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ChangeLog.md: clarification regarding AVX2

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2018-03-22 15:56:09 -05:00
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ChangeLog.md
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@@ -6,11 +6,12 @@
1. Added AVX2 SIMD implementations of the colorspace conversion, chroma
downsampling and upsampling, integer quantization and sample conversion, and
slow integer DCT/IDCT algorithms. When using the slow integer DCT/IDCT
algorithms, the compression of RGB images is approximately 13-36% (avg. 22%)
faster (relative to libjpeg-turbo 1.5.x) with 64-bit code and 11-21% (avg. 17%)
faster with 32-bit code, and the decompression of RGB images is approximately
9-35% (avg. 17%) faster with 64-bit code and 7-17% (avg. 12%) faster with
32-bit code. (As tested on a 3 GHz Intel Core i7. Actual mileage may vary.)
algorithms on AVX2-equipped CPUs, the compression of RGB images is
approximately 13-36% (avg. 22%) faster (relative to libjpeg-turbo 1.5.x) with
64-bit code and 11-21% (avg. 17%) faster with 32-bit code, and the
decompression of RGB images is approximately 9-35% (avg. 17%) faster with
64-bit code and 7-17% (avg. 12%) faster with 32-bit code. (As tested on a
3 GHz Intel Core i7. Actual mileage may vary.)
2. Overhauled the build system to use CMake on all platforms, and removed the
autotools-based build system. This decision resulted from extensive