Unbreak the build (sorry, forgot a few includes), move FP classification to MathUtil, add some more unittests.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3442 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
hrydgard
2009-06-14 11:30:33 +00:00
parent f67660cbfe
commit 0bee242493
8 changed files with 138 additions and 87 deletions

View File

@ -22,9 +22,64 @@
#include <cmath>
namespace {
static u32 saved_sse_state = _mm_getcsr();
static const u32 default_sse_state = _mm_getcsr();
}
namespace MathUtil
{
int ClassifyFP(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 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
}
}
return 0x4;
}
} // namespace
void LoadDefaultSSEState()
{
@ -145,3 +200,4 @@ void Matrix44::Multiply(const Matrix44 &a, const Matrix44 &b, Matrix44 &result)
{
MatrixMul(4, a.data, b.data, result.data);
}