[cairo-bugs] [Bug 4706] New: SSE configuration excludes SSE capable CPUs

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https://bugs.freedesktop.org/show_bug.cgi?id=4706          
     
           Summary: SSE configuration excludes SSE capable CPUs
           Product: cairo
           Version: 1.0.2
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: general
        AssignedTo: cworth at cworth.org
        ReportedBy: stevech1097 at yahoo.com.au
         QAContact: cairo-bugs at cairographics.org


cairo/pixman/fbmmx.c has lines:
#if defined(__amd64__) || defined(__x86_64__)
#define USE_SSE
#endif

which excludes the Athlon-XP (which supports SSE) from running the SSE code.
(It looks like its excluding the Pentium 3 and Pentium 4 which also
support SSE)

Attached patch allows the Athlon-XP to run the SSE code.
Tested on my system with the imagepattern gtk snippet - the SSE version
of expand_alpha is called and works OK.

It seems odd having MMX selected at run-time and then selecting
SSE at compile-time. I think run-time detection for SSE may be a better
solution.          
     
     
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