Add SSE2/SSE41 implementations for mct.c

[gcode-importer]

Originally reported on Google Code with ID 451

SSE2 implementations for opj_mct_encode/opj_mct_decode (not all compilers do automatic
vectorization). It's a as fast as automatic vectorization code from Xcode 6.1.1 clang
on both x86 & x64. This will be enabled by default when compiler defines __SSE2__ using
static dispatching (this will be the only code path). All x64 builds (except Visual
Studio) & x86 builds on MacOs.

SSE41 implementation for opj_mct_encode_real still using static dispatching (__SSE4_1__).
1.4x faster on x64, 3.0x faster on x86. This won't be enabled by default on any builds.

To get those to be available on all builds, Issue 450 needs to be resolved.

Reported by mayeut on 2014-12-13 12:23:29

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- _Attachment: [issue451.patch](https://storage.googleapis.com/google-code-attachments/openjpeg/issue-451/comment-0/issue451.patch)_

[gcode-importer]

This issue was closed by revision r2957.

Reported by mayeut on 2014-12-13 12:29:30

• Status changed: Fixed