[MLton] flattening of arrays and vectors
Thu, 12 Aug 2004 16:23:12 -0700
Flattening of arrays and vectors passes all regressions, benchmarks,
and self compiles. It is now enabled by default.
If you want to see if it has any effect on your program, try compiling
with and without -drop-pass deepFlatten. The name "deepFlatten" is
because the pass does more than just array flattening. It also does
flattening into ref cells (e.g. an (int * int) ref is represented
without an additional indirection to the tuple).
The pass didn't have much of an effect on the benchmarks -- in fact,
it only kicked in on the following ones.
MLton0 -- mlton -drop-pass deepFlatten
MLton1 -- mlton
run time ratio
benchmark MLton0 MLton1
flat-array 52,515 52,339
hamlet 1,295,249 1,295,441
mlyacc 549,030 549,622
model-elimination 674,252 674,124
raytrace 301,955 302,083
simple 279,292 279,228
tyan 183,577 183,449
vliw 431,882 431,946
zebra 162,361 162,441
These numbers include a new micro-benchmark, flat-array.sml, that I
added to show what's possible.
Please try out the compiler on your programs and report any
This is the last major addition that I planned on before doing an
experimental release, which will begin the process leading up to our
(hopefully September) public release.