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Core: Make sure precision is correct for COP1_D_SQRT

This commit is contained in:
zilmar 2023-10-13 00:16:14 +10:30
parent 3a68d3d92a
commit 00c5057b17
1 changed files with 18 additions and 1 deletions
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19
Source/Project64-core/N64System/Interpreter/InterpreterOps.cpp
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@ -2519,8 +2519,22 @@ void R4300iOp::COP1_D_DIV()
*_FPR_UDW[m_Opcode.fd] = *(uint64_t *)&Result; *_FPR_UDW[m_Opcode.fd] = *(uint64_t *)&Result;
} }
#if defined(__i386__) || defined(_M_IX86)
static double correct_sqrt(double a)
{
__asm
{
fld QWORD PTR [a]
fsqrt
}
}
#endif
void R4300iOp::COP1_D_SQRT() void R4300iOp::COP1_D_SQRT()
{ {
#if defined(__i386__) || defined(_M_IX86)
_controlfp(_PC_53, _MCW_PC);
#endif
if (InitFpuOperation(((FPStatusReg &)_FPCR[31]).RoundingMode)) if (InitFpuOperation(((FPStatusReg &)_FPCR[31]).RoundingMode))
{ {
return; return;
@ -2530,7 +2544,11 @@ void R4300iOp::COP1_D_SQRT()
{ {
return; return;
} }
#if defined(__i386__) || defined(_M_IX86)
double Result = (double)correct_sqrt(*(double *)_FPR_D[m_Opcode.fs]);
#else
double Result = (double)sqrt(*(double *)_FPR_D[m_Opcode.fs]); double Result = (double)sqrt(*(double *)_FPR_D[m_Opcode.fs]);
#endif
if (CheckFPUResult64(Result)) if (CheckFPUResult64(Result))
{ {
return; return;
@ -3345,7 +3363,6 @@ bool R4300iOp::InitFpuOperation(FPRoundingMode RoundingModel)
case FPRoundingMode_RoundTowardPlusInfinity: fesetround(FE_UPWARD); break; case FPRoundingMode_RoundTowardPlusInfinity: fesetround(FE_UPWARD); break;
case FPRoundingMode_RoundTowardMinusInfinity: fesetround(FE_DOWNWARD); break; case FPRoundingMode_RoundTowardMinusInfinity: fesetround(FE_DOWNWARD); break;
} }
fesetround(RoundingModel);
feclearexcept(FE_ALL_EXCEPT); feclearexcept(FE_ALL_EXCEPT);
return false; return false;
} }