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Fix NaN payload unittest in errorfunction

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For some platforms, math on a NaN may change the sign.  This is
ok according to C99.  Replaced with test that ignores signbit.
This commit is contained in:
Dan Olson 2016-02-07 20:17:57 -08:00
parent fd10beb59c
commit b938a74628
1 changed files with 6 additions and 2 deletions
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8
std/internal/math/errorfunction.d
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@ -217,6 +217,10 @@ unittest {
enum real erf0_875 = (1-0.215911865234375) - 1.3073705765341685464282101150637224028267E-5;
static bool isNaNWithPayload(real x, ulong payload) @safe pure nothrow @nogc
{
return isNaN(x) && getNaNPayload(x) == payload;
}
assert(feqrel(erfc(0.250L), erfc0_250 )>=real.mant_dig-1);
assert(feqrel(erfc(0.375L), erfc0_375 )>=real.mant_dig-0);
@ -234,8 +238,8 @@ unittest {
assert(isIdentical(erf(-0.0),-0.0));
assert(erf(real.infinity) == 1.0);
assert(erf(-real.infinity) == -1.0);
assert(isIdentical(erf(NaN(0xDEF)),NaN(0xDEF)));
assert(isIdentical(erfc(NaN(0xDEF)),NaN(0xDEF)));
assert(isNaNWithPayload(erf(NaN(0xDEF)), 0xDEF));
assert(isNaNWithPayload(erfc(NaN(0xDEF)), 0xDEF));
assert(isIdentical(erfc(real.infinity),0.0));
assert(erfc(-real.infinity) == 2.0);
assert(erfc(0) == 1.0);