Adjust performance claims

Document the latest benchmarks on the Nexus 5X and change the "2-4x"
overall claim to "2-6x".  The peak performance on x86 platforms was
already closer to 5x, and the addition of SIMD-accelerated Huffman
encoding gave it that extra push over the cliff.

ChangeLog.txt

@@ -69,21 +69,28 @@ setting the JSIMD_NOHUFFENC environment variable to 1.
 
 [13] Added SIMD acceleration for Huffman encoding on NEON-capable ARM 32-bit
 platforms.  This speeds up the compression of full-color JPEGs by about 30% on
-average.  For the purposes of benchmarking or regression testing,
+average on a Cortex-A9 core (iPhone 4S) and by about 6-7% on average on
-SIMD-accelerated Huffman encoding can be disabled by setting the
+Cortex-A53 and Cortex-A57 cores.  For the purposes of benchmarking or
-JSIMD_NOHUFFENC environment variable to 1.
+regression testing, SIMD-accelerated Huffman encoding can be disabled by
+setting the JSIMD_NOHUFFENC environment variable to 1.
 
 [14] 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 overall 64-bit compression performance by
+implementation.)  This speeds up the compression of full-color JPEGs by about
-about 2x on ARMv8 processors.
+75% on average on a Cavium ThunderX processor and by about 2-2.5x on average on
+Cortex-A53 and Cortex-A57 cores.
 
 [15] pkg-config (.pc) scripts are now included for both the libjpeg and
 TurboJPEG API libraries on Un*x systems.  Note that if a project's build system
 relies on these scripts, then it will not be possible to build that project
 with libjpeg or with a prior version of libjpeg-turbo.
 
+[16] Optimized the ARM 64-bit (ARMv8) NEON SIMD decompression routines to
+improve performance on CPUs with in-order pipelines.  This speeds up the
+decompression of full-color JPEGs by nearly 2x on average on a Cavium ThunderX
+processor and by about 15% on average on a Cortex-A53 core.
+
 
 1.4.2
 =====

README.md

@@ -4,7 +4,7 @@ Background
 libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2,
 NEON, AltiVec) to accelerate baseline JPEG compression and decompression on
 x86, x86-64, ARM, and PowerPC systems.  On such systems, libjpeg-turbo is
-generally 2-4x as fast as libjpeg, all else being equal.  On other types of
+generally 2-6x as fast as libjpeg, all else being equal.  On other types of
 systems, libjpeg-turbo can still outperform libjpeg by a significant amount, by
 virtue of its highly-optimized Huffman coding routines.  In many cases, the
 performance of libjpeg-turbo rivals that of proprietary high-speed JPEG codecs.

release/ReadMe.txt

@@ -1,4 +1,4 @@
-libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2, NEON, AltiVec) to accelerate baseline JPEG compression and decompression on x86, x86-64, ARM, and PowerPC systems.  On such systems, libjpeg-turbo is generally 2-4x as fast as libjpeg, all else being equal.  On other types of systems, libjpeg-turbo can still outperform libjpeg by a significant amount, by virtue of its highly-optimized Huffman coding routines.  In many cases, the performance of libjpeg-turbo rivals that of proprietary high-speed JPEG codecs.
+libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2, NEON, AltiVec) to accelerate baseline JPEG compression and decompression on x86, x86-64, ARM, and PowerPC systems.  On such systems, libjpeg-turbo is generally 2-6x as fast as libjpeg, all else being equal.  On other types of systems, libjpeg-turbo can still outperform libjpeg by a significant amount, by virtue of its highly-optimized Huffman coding routines.  In many cases, the performance of libjpeg-turbo rivals that of proprietary high-speed JPEG codecs.
 
 libjpeg-turbo implements both the traditional libjpeg API as well as the less powerful but more straightforward TurboJPEG API.  libjpeg-turbo also features colorspace extensions that allow it to compress from/decompress to 32-bit and big-endian pixel buffers (RGBX, XBGR, etc.), as well as a full-featured Java interface.
 

release/deb-control.tmpl

@@ -11,7 +11,7 @@ Description: A SIMD-accelerated JPEG codec that provides both the libjpeg and Tu
  libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2,
  NEON, AltiVec) to accelerate baseline JPEG compression and decompression on
  x86, x86-64, ARM, and PowerPC systems.  On such systems, libjpeg-turbo is
- generally 2-4x as fast as libjpeg, all else being equal.  On other types of
+ generally 2-6x as fast as libjpeg, all else being equal.  On other types of
  systems, libjpeg-turbo can still outperform libjpeg by a significant amount,
  by virtue of its highly-optimized Huffman coding routines.  In many cases, the
  performance of libjpeg-turbo rivals that of proprietary high-speed JPEG

release/libjpeg-turbo.spec.in

@@ -46,7 +46,7 @@ Provides: %{name} = %{version}-%{release}, @PACKAGE_NAME@ = %{version}-%{release
 libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2,
 NEON, AltiVec) to accelerate baseline JPEG compression and decompression on
 x86, x86-64, ARM, and PowerPC systems.  On such systems, libjpeg-turbo is
-generally 2-4x as fast as libjpeg, all else being equal.  On other types of
+generally 2-6x as fast as libjpeg, all else being equal.  On other types of
 systems, libjpeg-turbo can still outperform libjpeg by a significant amount, by
 virtue of its highly-optimized Huffman coding routines.  In many cases, the
 performance of libjpeg-turbo rivals that of proprietary high-speed JPEG codecs.