DRI Compilation Guide
: CPU Architectures
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5. CPU Architectures
In general, nothing special has to be done to use the DRI on
different CPU architectures. There are, however, a few
optimizations that are CPU-dependent. Mesa will determine at
runtime which CPU-dependent optimizations should be used and
enable them where appropriate.
5.1. Intel Pentium III Features
The Pentium III SSE instructions are used in
optimized vertex transformation functions in the Mesa-based
DRI drivers.
On Linux, SSE requires a recent kernel (such as 2.4.0-test11
or later) both at compile time and runtime.
5.2. AMD 3DNow! Features
AMD's 3DNow! instructions are used in optimized vertex
transformation functions in the Mesa-based DRI drivers.
3DNow! is supported in most versions of Linux.
5.3. Alpha Features
On newer Alpha processors a significant performance increase
can be seen with the addition of the -mcpu= option to GCC.
This option is dependent on the architecture of the processor.
For example, -mcpu=ev6 will build specifically for the EV6 based
AXP's, giving both byte and word alignment access to the
DRI/Mesa drivers.
To enable this optimization edit your xc/config/host.def file
and add the line:
#define DefaultGcc2AxpOpt -O2 -mcpu=ev6
Additional speed improvements to 3D rendering can be achieved
by installing Compaq's Math Libraries (CPML) which can be
obtained from http://www.support.compaq.com/alpha-tools/software/index.html
Once installed, you can add this line to your host.def to build
with the CPML libraries:
#define UseCompaqMathLibrary YES
The host.def file is explained below.
DRI Compilation Guide
: CPU Architectures
Previous: Linux Kernel Preparation
Next: Downloading the XFree86/DRI CVS Sources
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