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[SOLVED] Unrecognized Opcodes
MathMan:
Hi all,
I am using Lazarus 1.2.4 with FPC 2.6.4 under Windows 7/64bit on a Core i5 430M @2,27GHz.
There are the very nifty ADCX / ADOX opcodes which the internal assmbler does not seem to know.
--- Code: --- @Loop1:
align 4
mov RAX, qword ptr [RSI+8*RDX]; // Get next limb
adcx RAX, qword ptr [RBX+8*RDX]; // Add and only affect CF
mov qword ptr [RDI+8*RDX], RAX; // Store the result
--- End code ---
The above throws
--- Code: ---main.pas(480,5) Error: Unrecognized opcode ADCX
--- End code ---
Is anybody around here who can comment on the following
* is it planned to integrate ADCX / ADOX opcode support to the internal assembler
* as I am aware that potentially nobody beside me wants to use these opcodes how are the chances if I raise a corresponding feature request for FPC
Thanks in advance
BigChimp:
Regarding the seoncd issue: if these are valid opcodes, IMO there is no reason NOT to raise the bugtracker issue.
MathMan:
--- Quote from: BigChimp on July 31, 2014, 10:12:02 am ---Regarding the seoncd issue: if these are valid opcodes, IMO there is no reason NOT to raise the bugtracker issue.
--- End quote ---
All I can say is that they are documented in 64-ia-32-architectures-software-developer-manual-325462 and belong to the category general purpose instructions ...
BigChimp:
Don't post here, post on the bugtracker ;) <smiles> (& thanks!)
engkin:
For limited usage of these missing opcodes, you might be able to do your tests with something like:
--- Code: --- //adcx RAX, [RBX+8*RDX]; // Add and only affect CF
db 066H db 048H db 00FH db 038H db 0F6H db 004H db 0D3H
--- End code ---
I used Flat Assembler to get these numbers.
If you do write a bug report, please post a link to it here.
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