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add runtime NEON detection

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configure gets 2 new options:
--enable-neon / --enable-neon-rtcd

the NEON modules are split to their own convenience lib and built with
auto-detected flags if none are given via CFLAGS.

the /proc/cpuinfo check will only be used for armv7 targets whose
toolchain does not enable NEON by default or didn't have NEON forced by
the CFLAGS from the environment.

Change-Id: I2755bc1d065d5d6ee6143b44978c2082f8bef1c5
This commit is contained in:
James Zern
2016-04-18 23:31:42 -07:00
parent c80b9fc8fc
commit 74fb56fb5d
4 changed files with 100 additions and 9 deletions
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3
src/dsp/dsp.h
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@ -72,7 +72,8 @@ extern "C" {
// The intrinsics currently cause compiler errors with arm-nacl-gcc and the
// inline assembly would need to be modified for use with Native Client.
#if (defined(__ARM_NEON__) || defined(WEBP_ANDROID_NEON) || \
defined(__aarch64__)) && !defined(__native_client__)
defined(__aarch64__) || defined(WEBP_HAVE_NEON)) && \
!defined(__native_client__)
#define WEBP_USE_NEON
#endif