bugProgramming from the Ground Up Book - Bugs: bug #18506, Does mul have two syntaxes?

 
 

bug #18506: Does mul have two syntaxes?

Submitter:  None
Submitted:  Mon 11 Dec 2006 09:56:54 PM UTC
   
 
Category:  None Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  None Privacy:  Public
Assigned to:  None Open/Closed:  Open
* Mandatory Fields

Post a Comment

Add a New Comment Rich Markup
   

Discussion

Thu 17 May 2007 10:21:24 AM UTC, comment #1: 

mul and imul are single Operand instructions.
They additionally take values in al, ax, eax and store in dx, dx:ax , edx:eax respectively, because of the possibility of an overflow.
The second version dx:ax already existed on 16-bit arch.

Anonymous
Mon 11 Dec 2006 09:56:54 PM UTC, original submission:  

When I assemble this using as:

mul %eax, %ecx

the following error occurs:
Error: suffix or operands invalid for `mul'

According to some folks on freenode #asm, this syntax for mul does not exist. Instead, mul takes one operand and stores the result into %edx:%eax.

Anonymous

 

Attached Files

This item currently has no attached files.

(Note: upload size limit is set to 4.0MiB, after insertion of the required escape characters.)

Attach Files:
   
   
Comment:
   

 

Dependencies

This item does not depend on any other items.

No items depend on this one.

 

Mail Notification Carbon-Copy List

 

Votes

There are 0 votes so far. Votes easily highlight which items people would like to see resolved in priority, independently of the priority of the item set by tracker managers.

Only logged-in users can vote.

 

Please enter the title of George Orwell's famous dystopian book (it's a date):

History

No changes have been made to this item

Back to the top

Powered by Savane 3.16-2753.
Corresponding source code