Make *really* take '--with-ns-mode'-option into account.
Before it was bogus (wrong if-check) and it always resulted
in the float version being used.
Signed-off-by: Mirko Vogt <mirko-dev@nanl.de>
The current architecture detection, based on the "host_cpu" part of the
tuple does not work properly for a number of reason:
- The code assumes that if host_cpu starts with "arm" then ARM
instructions are available, which is incorrect. Indeed, Cortex-M
platforms can run Linux, they are ARM platforms (so host_cpu = arm),
but they don't support ARM instructions: they support only the
Thumb-2 instruction set.
- The armv7 case is also not very useful, as it is not standard at all
to pass armv7 as host_cpu even if the host system is actually ARMv7
based.
- For the same reason, the armv8 case is not very useful: ARMv8 is
AArch64, and there is already a separate case to handle this
architecture.
So, this commit moves away from a host_cpu based logic, and instead
tests using AC_CHECK_DECLS() the built-in definitions of the compiler:
- If we have __ARM_ARCH_ISA_ARM defined, then it's an ARM processor
that supports the ARM instruction set (this allows to exclude Thumb-2
only processors).
- If we have __ARM_ARCH_7A__, then we have an ARMv7-A processor, and
we can enable the corresponding optimizations
- Same for __aarch64__, __i386__ and __x86_64__.
In addition, we remove the AC_MSG_ERROR() that makes the build fail for
all architectures but the ones that are explicitly supported. Indeed,
webrtc-audio-processing builds just fine for other architectures (tested
on MIPS), it's just that none of the architecture-specific optimizations
will be used.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
On x86, SSE optimisations are always compiled in, and used based on
runtime checks.
On ARM, we try to autodetect NEON support (with an option of runtime
detection). This has not been build-tested on ARM yet.
This leaves MIPS to be done.
Corresponds to upstream commit 524e9b043e7e86fd72353b987c9d5f6a1ebf83e1
Update notes:
* Pull in third party license file
* Replace .gypi files with BUILD.gn to keep track of what changes
upstream
* Bunch of new filse pulled in as dependencies
* Won't build yet due to changes needed on top of these
Corresponds to upstream commit 524e9b043e7e86fd72353b987c9d5f6a1ebf83e1
Update notes:
* Moved src/ to webrtc/ to easily diff against the third_party/webrtc
in the chromium tree
* ARM/NEON/MIPS support is not yet hooked up
* Tests have not been copied
