third_party/zlib/README.chromium - Issue 552123005: Integrate SIMD optimisations for zlib

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Unified Diff: third_party/zlib/README.chromium

Issue 552123005: Integrate SIMD optimisations for zlib (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Fix crc_fold_copy to work with inputs where len % 16 > 0 Created 6 years, 2 months ago

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Index: third_party/zlib/README.chromium

diff --git a/third_party/zlib/README.chromium b/third_party/zlib/README.chromium

index c9e06bae394c4334af5ac0874a6f2ebd467271e4..b90bcff42fb7d37bb8bad52239901523a7e1775a 100644

--- a/third_party/zlib/README.chromium

+++ b/third_party/zlib/README.chromium

@@ -19,3 +19,19 @@ The 'google.patch' file represents our changes from the original zlib-1.2.5.

A more significant change to support mixed-source data compression. See

crbug.com/139744 and mixed-source.patch.

+Integrated Intel SIMD optimisations from: https://github.com/jtkukunas/zlib/

+and modified to accomodate the older version and existing changes in tree.

+This introduces new files: simd_stub.c, crc_folding.c, fill_window_sse.c and

+x86.[ch]. All but the latter are built into a static library to allow the

+compiler to use the desired instructions only when valid. The latter version is

+only built on x86 (32-bit and 64-bit) systems with it's functionality stubbed

+on the others.

+Other changes to accomodate:

+- fill_window() implementation calls into _sse() variant when supported and the

+ original implementation renamed to _c()

+- read_buf was moved from local to ZLIB_INTERNAL for fill_window_sse.c to use

+- INSERT_STRING macro was made a function, insert_string() and an implementation using CRC instruction added

+- some crc funcionality moved into crc32.c