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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
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@ -22,9 +22,64 @@
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#include <cmath>
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namespace {
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static u32 saved_sse_state = _mm_getcsr();
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static const u32 default_sse_state = _mm_getcsr();
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}
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namespace MathUtil
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{
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int ClassifyFP(double dvalue)
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{
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// TODO: Optimize the below to be as fast as possible.
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IntDouble value;
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value.d = dvalue;
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// 5 bits (C, <, >, =, ?)
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// easy cases first
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if (value.i == 0) {
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// positive zero
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return 0x2;
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} else if (value.i == 0x8000000000000000ULL) {
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// negative zero
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return 0x12;
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} else if (value.i == 0x7FF0000000000000ULL) {
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// positive inf
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return 0x5;
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} else if (value.i == 0xFFF0000000000000ULL) {
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// negative inf
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return 0x9;
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} else {
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// OK let's dissect this thing.
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int sign = value.i >> 63;
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int exp = (int)((value.i >> 52) & 0x7FF);
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if (exp >= 1 && exp <= 2046) {
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// Nice normalized number.
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if (sign) {
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return 0x8; // negative
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} else {
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return 0x4; // positive
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}
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}
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u64 mantissa = value.i & 0x000FFFFFFFFFFFFFULL;
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if (exp == 0 && mantissa) {
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// Denormalized number.
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if (sign) {
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return 0x18;
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} else {
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return 0x14;
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}
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} else if (exp == 0x7FF && mantissa /* && mantissa_top*/) {
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return 0x11; // Quiet NAN
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}
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}
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return 0x4;
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}
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} // namespace
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void LoadDefaultSSEState()
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{
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@ -145,3 +200,4 @@ void Matrix44::Multiply(const Matrix44 &a, const Matrix44 &b, Matrix44 &result)
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{
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MatrixMul(4, a.data, b.data, result.data);
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}
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