x86移位SHL、SHR、SAL、ROL、RCR等指令原创

由 KR Irvine 著作 · 被引用 111 次 — The SHL (shift left) instruction performs a logical left shift on the destination operand, filling the lowest bit with 0. CF. 0. • Operand types: SHL reg,imm8.

2023年10月30日 — Checking the SHL x86 assembly instruction for overflow · Unfortunately the carry is only useful for single bit shifts. · neg cl / shr reg,cl ...

SAL/SAR/SHL/SHR — Shift. Opcode1. Instruction, Op/En, 64-Bit Mode, Compat/Leg Mode, Description.

x86 Instruction Set Reference. SAL/SAR/SHL/SHR. Shift. Opcode, Mnemonic, Description. D0 /4, SAL r/m8, Multiply r/m8 by 2, 1 time. D2 /4, SAL r/m8,CL, Multiply ...

sal (or its synonym shl ) left shifts (multiplies) a byte, word, or long value for a count specified by an immediate value and stores the product in that byte, ...

2014年6月3日 — SHL is like << in C, it shifts the bits left. · so, how I understand it is: first I move the content of EBP-0x4 in eax. · This is the basic code ...

若未找到, 则置ZF否则清0. 移位 X, Y ; 将X左或右移Y位, shl,sal左移, shl同sal, shr,sar右移, Y为立即数或CL暂存器. shl al, cl ; 将al左移cl位, al右空位补 ...

2020年2月10日 — Description. The shl or sal instruction is used to shift the bits of the operand destination to the left, by the number of bits specified in ...

2022年7月3日 — SHL 指令用于实现左移位运算，SAL 指令用于实现算术左移位运算，SHR 指令用于实现右移位运算，SAR 指令用于实现算术右移位运算。 ROL 指令用于实现左旋转 ...