[Bug 2357] New: Speeding up render on Alpha with MVI instructions

[bugzilla-daemon@freedesktop.org]

Please do not reply to this email: if you want to comment on the bug, go to            
the URL shown below and enter yourcomments there.     
   
https://bugs.freedesktop.org/show_bug.cgi?id=2357          
     
           Summary: Speeding up render on Alpha with MVI instructions
           Product: xorg
           Version: CVS_head
          Platform: DEC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Server/general
        AssignedTo: xorg-bugzilla-noise@freedesktop.org
        ReportedBy: falk@debian.org


This is a patch to use special instructions on the Alpha architecture to speed
up rendering operations. It is based on the similar works for i386 using MMX
instructions (Bug 839). Instead of modifying fbmmx.c, I chose to reimplement
mmintrin.h for Alpha. This should already give noticeably better code for most 
cases.

The patch is not quite finished, but I was hoping to get some feedback. In
particular, is there any documentation on the functions in fbmmx.c? For example
about expected alignment of arguments? I'm currently running into unaligned
accesses for example in fbCompositeSrcAdd_8888x8888mmx. Apparently i386 does
not care, but on the Alpha architecture, this incurs a trap to the OS, which
is why this patch doesn't really speed anything up yet...          
     
     
--           
Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email         
     
------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.