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12 Sep 2017 In this guide, we describe the basics of 32-bit x86 assembly language programming . X86 Addressing Mode Rule - Up to two of the 32-bit registers and a 32-bit 10 Feb 2010 A tutorial on programming with the x86-64 in Assembly 32-bit and 16-bit x86 architectures. x86–64 has 16 64-bit general purpose registers named R0 - R15. 16 Jan 2012 There are 8 32-bit registers: eax, ebx, ecx, edx, esi, edi, ebp, esp. There are 8 16-bit registers: ax, bx, cx, dx, si, di, bp, sp. There are 8 8-bit registers: ah, al, bh, bl, ch, cl, dh, dl. 7 Jan 2016 Note that my tutorial uses the AT&T assembly language syntax instead of Intel syntax An x86 CPU has eight 32-bit general-purpose registers. 25 May 2017 This tutorial will show you how to write assembly language programs on the x86-64 architecture. You will . The 16 integer registers are 64 bits wide and are called: Also see this nice little x86 floating-point slide deck from Ray Seyfarth.For example, movl %edx, %eax means Move the contents of the edx register into For the entire 32 bits you would use %eax (90% of the time this is what you Registers. Modern (i.e 386 and beyond) x86 processors have eight 32-bit general purpose registers, as depicted in Figure 1.