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build: Prefer NASM assembler over YASM
NASM is more actively maintained and permits generating dependency information
as a sideeffect of assembling, thus cutting build times in half.
(Cherry-picked from libav commit 57b753b445)
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Diego Biurrun
James Almer
parent
3cc73d3d6d
commit
4f9297ac3b
@ -6,7 +6,7 @@ os:
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addons:
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apt:
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packages:
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- yasm
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- nasm
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- diffutils
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compiler:
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- clang
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@ -17,7 +17,7 @@ cache:
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before_install:
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- if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew update --all; fi
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install:
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- if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install yasm; fi
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- if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install nasm; fi
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script:
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- mkdir -p ffmpeg-samples
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- ./configure --samples=ffmpeg-samples --cc=$CC
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@ -22,6 +22,8 @@ version <next>:
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- headphone audio filter
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- superequalizer audio filter
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- roberts video filter
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- The x86 assembler default switched from yasm to nasm, pass
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--x86asmexe=yasm to configure to restore the old behavior.
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version 3.3:
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- CrystalHD decoder moved to new decode API
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6
configure
vendored
6
configure
vendored
@ -3258,7 +3258,7 @@ pkg_config_default=pkg-config
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ranlib_default="ranlib"
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strip_default="strip"
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version_script='--version-script'
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x86asmexe_default="yasm"
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x86asmexe_default="nasm"
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windres_default="windres"
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nvcc_default="nvcc"
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nvccflags_default="-gencode arch=compute_30,code=sm_30 -O2"
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@ -5506,7 +5506,7 @@ EOF
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}
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if ! disabled_any asm mmx x86asm; then
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for program in $x86asmexe yasm nasm; do
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for program in $x86asmexe nasm yasm; do
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probe_x86asm $program
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test -n "$x86asm_type" && break
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done
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@ -5518,7 +5518,7 @@ EOF
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esac
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check_x86asm "movbe ecx, [5]" && enable x86asm ||
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die "yasm/nasm not found or too old. Use --disable-x86asm for a crippled build."
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die "nasm/yasm not found or too old. Use --disable-x86asm for a crippled build."
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check_x86asm "vextracti128 xmm0, ymm0, 0" || disable avx2_external
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check_x86asm "vpmacsdd xmm0, xmm1, xmm2, xmm3" || disable xop_external
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check_x86asm "vfmaddps ymm0, ymm1, ymm2, ymm3" || disable fma4_external
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@ -161,8 +161,8 @@ do{
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For x86, mark registers that are clobbered in your asm. This means both
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general x86 registers (e.g. eax) as well as XMM registers. This last one is
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particularly important on Win64, where xmm6-15 are callee-save, and not
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restoring their contents leads to undefined results. In external asm (e.g.
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yasm), you do this by using:
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restoring their contents leads to undefined results. In external asm,
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you do this by using:
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cglobal function_name, num_args, num_regs, num_xmm_regs
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In inline asm, you specify clobbered registers at the end of your asm:
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__asm__(".." ::: "%eax").
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@ -199,12 +199,12 @@ actual lines causing issues.
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Inline asm vs. external asm
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---------------------------
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Both inline asm (__asm__("..") in a .c file, handled by a compiler such as gcc)
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and external asm (.s or .asm files, handled by an assembler such as yasm/nasm)
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and external asm (.s or .asm files, handled by an assembler such as nasm/yasm)
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are accepted in FFmpeg. Which one to use differs per specific case.
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- if your code is intended to be inlined in a C function, inline asm is always
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better, because external asm cannot be inlined
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- if your code calls external functions, yasm is always better
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- if your code calls external functions, external asm is always better
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- if your code takes huge and complex structs as function arguments (e.g.
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MpegEncContext; note that this is not ideal and is discouraged if there
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are alternatives), then inline asm is always better, because predicting
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@ -71,9 +71,9 @@ Mac OS X on PowerPC or ARM (iPhone) requires a preprocessor from
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assembly functions. Put the Perl script somewhere
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in your PATH, FFmpeg's configure will pick it up automatically.
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Mac OS X on amd64 and x86 requires @command{yasm} to build most of the
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Mac OS X on amd64 and x86 requires @command{nasm} to build most of the
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optimized assembly functions. @uref{http://www.finkproject.org/, Fink},
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@uref{http://www.gentoo.org/proj/en/gentoo-alt/prefix/bootstrap-macos.xml, Gentoo Prefix},
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@uref{https://wiki.gentoo.org/wiki/Project:Prefix, Gentoo Prefix},
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@uref{https://mxcl.github.com/homebrew/, Homebrew}
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or @uref{http://www.macports.org, MacPorts} can easily provide it.
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@ -141,7 +141,7 @@ them under @command{MinGW-w64 Win64 Shell} and @command{MinGW-w64 Win32 Shell}.
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pacman -S make pkgconf diffutils
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# mingw-w64 packages and toolchains
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pacman -S mingw-w64-x86_64-yasm mingw-w64-x86_64-gcc mingw-w64-x86_64-SDL
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pacman -S mingw-w64-x86_64-nasm mingw-w64-x86_64-gcc mingw-w64-x86_64-SDL2
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@end example
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To target 32 bits replace @code{x86_64} with @code{i686} in the command above.
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@ -159,7 +159,7 @@ You will need the following prerequisites:
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@item @uref{http://code.google.com/p/msinttypes/, msinttypes}
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(if using MSVC 2012 or earlier)
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@item @uref{http://msys2.github.io/, MSYS2}
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@item @uref{http://yasm.tortall.net/, YASM}
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@item @uref{http://www.nasm.us/, NASM}
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(Also available via MSYS2's package manager.)
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@end itemize
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