Bsf instruction

Bsf instruction

Download Bsf instruction




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Date added: 23.03.2015
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Jul 12, 2011 - The x86-64 validator allows the following instruction sequence: bsf %ebx, %eax mov %rdx, (%r15, %rax) This is unsafe because this BSF

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Documentation Home > IA-32 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Bit Instructions > Bit Scan Forward (bsf). x86 Instruction Set Reference. BSF. Bit Scan Forward. Opcode, Mnemonic, Description. 0F BC, BSF r16, r/m16, Bit scan forward on r/m16. 0F BC, BSF r32, r/m32 BSF - Bit Scan Forward (386+) Usage: BSF dest,src Modifies flags: ZF Scans source operand for first bit set. Sets ZF if a bit is found set and loads the destination

Jump to Bit Scanning: BSF and BSR - The bsf (Bit Scan Forward) and bsr (Bit Scan Reverse) instructions search for the first or last set bit in a 16 or 32 bit BSF. From Wikipedia, the free encyclopedia. Jump to: navigation, search Taiwan's Time signal; The Bit Scan Forward x86 instruction, used to compute find first Opcode Instruction Clocks Description 0F BC BSF r16,r/m16 10+3n Bit scan forward on r/m word 0F BC BSF r32,r/m32 10+3n Bit scan forward on r/m dwordPrev, Appendix B. Intel x86 Instruction Reference, Next. B.10 BSF, BSR: Bit Scan. BSF reg16,r/m16 ; o16 0F BC /r [386] BSF reg32,r/m32 ; o32 0F BC /r [386] However, the downside is that you can't do very much with one instruction. Here is a . These instructions clear (BCF) or set (BSF) the indicated bit in a register. Opcode, Instruction, Clocks, Description, Example. 0F BC, bsfw r/m16,r16, 10+3n, Bit scan forward on r/m word, bsfw %cx,%bx bsfw (%ebx,1),%bx bsfw (%ebx,2)

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