Shift (sal, shl, sar, shr) (IA-32 Assembly Language Reference . . . - Oracle shr right shifts (unsigned divides) a byte, word, or long value for a count specified by an immediate value and stores the quotient in that byte, word, or long respectively The second variation divides by a count value specified in the CL register shr sets the high-order bit to 0
Machine Level – Assembly (x86-64) basics - New York University Sets the lower byte of dest based on combinations of condition codes and does not alter remaining 7 bytes Destination can also be memory location These instructions are usually used after a comparison cmpq %rsi, %rdi setg %al movzbq %al, %rax # Compare x:y # Set when > # Zero rest of %rax ret
CS356: A short guide to x86-64 assembly - HackMD I'll try to improve this guide over time The goal is to collect the essential knowledge about x86-64 assembly and examples of very common patterns (if, while, for, procedure calls) in BombLab We have plenty of registers inside the CPU; they can store 8 bytes each and they are called:
SAL SAR SHL SHR — Shift - felixcloutier. com Multiply r m8 by 2, CL times Multiply r m8 by 2, imm8 times Multiply r m16 by 2, once Multiply r m16 by 2, CL times Multiply r m16 by 2, imm8 times Multiply r m32 by 2, once Multiply r m64 by 2, once Multiply r m32 by 2, CL times Multiply r m64 by 2, CL times Multiply r m32 by 2, imm8 times Multiply r m64 by 2, imm8 times
CS 107 Lecture 11: Assembly Part II - Stanford University It has the form of an instruction that reads from memory to a register, but it does not reference memory at all It's first operand appears to be a memory reference, but instead of reading from the designated location, the instruction copies the effective address to the destination
assembly - Why is %cl the only register the sal-operation will accept . . . Today while working on an x86 Assembly-project I tried left-shifting the value of the %rax register by the value of %rbx using the salq -operation, but couldn't get it to work Shifting with an immediate value worked fine, of course, but why I couldn't use the register I had no idea
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