movq bug: movq xmm,mm is allowed!

flat assembler
Message board for the users of flat assembler.

Index > Compiler Internals > movq bug: movq xmm,mm is allowed!

Author

Thread

Nicodemus

Joined: 11 Feb 2008
Posts: 6

Nicodemus 11 Feb 2008, 22:33

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: 20761
Location: In your JS exploiting you and your system

revolution 12 Feb 2008, 02:11

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: 8466
Location: Kraków, Poland

Tomasz Grysztar 12 Feb 2008, 06:48

Will be fixed in 1.67.27

12 Feb 2008, 06:48

Madis731

Joined: 25 Sep 2003
Posts: 2138
Location: Estonia

Madis731 13 Feb 2008, 10:15

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

13 Feb 2008, 10:15

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum