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VideoCommon: Explicitly disable fp_contract for CPUCull

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This commit is contained in:
TellowKrinkle 2022-11-13 23:26:09 -06:00
parent 1be0149146
commit a0e6d7c173
1 changed files with 14 additions and 0 deletions
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14
Source/Core/VideoCommon/CPUCull.cpp
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@ -15,6 +15,20 @@
#include "VideoCommon/VideoConfig.h"
#include "VideoCommon/XFMemory.h"
// We really want things like c.w * a.x - a.w * c.x to stay symmetric, so they cancel to zero on
// degenerate triangles. Make sure the compiler doesn't optimize in fmas where not requested.
#ifdef _MSC_VER
#pragma fp_contract(off)
#else
// GCC doesn't support any in-file way to turn off fp contract yet
// Not ideal, but worst case scenario its cpu cull is worse at detecting degenerate triangles
// (Most likely to happen on arm, as we don't compile the cull code for x86 fma)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunknown-pragmas"
#pragma STDC FP_CONTRACT OFF
#pragma GCC diagnostic pop
#endif
#if defined(_M_X86) || defined(_M_X86_64)
#define USE_SSE
#elif defined(_M_ARM_64)