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README.wasm: add instructions for enabling mulhi

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Change-Id: I1e9dd737f06ad76f73824352291a6e129ca5ded1
This commit is contained in:
James Zern 2017-11-02 11:20:09 -07:00
parent 88692490a5
commit 0d7614fddf
1 changed files with 7 additions and 0 deletions
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README.wasm
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@ -26,6 +26,13 @@ Building:
- Note this currently generates native executables only and is incompatible
with -DWEBP_BUILD_WEBP_JS.
Build options:
==============
- platform specific multiply high (mulhi) implementation, disabled by default.
arm: -DCMAKE_C_FLAGS='-DENABLE_NEON_BUILTIN_MULHI_INT16X8 ...'
x86: -DCMAKE_C_FLAGS='-DENABLE_X86_BUILTIN_MULHI_INT16X8 ...'
Cross compilation:
==================