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Diffstat (limited to 'rts/gmp/mpn/cray/README')
| -rw-r--r-- | rts/gmp/mpn/cray/README | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/rts/gmp/mpn/cray/README b/rts/gmp/mpn/cray/README new file mode 100644 index 0000000000..8195c67e21 --- /dev/null +++ b/rts/gmp/mpn/cray/README @@ -0,0 +1,14 @@ +The (poorly optimized) code in this directory was originally written for a +j90 system, but finished on a c90. It should work on all Cray vector +computers. For the T3E and T3D systems, the `alpha' subdirectory at the +same level as the directory containing this file, is much better. + +* `+' seems to be faster than `|' when combining carries. + +* It is possible that the best multiply performance would be achived by + storing only 24 bits per element, and using lazy carry propagation. Before + calling i24mult, full carry propagation would be needed. + +* Supply tasking versions of the C loops. + + |