CrossWorks for ARM User Guide

If x = +Infinity and y < 0 and y NaN, powf returns +0.If x = -Infinity, powf returns powf(-0, y)If x < 0 and x Infinity and y is a non-integer, powf returns NaN.Portabilitypowf conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).scalbnSynopsisDescriptionFast math librarybehaviorIEC 60559 mathlibrary behaviorPortability#include double scalbn(double x, int exp);scalbn multiplies a floating-point number by an integral power of FLT_RADIX.As floating-point aritmetic conforms to IEC 60559, FLT_RADIX is 2 and scalbn is (inthis implementation) identical to ldexp.scalbn returns x * FLT_RADIX^exp.If the result overflows, errno is set to ERANGE and scalbn returns HUGE_VAL.If x is Infinity or NaN, scalbn returns x.If the result overflows, scalbn returns Infinity.scalbn conforms to ISO/IEC 9899:1999 (C99).See Also ldexp (page 268)scalbnfSynopsisDescriptionFast math librarybehaviorIEC 60559 mathlibrary behaviorPortability#include float scalbnf(float x, int exp);scalbnf multiplies a floating-point number by an integral power of FLT_RADIX.As floating-point aritmetic conforms to IEC 60559, FLT_RADIX is 2 and scalbnf is (inthis implementation) identical to ldexpf.scalbnf returns x * FLT_RADIX^exp.If the result overflows, errno (page 247) is set to ERANGE and scalbnf returnsHUGE_VALF.If x is Infinity or NaN, scalbnf returns x.If the result overflows, scalbnf returns Infinity.scalbnf conforms to ISO/IEC 9899:1999 (C99).See Also ldexpf (page 268)272 Chapter 28 Standard C Library Reference