'movhlpd' and 'movlhpd' Illegal instructions, says FASM

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Index > Compiler Internals > 'movhlpd' and 'movlhpd' Illegal instructions, says FASM

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mattst88

Joined: 12 May 2006
Posts: 260
Location: South Carolina

mattst88 24 May 2006, 00:45

Any insight as to why FASM would say these two instructions ('movlhpd', 'movhlpd') are illegal? Just not been implemented maybe?

Edit: It doesn't seem gas recognizes them either.

24 May 2006, 00:45

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19098
Location: In your JS exploiting you and your system

revolution 24 May 2006, 01:23

That is for a good reason, the processor has no such instuctions.

24 May 2006, 01:23

mattst88

Joined: 12 May 2006
Posts: 260
Location: South Carolina

mattst88 24 May 2006, 04:34

Why would it appear on this page and why would r22 have used it in his code in this thread in that case?

24 May 2006, 04:34

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19098
Location: In your JS exploiting you and your system

revolution 24 May 2006, 07:06

I can't personally comment on other people postings but check the processor manuals from Intel and AMD, you won't find them listed. There are other instructions that can do the same thing so there is no need for such instructions.

24 May 2006, 07:06

mattst88

Joined: 12 May 2006
Posts: 260
Location: South Carolina

mattst88 24 May 2006, 16:22

Which instruction(s) should I replace these with?

Thanks, btw Smile

24 May 2006, 16:22

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19098
Location: In your JS exploiting you and your system

revolution 24 May 2006, 17:07

Quote:

Which instruction(s) should I replace these with?

MOVHLPS & MOVLHPS will work correctly with both single and double floats, also check out PSHUFD which generalises the data movements.

24 May 2006, 17:07

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