Bug Report: movq gpr, xmm

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StarKnightD

Joined: 04 Jul 2007
Posts: 38

StarKnightD

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: 471
Location: Czech republic, Slovak republic

Feryno

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

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

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

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: 1901

DOS386

> 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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