shithub: libvpx

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android: clarify RTCD usage

Note that when using --disable-runtime-cpu-detect the developer
must keep in mind what devices the library will be run on.

BUG=webm:1623

Change-Id: I0359e226bb678f8e5145bb30cd1cefc7e30c6c79

--- a/build/make/Android.mk

+++ b/build/make/Android.mk

@@ -29,13 +29,15 @@

 # include $(CLEAR_VARS)

 # include jni/libvpx/build/make/Android.mk

 #

-# By default libvpx will detect at runtime the existance of NEON extension.

-# For this we import the 'cpufeatures' module from the NDK sources.

-# libvpx can also be configured without this runtime detection method.

-# Configuring with --disable-runtime-cpu-detect will assume presence of NEON.

-# Configuring with --disable-runtime-cpu-detect --disable-neon \

-#     --disable-neon-asm

-# will remove any NEON dependency.

+# By default libvpx will use the 'cpufeatures' module from the NDK. This allows

+# the library to be built with all available optimizations (SSE2->AVX512 for

+# x86, NEON for arm, DSPr2 for mips). This can be disabled with

+#   --disable-runtime-cpu-detect

+# but the resulting library *must* be run on devices supporting all of the

+# enabled extensions. They can be disabled individually with

+#   --disable-{sse2, sse3, ssse3, sse4_1, avx, avx2, avx512}

+#   --disable-neon[-asm]

+#   --disable-{dspr2, msa}

 #

 # Running ndk-build will build libvpx and include it in your project.