OR instruction

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Fatih

Joined: 13 Nov 2010
Posts: 6

Fatih 23 Nov 2010, 10:39

Code:

use64

main:
        or      rax,0xfffffff0
        ret

when i used "or instruction" on 64 bit code, i get compiler error "value out of range"

AMD64 Architecture Programmer’s Manual Volume 3:
----------------------------------------------------------------------
OR reg/mem64, imm32

23 Nov 2010, 10:39

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8135
Location: Kraków, Poland

Tomasz Grysztar 23 Nov 2010, 10:42

Fatih wrote:

AMD64 Architecture Programmer’s Manual Volume 3:
----------------------------------------------------------------------
OR reg/mem64, imm32

This is the signed immediate value. Did you mean

Code:

or rax,-10h

?
If you wanted the unsigned 0xfffffff0 value (with higher 32 bits zeroed) as immediate, then there's no OR form that would do that in long mode - thus the error.

23 Nov 2010, 10:42

Fatih

Joined: 13 Nov 2010
Posts: 6

Fatih 23 Nov 2010, 10:50

Thanks Tomasz for Quick Reply

23 Nov 2010, 10:50

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