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/AliOS-Things-master/components/SDL2/src/libm/
A De_exp.c108 int32_t xsb; in __ieee754_exp() local
112 xsb = (hx>>31)&1; /* sign bit of x */ in __ieee754_exp()
122 else return (xsb==0)? x:0.0; /* exp(+-inf)={inf,0} */ in __ieee754_exp()
136 hi = x-ln2HI[xsb]; lo=ln2LO[xsb]; k = 1-xsb-xsb; in __ieee754_exp()
138 k = (int32_t) (invln2*x+halF[xsb]); in __ieee754_exp()

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