assembly - GAS, MOVQ Throws operand mismatch, when trying to copy rax to mmx register -


i'm using gnu assembly , gcc compiler. have make operations using mmx registers. i've got memory buffer of bytes, i'm reading 1 byte memory %al, making logical , operation , shifting rax left 1 byte , inserting on lower bits next byte memory until %rax gets full. when i'm trying do:

movq %rax, %mm0

compilers throws: error: operand type mismatch `movq'

examples:

this works:

   mov $0, %rcx\n"    movl , %ecx\n"    mov (%1, %rcx, 8), %rbx\n"    movq %rbx, %mm0

this don't:

mov (variable_that_contains_address, %rcx, 4), %rax ;get 4 bits memory movb %al, %bl  andb $0b00011111, %bl ;only lower 5 bits needed movb %bl, %dl ;store whole byte @ rdx shl $8, %rdx  ;make space next byte shr $5, %rax  ; need next 5 bits, because data in memory saved not in bytes  movb %al, %bl ;next 5 bits   ;repating until rdx full (some higher bits unused)  movq %rdx, %mm0 ; , compiler throws mismatch error

this code not full code - full code long. it's made intuition.

why hates me much? i'm doing wrong. please don't complain methodology of getting 5 bits, need storing rdx mm0.

movq %rbx, %mm0

give movd go?

don't forget if need 5 bits can use carry flag 1 byte

shr $5, %rax 10111

will set carry

shr $5, %rax  01110

will not


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