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| author | Matt Turner <mattst88@gmail.com> | 2008-03-19 18:17:10 -0400 |
|---|---|---|
| committer | Alex Deucher <alex@samba.(none)> | 2008-03-19 18:17:10 -0400 |
| commit | 17cd42ed31814ba329a6a68edd0d75390a7da40e (patch) | |
| tree | 7fbf87fdf2e6369bf0ad99aba0d91da21589dbaa /src/theatre_module.c | |
| parent | c83827b4d2b6f03c54429e757a756eb99ff8be6b (diff) | |
Enable BSR in Log2 functions
This patch edits RADEONLog2 and ATILog2 to use the x86 BSR instruction instead
of looping through bits. It should provide a somewhat of a speed increase in
this function on x86 and AMD64 architectures.
Note: the BSR instruction was added with the 80386 CPU and is therefore not
compatible with earlier CPUs, though I highly doubt it's even possible to use a
286 in conjunction with a Radeon.
The inline assembly also works with Intel's compiler (icc).
Diffstat (limited to 'src/theatre_module.c')
0 files changed, 0 insertions, 0 deletions