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LibM: Add 'isnormal'
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2 changed files with 12 additions and 0 deletions
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@ -536,4 +536,11 @@ double erfc(double x)
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{
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return 1 - erf(x);
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}
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int isnormal(double x)
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{
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if (x < 0)
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x = -x;
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return x >= DOUBLE_MIN && x <= DOUBLE_MAX;
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}
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}
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@ -42,6 +42,9 @@ __BEGIN_DECLS
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#define M_SQRT2 1.4142135623730951
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#define M_SQRT1_2 0.7071067811865475
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#define DOUBLE_MAX ((double)0b0111111111101111111111111111111111111111111111111111111111111111)
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#define DOUBLE_MIN ((double)0b0000000000010000000000000000000000000000000000000000000000000000)
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double acos(double);
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float acosf(float);
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double asin(double);
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@ -110,4 +113,6 @@ double hypot(double, double);
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double erf(double);
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double erfc(double);
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int isnormal(double);
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__END_DECLS
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