Tillmann Karras db196d8c5b Jit64[IL]: fix float conversions ... Floating-point is complicated... Some background: Denormals are floats that are too close to zero to be stored in a normalized way (their exponent would need more bits). Since they are stored unnormalized, they are hard to work with, even in hardware. That's why both PowerPC and SSE can be configured to operate in faster but non-standard-conpliant modes in which these numbers are simply rounded ('flushed') to zero. Internally, we do the same as the PowerPC CPU and store all floats in double format. This means that for loading and storing singles we need a conversion. The PowerPC CPU does this in hardware. We previously did this using CVTSS2SD/CVTSD2SS. Unfortunately, these instructions are considered arithmetic and therefore flush denormals to zero if non-IEEE mode is active. This normally wouldn't be a problem since the next arithmetic floating-point instruction would do the same anyway but as it turns out some games actually use floating-point instructions for copying arbitrary data. My idea for fixing this problem was to use x87 instructions since the x87 FPU never supported flush-to-zero and thus doesn't mangle denormals. However, there is one more problem to deal with: SNaNs are automatically converted to QNaNs (by setting the most-significant bit of the fraction). I opted to fix this by manually resetting the QNaN bit of all values with all-1s exponent.		2014-02-12 23:12:15 +01:00
..
Interpreter	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
Jit64	Jit64[IL]: fix float conversions	2014-02-12 23:12:15 +01:00
Jit64IL	Jit64[IL]: fix float conversions	2014-02-12 23:12:15 +01:00
JitArm32	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
JitArmIL	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
JitCommon	Jit64[IL]: fix float conversions	2014-02-12 23:12:15 +01:00
JitILCommon	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
CPUCoreBase.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
GDBStub.cpp
GDBStub.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
Gekko.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
JitInterface.cpp
JitInterface.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
LUT_frsqrtex.cpp
LUT_frsqrtex.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
PowerPC.cpp
PowerPC.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
PPCAnalyst.cpp
PPCAnalyst.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
PPCCache.cpp
PPCCache.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
PPCSymbolDB.cpp
PPCSymbolDB.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
PPCTables.cpp	Fix warnings found by StringFromFormat having printf style checking.	2014-02-07 01:38:08 +13:00
PPCTables.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
Profiler.cpp
Profiler.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00
SignatureDB.cpp
SignatureDB.h	Replace all include guard ifdefs with "#pragma once"	2014-02-10 18:07:16 -05:00