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Intel Pentium CPU Instruction Set Reference

MOVZX instruction - Move with Zero-Extend

Code Mnemonic Description
0F B6 / r MOVZX r16, r/m8 Move byte to word with zero-extension
0F B6 / r MOVZX r32, r/m8 Move byte to doubleword, zero-extension
0F B7 / r MOVZX r32, r/m16 Move word to doubleword, zero-extension


Copies the contents of the source operand (register or memory location) to the destination operand (register) and zero extends the value to 16 or 32 bits. The size of the converted value depends on the operand-size attribute.

Operands Bytes Clocks
reg, reg 3 3 NP
reg, mem 3 + d(0, 1, 2, 4) 3 NP

(Note: destination reg is 16 or 32-bits; source is 8 or 16 bits)


ID unaffected DF unaffected
VIP unaffected IF unaffected
VIF unaffected TF unaffected
AC unaffected SF unaffected
VM unaffected ZF unaffected
RF unaffected AF unaffected
NT unaffected PF unaffected
IOPL unaffected CF unaffected
OF unaffected