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use MA_ASSUME for channel counts before loops

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The range of the value isn't obvious to any compiler, as it could go for
one iteration or 4 billion iterations. Adding MA_ASSUME in these places
helps the compiler understand the range of possible values, and know how
heavily to vectorize (or not vectorize) these loops.

Signed-off-by: Steven Noonan <steven@uplinklabs.net>
This commit is contained in:
Steven Noonan
2021-03-15 04:04:26 -07:00
parent c1451b30a4
commit 8a1858eba6
2 changed files with 14 additions and 0 deletions
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research/miniaudio_engine.h
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@@ -9323,6 +9323,9 @@ MA_API ma_result ma_spatializer_process_pcm_frames(ma_spatializer* pSpatializer,
const ma_uint32 channelsOut = pSpatializer->config.channelsOut;
const ma_uint32 channelsIn = pSpatializer->config.channelsIn;
MA_ASSUME(channelsOut >= MA_MIN_CHANNELS && channelsOut <= MA_MAX_CHANNELS);
MA_ASSUME(channelsIn >= MA_MIN_CHANNELS && channelsIn <= MA_MAX_CHANNELS);
/*
We'll need the listener velocity for doppler pitch calculations. The speed of sound is
defined by the listener, so we'll grab that here too.