The-Homebrew-Cloud/dolphin
2
0
Fork 0
mirror of https://github.com/dolphin-emu/dolphin.git synced 2025-02-09 06:03:32 +01:00
Code Issues Packages Projects Releases Wiki Activity

x64FPURoundMode: always set x87 precision

Browse Source 
Set the x87 precision, even on x64. Since we are using x87 instructions
in the JIT now, we can't guarantee that x87 precision will never
influence Dolphin on x64.
This commit is contained in:
Tillmann Karras 2014-04-02 01:49:56 +02:00
parent ed762a3eda
commit 9de77b7c23
1 changed files with 4 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
Source/Core/Common/x64FPURoundMode.cpp
View File

@ -34,10 +34,6 @@ namespace FPURoundMode
void SetPrecisionMode(PrecisionMode mode)
{
#ifdef _M_X86_32
// sets the floating-point lib to 53-bit
// PowerPC has a 53bit floating pipeline only
// eg: sscanf is very sensitive
#ifdef _WIN32
_control87(_PC_53, MCW_PC);
#else
@ -47,14 +43,10 @@ namespace FPURoundMode
2 << 8, // 53 bits
3 << 8, // 64 bits
};
unsigned short _mode;
asm ("fstcw %0" : "=m" (_mode));
_mode = (_mode & ~PRECISION_MASK) | precision_table[mode];
asm ("fldcw %0" : : "m" (_mode));
#endif
#else
//x64 doesn't need this - fpu is done with SSE
//but still - set any useful sse options here
unsigned short cw;
asm ("fnstcw %0" : "=m" (cw));
cw = (cw & ~PRECISION_MASK) | precision_table[mode];
asm ("fldcw %0" : : "m" (cw));
#endif
}