September 2017
Beginner to intermediate
290 pages
6h 58m
English
Content preview from Mastering Assembly Programming
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Factorials
We also make use of factorials as we divide exponentiated values by a factorial of exponents thereof. The factorial of a given number n is the product of all positive integers less than or equal to the given number n:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; Simple calculation of factorial; Parameter is in ECX (number to calculate the factorial of); Return value is in XMM0 register;-----------------------------------------------------fact: push ebp mov ebp, esp sub esp, 16 * 3 push ecx movups [ebp - 16], xmm1 movups [ebp - 16 * 2], xmm2 mov dword[ebp - 16 * 3], 1.0 movd xmm2, [ebp - 16 * 3] movlhps xmm2, xmm2 movsldup xmm2, xmm2 movaps xmm0, xmm2 movaps xmm1, xmm2.l1: mulps xmm0, xmm1 addps xmm1, xmm2 loop .l1
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