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Work around Google's trash NDK

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This commit is contained in:
Ryan Houdek 2015-12-22 18:20:17 -06:00
parent ce6de78854
commit eaf21b3c80
1 changed files with 10 additions and 4 deletions
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14
Source/Core/Common/MathUtil.cpp
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@ -196,6 +196,12 @@ const int fres_expected_dec[] =
// Used by fres and ps_res.
double ApproximateReciprocal(double val)
{
// We are using namespace std scoped here because the Android NDK is complete trash as usual
// For 32bit targets(mips, ARMv7, x86) it doesn't provide an implementation of std::copysign
// but instead provides just global namespace copysign implementations.
// The workaround for this is to just use namespace std within this function's scope
// That way on real toolchains it will use the std:: variant like normal.
using namespace std;
union
{
double valf;
@ -209,23 +215,23 @@ double ApproximateReciprocal(double val)
// Special case 0
if (mantissa == 0 && exponent == 0)
return std::copysign(std::numeric_limits<double>::infinity(), valf);
return copysign(std::numeric_limits<double>::infinity(), valf);
// Special case NaN-ish numbers
if (exponent == (0x7FFLL << 52))
{
if (mantissa == 0)
return std::copysign(0.0, valf);
return copysign(0.0, valf);
return 0.0 + valf;
}
// Special case small inputs
if (exponent < (895LL << 52))
return std::copysign(std::numeric_limits<float>::max(), valf);
return copysign(std::numeric_limits<float>::max(), valf);
// Special case large inputs
if (exponent >= (1149LL << 52))
return std::copysign(0.0, valf);
return copysign(0.0, valf);
exponent = (0x7FDLL << 52) - exponent;