all; fi
install:
- - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install yasm; fi
+ - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install nasm; fi
script:
- mkdir -p libav-samples
- ./configure --samples=libav-samples --cc=$CC
- config.log and other configuration files moved into avbuild/ directory
- VAAPI-accelerated MPEG-2 and VP8 encoding
- Apple Pixlet decoder
+- The x86 assembler default switched from yasm to nasm, pass
+ --x86asmexe=yasm to configure to restore the old behavior.
version 12:
ar_default="ar"
cc_default="gcc"
host_cc_default="gcc"
-x86asmexe_default="yasm"
+x86asmexe_default="nasm"
ln_s="ln -s -f"
nm_default="nm -g"
pkg_config_default=pkg-config
}
if ! disabled_any asm mmx x86asm; then
- for program in $x86asmexe yasm nasm; do
+ for program in $x86asmexe nasm yasm; do
probe_x86asm $program
test -n "$x86asm_type" && break
done
esac
check_x86asm "movbe ecx, [5]" && enable x86asm ||
- die "yasm/nasm not found or too old. Use --disable-x86asm for a crippled build."
+ die "nasm/yasm not found or too old. Use --disable-x86asm for a crippled build."
check_x86asm "vextracti128 xmm0, ymm0, 0" || disable avx2_external
check_x86asm "vpmacsdd xmm0, xmm1, xmm2, xmm3" || disable xop_external
check_x86asm "vfmadd132ps ymm0, ymm1, ymm2" || disable fma3_external
For x86, mark registers that are clobbered in your asm. This means both
general x86 registers (e.g. eax) as well as XMM registers. This last one is
particularly important on Win64, where xmm6-15 are callee-save, and not
-restoring their contents leads to undefined results. In external asm (e.g.
-yasm), you do this by using:
+restoring their contents leads to undefined results. In external asm,
+you do this by using:
cglobal function_name, num_args, num_regs, num_xmm_regs
In inline asm, you specify clobbered registers at the end of your asm:
__asm__(".." ::: "%eax").
Inline asm vs. external asm
---------------------------
Both inline asm (__asm__("..") in a .c file, handled by a compiler such as gcc)
-and external asm (.s or .asm files, handled by an assembler such as yasm/nasm)
+and external asm (.s or .asm files, handled by an assembler such as nasm/yasm)
are accepted in Libav. Which one to use differs per specific case.
- if your code is intended to be inlined in a C function, inline asm is always
better, because external asm cannot be inlined
-- if your code calls external functions, yasm is always better
+- if your code calls external functions, external asm is always better
- if your code takes huge and complex structs as function arguments (e.g.
MpegEncContext; note that this is not ideal and is discouraged if there
are alternatives), then inline asm is always better, because predicting
assembly functions. Put the Perl script somewhere
in your PATH, Libav's configure will pick it up automatically.
-OS X on AMD64 and x86 requires @command{yasm} to build most of the
+OS X on AMD64 and x86 requires @command{nasm} to build most of the
optimized assembly functions @url{http://mxcl.github.com/homebrew/, Homebrew},
-@url{http://www.gentoo.org/proj/en/gentoo-alt/prefix/bootstrap-macos.xml, Gentoo Prefix}
+@url{https://wiki.gentoo.org/wiki/Project:Prefix, Gentoo Prefix}
or @url{http://www.macports.org, MacPorts} can easily provide it.
pacman -S make pkgconf diffutils
# mingw-w64 packages and toolchains
-pacman -S mingw-w64-x86_64-yasm mingw-w64-x86_64-gcc mingw-w64-x86_64-SDL
+pacman -S mingw-w64-x86_64-nasm mingw-w64-x86_64-gcc mingw-w64-x86_64-SDL
@end example
To target 32 bits replace @code{x86_64} with @code{i686} in the command above.
@item @uref{http://code.google.com/p/msinttypes/, msinttypes}
(if using MSVC 2012 or earlier)
@item @uref{http://msys2.github.io/, MSYS2}
-@item @uref{http://yasm.tortall.net/, YASM}
+@item @uref{http://www.nasm.us/, NASM}
(Also available via MSYS2's package manager.)
@end itemize
To set up a proper environment in MSYS2, you need to run @code{msys_shell.bat} from
the Visual Studio or Intel Compiler command prompt.
-Place @code{yasm.exe} somewhere in your @code{PATH}. If using MSVC 2012 or
+Place @code{nasm.exe} somewhere in your @code{PATH}. If using MSVC 2012 or
earlier, place @code{c99wrap.exe} and @code{c99conv.exe} somewhere in your
@code{PATH} as well.
@uref{http://sourceware.org/cygwinports/, Cygwin Ports}:
@example
-yasm, libSDL-devel, libfaac-devel, libgsm-devel, libmp3lame-devel,
+nasm, libSDL-devel, libfaac-devel, libgsm-devel, libmp3lame-devel,
libschroedinger1.0-devel, speex-devel, libtheora-devel, libxvidcore-devel
@end example