Bug Report: movq gpr, xmm

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StarKnightD

Joined: 04 Jul 2007
Posts: 38

StarKnightD 04 Jul 2007, 10:31

I get the following error while running FASMW 1.67.18

Error: operand sizes do not match

Instruction:
movq rax, xmm4

I read in the updates that there was an earlier bug related to this instruction which was fixed.

I replaced rax with rbx, rcx, rdx, rsi, and rdi however they all give the same error. I also tried changing the xmm register, without success.

Thanks,
Stefan

04 Jul 2007, 10:31

Feryno

Joined: 23 Mar 2005
Posts: 509
Location: Czech republic, Slovak republic

Feryno 04 Jul 2007, 11:59

and it is even worse according AMD manuals, this instruction should be encoded as
movd rax,xmm0
even it moves qword
movd instruction in AMD manuals means move 32-bit as well 64-bit ...
http://board.flatassembler.net/topic.php?p=53590#53590

04 Jul 2007, 11:59

StarKnightD

Joined: 04 Jul 2007
Posts: 38

StarKnightD 04 Jul 2007, 17:06

actually, I use an Intel Core 2. as for FasmW, I tried using movd rax, xmm4 but it givies me an "invalid size of operand" error.

04 Jul 2007, 17:06

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo 12 Jul 2007, 20:10

Does it work with any other x86-64 assembler (e.g. YASM)? That would make it easier to be sure it was a bug or not.

12 Jul 2007, 20:10

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 12 Jul 2007, 23:25

from intel manual:

Quote:

66 0F 6E /r MOVD xmm, ValidValidMove doubleword from
r/m32 r/m32 to xmm.
REX.W 66 0F 6E /r MOVQ xmm, ValidN.E.Move quadword from r/m64
r/m64 to xmm.
66 0F 7E /r MOVD r/m32, ValidValidMove doubleword from
xmm xmm register to r/m32.
REX.W 66 0F 7E /r MOVQ r/m64, Valid N.E.Move quadword from xmm
xmm register to r/m64.

looks like FASM bug to me... :/

i hope tomasz will get back soon, and fix all those bugs found recently

12 Jul 2007, 23:25

DOS386

Joined: 08 Dec 2006
Posts: 1900

DOS386 12 Jul 2007, 23:58

> hope tomasz will get back soon, and fix all those bugs found

And I hope the 16-bit, 32-bit and bit-neutral issues will also get addressed Wink

12 Jul 2007, 23:58

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