显然，你需要使用loop和xchg指令。这两条指令都非常慢，所以在下一段代码中也没有理由使用更好的movzx...
The XCHG instruction can also be used instead of the BSWAP instruction for 16-bit operands. In 64-bit mode, the instruction’s default operation size is 32 bits. Using a REX prefix in the form of REX.R permits access to additional registers (R8-R15). Using a REX prefix in the form ...
The XCHG instruction can also be used instead of the BSWAP instruction for 16-bit operands. In 64-bit mode, the instruction’s default operation size is 32 bits. Using a REX prefix in the form of REX.R permits access to additional registers (R8-R15). Using a REX prefix in the form ...
Documentation Home > IA-32 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Exchange Instructions > Exchange Register / Memory With Register (xchg) IA-32 Assembly Language Reference Manual Previous: Exchange And Add (xadd) [486] Next: Miscellaneous Instructions...
staticloadGeneric(PPCEmuAssembler& a, Instruction instr){if((flags & LoadZeroRA) && instr.rA ==0) { a.mov(a.ecx,0u); }else{ a.mov(a.ecx, a.ppcgpr[instr.rA]); }if(flags & LoadIndexed) { a.add(a.ecx, a.ppcgpr[instr.rB]); ...
Why do Windows functions all begin with a pointless MOV EDI, EDI instruction?。看起来当前的热...
jnz spin_lock ; Jump back to the MOV instruction if the Zero Flag is ; not set; the lock was previously locked, and so ; we need to spin until it becomes unlocked. ret ; The lock has been acquired, return to the calling ; function. ...
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Documentation Home > IA-32 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Exchange Instructions > Exchange Register / Memory With Register (xchg) IA-32 Assembly Language Reference Manual Previous: Exchange And Add (xadd) [486] Next: Miscellaneous Instructions...