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docs: add SSE3 and SSE4 dot product options

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Recep Aslantas
2019-02-13 10:13:06 +03:00
parent 2b1eece9ac
commit 0d2e5a996a
1 changed files with 10 additions and 0 deletions
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docs/source/opt.rst
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@@ -40,3 +40,13 @@ SSE and SSE2 Shuffle Option
**_mm_shuffle_ps** generates **shufps** instruction even if registers are same.
You can force it to generate **pshufd** instruction by defining
**CGLM_USE_INT_DOMAIN** macro. As default it is not defined.
SSE3 and SSE4 Dot Product Options
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You have to extra options for dot product: **CGLM_SSE4_DOT** and **CGLM_SSE3_DOT**.
- If **SSE4** is enabled then you can define **CGLM_SSE4_DOT** to force cglm to use **_mm_dp_ps** instruction.
- If **SSE3** is enabled then you can define **CGLM_SSE3_DOT** to force cglm to use **_mm_hadd_ps** instructions.
otherwise cglm will use custom cglm's hadd functions which are optimized too.