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(at least for GNUC platforms) don't rely on nasty division-by-zero tricks to generate +-inf and nan. instead borrow the bitlevel twiddling javascript uses. I would imagine that this would work for all platforms that use IEEE floats (which is necessarily all platforms for which EF will work), but someone else needs to figure out if windows will work with this code.

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toshok%hungry.com 1998-12-16 01:38:18 +00:00
parent 165f9e859f
commit 4182e3c193
1 changed files with 23 additions and 15 deletions
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38
ef/Utilities/General/FloatUtils.cpp
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@ -79,29 +79,37 @@ union dpun {
Flt64 d;
};
union spun {
uint32 s;
Flt32 f;
};
struct DummyInit
{
DummyInit() {
union dpun u;
union dpun du;
union spun su;
#if notyet
floatPositiveInfinity = 1.0f/fZero;
floatNegativeInfinity = -1.0f/fZero;
floatNaN = fZero/fZero;
#endif
su.s = 0x7f800000;
floatPositiveInfinity = su.f;
u.s.hi = DOUBLE_HI32_EXPMASK;
u.s.lo = 0x00000000;
doublePositiveInfinity = u.d;
du.s.hi = DOUBLE_HI32_EXPMASK;
du.s.lo = 0x00000000;
doublePositiveInfinity = du.d;
su.s = 0xff800000;
floatNegativeInfinity = su.f;
u.s.hi = DOUBLE_HI32_SIGNBIT | DOUBLE_HI32_EXPMASK;
u.s.lo = 0x00000000;
doubleNegativeInfinity = u.d;
du.s.hi = DOUBLE_HI32_SIGNBIT | DOUBLE_HI32_EXPMASK;
du.s.lo = 0x00000000;
doubleNegativeInfinity = du.d;
su.s = 0x7f900000;
floatNaN = su.f;
u.s.hi = DOUBLE_HI32_EXPMASK | DOUBLE_HI32_MANTMASK;
u.s.lo = 0xffffffff;
doubleNaN = u.d;
du.s.hi = DOUBLE_HI32_EXPMASK | DOUBLE_HI32_MANTMASK;
du.s.lo = 0xffffffff;
doubleNaN = du.d;
}
};