Define positive return values as non errors and leave further meaning undefined
This allows future extensions to use these values
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
The new syntax is preferred since it allows backward syntax compatibility
with libswr when switching to the new option handling code with
AV_OPT_TYPE_CHANNEL_LAYOUT.
With the new parser the string:
1234
is interpreted as a channel layout mask, rather than as a number of
channels, and thus it's compatible with the current way to set a channel
layout as an integer (e.g. for the icl and ocl options) making use of
integer option values.
ff_get_channel_layout() with compat=0 will be used in the
AV_OPT_TYPE_CHANNEL handler code.
The user is encouraged to switch to the new forward compatible syntax,
which requires to put a trailing "c" when specifying a layout as a number
of channels.
This makes sure that pointers from av_strdup are reallocable,
which is used in av_dict_set if the AV_DICT_APPEND flag is set.
Nothing should rely on pointers from av_strdup being aligned.
Signed-off-by: Martin Storsjö <martin@martin.st>
* commit 'c108ba0175d4fc3a3253a8b0f782fbfb96ba5098':
x86inc: Use VEX-encoded instructions in AVX functions
Merged-by: Michael Niedermayer <michaelni@gmx.at>
This is so we can sync to x264's version of FMA4 support.
This partialy reverts commit 79687079a9.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Automatically use VEX-encoding in AVX/AVX2/XOP/FMA3/FMA4
functions for all instructions that exists in a VEX-encoded
version.
This change makes it easier to extend existing code to use AVX2.
Also add support for AVX emulation of a few instructions that
were missing before.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
* commit '47f9d7ce5493e119e09d1227d017414feaaf8d97':
x86inc: Check for __OUTPUT_FORMAT__ having a value of "x64"
Merged-by: Michael Niedermayer <michaelni@gmx.at>
* commit 'bbe4a6db44f0b55b424a5cc9d3e89cd88e250450':
x86inc: Utilize the shadow space on 64-bit Windows
Merged-by: Michael Niedermayer <michaelni@gmx.at>
* commit '63f0d623100bdb0c6081456127f4b6713e83d3db':
x86inc: Use SSE instead of SSE2 for copying data
Merged-by: Michael Niedermayer <michaelni@gmx.at>
* commit 'ad76e6e7e193b98e7335156422d35467816f9ef1':
x86inc: Set ELF hidden visibility for global constants
Merged-by: Michael Niedermayer <michaelni@gmx.at>
Prevents a crash if the misaligned exception mask bit is
cleared for some reason.
Misaligned SSE functions are only used on AMD Phenom CPUs
and the benefit is miniscule. They also require modifying
the MXCSR control register and by removing those functions
we can get rid of that complexity altogether.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Store XMM6 and XMM7 in the shadow space in functions that
clobbers them. This way we don't have to adjust the stack
pointer as often, reducing the number of instructions as
well as code size.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
SWAP with >=3 named (rather than numbered) args
PERMUTE followed by SWAP with 2 named args
used to produce the wrong permutation
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
