Leaked source code of windows server 2003
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title pow2 - Danny's cheapo pow function;*** ;pow2.asm - compute 2 to the power of something;; Copyright (c) 1985-88, Microsoft Corporation;;Purpose:;;*******************************************************************************
.xlist include cruntime.inc.list
CODESEG
pow2 proto stdcall, orig:qword
public pow2pow2 proc stdcall, orig:qword
fld orig fst st(1) ; duplicate orig frndint ; I don't care how it rounds fstp st(2) ; st=orig st(1)=round fsub st, st(1) ; st=orig-round f2xm1 ; st=2^(orig-round)-1 fld1 faddp st(1), st ; st=2^(orig-round) fscale ; st=2^(orig-round)*2^round=2^orig fstp st(1) ; clean stack of st(1) retpow2 endp end
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