[Buildroot] [PATCH 4/4] jpeg-turbo: add simd support for aarch64

Peter Korsgaard peter at korsgaard.com
Sun Dec 11 15:52:19 UTC 2016


>From the 1.5-b1 release notes:

Added ARM 64-bit (ARMv8) NEON SIMD implementations of the commonly-used
compression algorithms (including the slow integer forward DCT and h2v2 &
h2v1 downsampling algorithms, which are not accelerated in the 32-bit NEON
implementation.) This speeds up the compression of full-color JPEGs by about
75% on average on a Cavium ThunderX processor and by about 2-2.5x on average
on Cortex-A53 and Cortex-A57 cores.

Add it unconditionally for all aarch64 cores, as neon support is required
for all "standard" ARMv8 implementations.  If an ARMv8 implementation w/o
NEON ever shows up, then we will need to add a BR2_AARCH64_CPU_HAS_NEON and
handle it like ARM.

Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/jpeg/Config.in | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/package/jpeg/Config.in b/package/jpeg/Config.in
index 926f12e..9bf9712 100644
--- a/package/jpeg/Config.in
+++ b/package/jpeg/Config.in
@@ -7,7 +7,9 @@ config BR2_PACKAGE_JPEG
 config BR2_PACKAGE_JPEG_SIMD_SUPPORT
        bool
        default y if BR2_X86_CPU_HAS_MMX || BR2_ARM_CPU_HAS_NEON || \
-       	       	 BR2_POWERPC_CPU_HAS_ALTIVEC
+       	       	 BR2_POWERPC_CPU_HAS_ALTIVEC || \
+		 BR2_aarch64 || BR2_aarch64_be
+
 
 if BR2_PACKAGE_JPEG
 
-- 
2.10.2



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