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Disable broken idSIMD_SSE::UpSampleOGGTo44kHz()

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It corrupted the stack when called with buffers allocated on the stack
and numSamples that are not a multiple of four, apparently, by writing
4 floats too many, at least in the 22KHz Stereo case..

This caused the crash described in
  https://github.com/dhewm/dhewm3/issues/303#issuecomment-678809662

Now it just uses the generic C code, like all platforms besides MSVC/x86
already do.
This commit is contained in:
Daniel Gibson 2020-09-06 04:54:51 +02:00
parent 335858bd5a
commit 66f11624fe
2 changed files with 7 additions and 1 deletions
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5
idlib/math/Simd_SSE.cpp
View file

@ -17164,6 +17164,10 @@ void idSIMD_SSE::UpSamplePCMTo44kHz( float *dest, const short *src, const int nu
}
}
// DG: at least in the 22KHz Stereo OGG case with numSamples % 4 != 0 this is broken (writes 4 floats too much which can destroy the stack, see #303),
// so let's just not use it anymore its MSVC+32bit only anyway and I doubt it gets noticeable speedups, so I don't feel like trying to understand and fix it..
#if 0
/*
============
SSE_UpSample11kHzMonoOGGTo44kHz
@ -17474,6 +17478,7 @@ void idSIMD_SSE::UpSampleOGGTo44kHz( float *dest, const float * const *ogg, cons
assert( 0 );
}
}
#endif // 0 (DG: commenting out all the OGG-related SSE code)
/*
============

3
idlib/math/Simd_SSE.h
View file

@ -135,7 +135,8 @@ public:
virtual int VPCALL CreateVertexProgramShadowCache( idVec4 *vertexCache, const idDrawVert *verts, const int numVerts );
virtual void VPCALL UpSamplePCMTo44kHz( float *dest, const short *pcm, const int numSamples, const int kHz, const int numChannels );
virtual void VPCALL UpSampleOGGTo44kHz( float *dest, const float * const *ogg, const int numSamples, const int kHz, const int numChannels );
// DG: the following is broken at least in the 22KHz Stereo case with numSamples % 4 != 0 (writes 4 floats too much which can destroy the stack), so let's not use it anymore.
//virtual void VPCALL UpSampleOGGTo44kHz( float *dest, const float * const *ogg, const int numSamples, const int kHz, const int numChannels );
virtual void VPCALL MixSoundTwoSpeakerMono( float *mixBuffer, const float *samples, const int numSamples, const float lastV[2], const float currentV[2] );
virtual void VPCALL MixSoundTwoSpeakerStereo( float *mixBuffer, const float *samples, const int numSamples, const float lastV[2], const float currentV[2] );
virtual void VPCALL MixSoundSixSpeakerMono( float *mixBuffer, const float *samples, const int numSamples, const float lastV[6], const float currentV[6] );