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Implemented FPU rounding control for 32-bit non-Windows platforms. I renamed the _RC_* constants that were previously #defined, because the bit patterns used by the hardware do not match those used by Windows; the new constants match the hardware.

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@271 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
Maarten ter Huurne 2008-08-22 12:17:55 +00:00
parent 954ea6956b
commit 292120453e
1 changed files with 23 additions and 8 deletions
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31
Source/Core/Core/Src/PowerPC/Interpreter/Interpreter_SystemRegisters.cpp
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@ -18,11 +18,12 @@
#include <float.h>
#ifdef _WIN32
#include <intrin.h>
#else
#define _RC_NEAR (0<<10)
#define _RC_DOWN (1<<10)
#define _RC_UP (2<<10)
#define _RC_CHOP (3<<10)
#else
static const unsigned short FPU_ROUND_NEAR = 0 << 10;
static const unsigned short FPU_ROUND_DOWN = 1 << 10;
static const unsigned short FPU_ROUND_UP = 2 << 10;
static const unsigned short FPU_ROUND_CHOP = 3 << 10;
static const unsigned short FPU_ROUND_MASK = 3 << 10;
#include <xmmintrin.h>
#endif
@ -73,15 +74,29 @@ void UpdateFPSCR(UReg_FPSCR fp)
// Set FPU rounding mode to mimic the PowerPC's
int round = fp.RN;
#ifdef _M_IX86
// This shouldn't really be needed anymore since we use SSE
#ifdef _WIN32
const int table[4] =
{
_RC_NEAR,
_RC_CHOP,
_RC_UP,
_RC_DOWN
};
// This shouldn't really be needed anymore since we use SSE
_set_controlfp(_MCW_RC, table[round]);
};
_set_controlfp(_MCW_RC, table[round]);
#else
const unsigned short table[4] =
{
FPU_ROUND_NEAR,
FPU_ROUND_CHOP,
FPU_ROUND_UP,
FPU_ROUND_DOWN
};
unsigned short mode;
asm ("fstcw %0" : : "m" (mode));
mode = (mode & ~FPU_ROUND_MASK) | table[round];
asm ("fldcw %0" : : "m" (mode));
#endif
#endif
// Also corresponding SSE rounding mode setting
UpdateSSEState(round, fp.NI ? true : false);