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compare 2 double register and a value possible?

 
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Brian-1337-
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PostPosted: Sun May 01, 2016 8:27 pm    Post subject: compare 2 double register and a value possible? Reply with quote
example is this -> cmp rdx,20B30D30000.

the result becomes cmp rdx,30D30000 when I run the code and looked at the opcode. I've tried cmp dword rdx,20B30D30000 but gives me error. the result I wanted is to compare it to 20B30D30000 not 30D30000.

can anyone pls help me? thanks in advance Smile
and sorry if i posted in the wrong section. feel free to move it
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ParkourPenguin
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PostPosted: Sun May 01, 2016 9:49 pm    Post subject: Reply with quote
There is no addressing mode of the cmp instruction that uses an imm64 operand. You can, however, move an imm64 into another register and compare the two registers:
Code:
mov rcx,20B30D30000
cmp rdx,rcx


Also, a word is 2 bytes long. A double word (dword) is double that, or 4 bytes long. A quad word (qword), as you can guess, is 8 bytes long. The value 0x20B30D30000 takes up 6 bytes. Trying to store it in a dword would throw away the most significant 2 bytes (020B) resulting in the value you see.
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Brian-1337-
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PostPosted: Sun May 01, 2016 9:56 pm    Post subject: Reply with quote
ParkourPenguin wrote:
There is no addressing mode of the cmp instruction that uses an imm64 operand. You can, however, move an imm64 into another register and compare the two registers:
Code:
mov rcx,20B30D30000
cmp rdx,rcx


Also, a word is 2 bytes long. A double word (dword) is double that, or 4 bytes long. A quad word (qword), as you can guess, is 8 bytes long. The value 0x20B30D30000 takes up 6 bytes. Trying to store it in a dword would throw away the most significant 2 bytes (020B) resulting in the value you see.
I see... thank you so much for simple good answer. Smile Smile
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