movq bug: movq xmm,mm is allowed!

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Nicodemus

Joined: 11 Feb 2008
Posts: 6

Nicodemus

Hi there!

fasm 1.67.26 compiles code like:

Code:

movq xmm1, mm0

but this is no legal instruction!
MOVQ must not move between XMM and MMX registers.

What is worse is that fasm actually generates the following opcode from the statement above, which makes debugging extremely difficult:

Code:
movq xmm1, xmm0

Please fix this issue!

Thanks in advance!
Nicodemus

11 Feb 2008, 22:33

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17865
Location: In your JS exploiting you and your system

revolution

I think the assembler thinks you just missed out a letter 'x' and decided to be nice about it and "correct" it for you rather than punish you with an error message. Wink

But seriously, good find.

12 Feb 2008, 02:11

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 7845
Location: Kraków, Poland

Tomasz Grysztar

Will be fixed in 1.67.27

12 Feb 2008, 06:48

Madis731

Joined: 25 Sep 2003
Posts: 2140
Location: Estonia

Madis731

The error message will look like: "Hey, U missed an 'x' there m8 Wink

13 Feb 2008, 10:15

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