MOVSX
DATAXFER I386 x86_64
MOVSX is an instruction of the x86_64 architecture (x86 / x86-64 (covers 16/32/64-bit modes)), category DATAXFER. This page lists its 4 encoding forms, distinguished by opcode bytes: 0F, BE, BF.
Each form below links to its full decode: the operand roles and where each one is encoded in the instruction, the flag and register effects, and any micro-op sequence authored for it.
X86_MOVSX_X86_LEGACY_0F_BF_190287
ry, r16/m16
XED_MOVSX_GPRv_MEMw MOVSX_GPR64_MEMw MOVSX_GPR16_MEMw MOVSX_GPR32_MEMw
REG0=GPRv_R():w MEM0:r:w REG0=GPR64_R():w MEM0:r:w REG0=GPR16_R():w MEM0:r:w REG0=GPR32_R():w MEM0:r:w
XED_MOVSX_X86_LEGACY_0F_BE_668404
REG0=GPRv_R():w REG1=GPR8_B():r REG0=GPRv_R():w REG1=GPR16_B():r
XED_MOVSX_X86_LEGACY_0F_BE_961000
REG0=GPRv_R():w MEM0:r:b