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The ISB (instruction synchronization barrier) might be too heavy for
START/STOPTIMER use but should be more accurate in checkasm where the
timing overhead is subtracted.
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This reverts commit c00365b46d464ce47716315c1801818d811bdb9a
in addition to using a different section.
Signed-off-by: Martin Storsjö <martin@martin.st>
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Not supported by Clang's integrated assembler. Since it just adds
debug information it can safely omitted.
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Both gnu as and clang treat lines starting with '#' as comments if they
aren't consumed by the C-style preprocessor.
Using '//' does not work with clang since comments are removed before
macro expansion.
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Clang's integrated assembler does not support it.
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This fixes building in PIC mode with gas. The examples in the gas
manual showed using a # here even though gas itself actually didn't
support that syntax (and the gas test suite only tests it without
the extra hash sign).
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
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Ported from arm NEON and added vector_dmul_scalar.
Functions between 1.5 and 5 times faster than the C implementations
using Apple's clang-503.0.19 on A7.
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Based on e3fec3f095ab5ea08ee662942d98526aaf5e3635 for arm.
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NEON and VFP are currently mandatory for all ARMv8 profiles. Both are
handled as extensions as far as cpuflags are concerned. This is
consistent with handling x86_64 which always has SSE2, but still
handles it as an extension.
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Signed-off-by: Janne Grunau <janne-libav@jannau.net>
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