On 18-Aug-2015 13:45, Walter Bright wrote:
Martin ran some benchmarks recently that showed that ddmd compiled with
dmd was about 30% slower than when compiled with gdc/ldc. This seems to
be fairly typical.
I'm interested in ways to reduce that gap.
..
2. instruction selection patterns like should one generate:
SETC AL
MOVZ EAX,AL
or:
SBB EAX
NEG EAX
See section "Problematic instructions" here:
http://www.agner.org/optimize/optimizing_assembly.pdf
And some invaluable material on each CPU specifics for all x86 from
Pentium to Haswell and AMD from K6 toBuldozer:
http://www.agner.org/optimize/microarchitecture.pdf
Hope this helps.
--
Dmitry Olshansky
