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some code cleanup i have left in my folder :)

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@7560 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
Rodolfo Osvaldo Bogado
2011-05-25 18:14:29 +00:00
parent a9f7a0c284
commit 0e225a5ad1
4 changed files with 74 additions and 96 deletions
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141
Source/Core/Common/Src/MathUtil.cpp
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@ -31,100 +31,87 @@ static const u32 default_sse_state = _mm_getcsr();
namespace MathUtil
{
int ClassifyDouble(double dvalue)
u32 ClassifyDouble(double dvalue)
{
// TODO: Optimize the below to be as fast as possible.
IntDouble value;
value.d = dvalue;
// 5 bits (C, <, >, =, ?)
// easy cases first
if (value.i == 0) {
// positive zero
return 0x2;
} else if (value.i == 0x8000000000000000ULL) {
// negative zero
return 0x12;
} else if (value.i == 0x7FF0000000000000ULL) {
// positive inf
return 0x5;
} else if (value.i == 0xFFF0000000000000ULL) {
// negative inf
return 0x9;
} else {
// OK let's dissect this thing.
int sign = value.i >> 63;
int exp = (int)((value.i >> 52) & 0x7FF);
if (exp >= 1 && exp <= 2046) {
// Nice normalized number.
if (sign) {
return 0x8; // negative
} else {
return 0x4; // positive
u64 sign = value.i & DOUBLE_SIGN;
u64 exp = value.i & DOUBLE_EXP;
if (exp > DOUBLE_ZERO && exp < DOUBLE_EXP)
{
// Nice normalized number.
return sign ? PPC_FPCLASS_NN : PPC_FPCLASS_PN;
}
else
{
u64 mantissa = value.i & DOUBLE_FRAC;
if (mantissa)
{
if (exp)
{
return PPC_FPCLASS_QNAN;
}
else
{
// Denormalized number.
return sign ? PPC_FPCLASS_ND : PPC_FPCLASS_PD;
}
}
u64 mantissa = value.i & 0x000FFFFFFFFFFFFFULL;
if (exp == 0 && mantissa) {
// Denormalized number.
if (sign) {
return 0x18;
} else {
return 0x14;
}
} else if (exp == 0x7FF && mantissa /* && mantissa_top*/) {
return 0x11; // Quiet NAN
else if (exp)
{
//Infinite
return sign ? PPC_FPCLASS_NINF : PPC_FPCLASS_PINF;
}
else
{
//Zero
return sign ? PPC_FPCLASS_NZ : PPC_FPCLASS_PZ;
}
}
return 0x4;
}
int ClassifyFloat(float fvalue)
u32 ClassifyFloat(float fvalue)
{
// TODO: Optimize the below to be as fast as possible.
IntFloat value;
value.f = fvalue;
// 5 bits (C, <, >, =, ?)
// easy cases first
if (value.i == 0) {
// positive zero
return 0x2;
} else if (value.i == 0x80000000) {
// negative zero
return 0x12;
} else if (value.i == 0x7F800000) {
// positive inf
return 0x5;
} else if (value.i == 0xFF800000) {
// negative inf
return 0x9;
} else {
// OK let's dissect this thing.
int sign = value.i >> 31;
int exp = (int)((value.i >> 23) & 0xFF);
if (exp >= 1 && exp <= 254) {
// Nice normalized number.
if (sign) {
return 0x8; // negative
} else {
return 0x4; // positive
}
}
u64 mantissa = value.i & 0x007FFFFF;
if (exp == 0 && mantissa) {
// Denormalized number.
if (sign) {
return 0x18;
} else {
return 0x14;
}
} else if (exp == 0xFF && mantissa /* && mantissa_top*/) {
return 0x11; // Quiet NAN
}
u32 sign = value.i & FLOAT_SIGN;
u32 exp = value.i & FLOAT_EXP;
if (exp > FLOAT_ZERO && exp < FLOAT_EXP)
{
// Nice normalized number.
return sign ? PPC_FPCLASS_NN : PPC_FPCLASS_PN;
}
return 0x4;
else
{
u32 mantissa = value.i & FLOAT_FRAC;
if (mantissa)
{
if (exp)
{
return PPC_FPCLASS_QNAN; // Quiet NAN
}
else
{
// Denormalized number.
return sign ? PPC_FPCLASS_ND : PPC_FPCLASS_PD;
}
}
else if (exp)
{
// Infinite
return sign ? PPC_FPCLASS_NINF : PPC_FPCLASS_PINF;
}
else
{
//Zero
return sign ? PPC_FPCLASS_NZ : PPC_FPCLASS_PZ;
}
}
}
} // namespace
void LoadDefaultSSEState()