BT opcode...

[Ben Skeggs]

BT can only take an 8 bit immediate, just like SHL, SHR etc.
And doing "bt [rax],byte 1" does not assemble either.

Ben.

Peter Johnson wrote:

>I've not checked this, but all you probably need to do is specify a size,
>e.g. "bt dword [rax], 1" or "bt [rax], dword 1".  With just a memory
>reference and an immediate value, YASM has no way to infer the data size.
>
>Peter
>
>On Wed, 9 Jun 2004, Ben Skeggs wrote:
>
>  
>
>>YASM appears to be missing the encoding for the AMD64 instruction
>>
>>bt [rax],1
>>
>>Other AMD64 encodings, like:
>>    bt rax,rbx
>>    bt [rax],rbx
>>    bt rax,1
>>Appear to be fine, well according to a disassembly from objdump anyway.
>>
>>Ben Skeggs
>>
>>
>>
>>
>>
>>
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>>
>>    
>>

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