[PATCH] D29627: Compile time decreasing in the case we're dealing with Machine Combiner

[Andrew V. Tischenko via Phabricator via llvm-commits]

avt77 added a comment.

Just for your info: I collected the perf numbers.

DAGCombiner - trunk

time ./llc spill_fdiv.ll -o /dev/null -enable-unsafe-fp-math
real  0m1.685s

DAGCombiner + Speed patch

time ./llc spill_fdiv.ll -o /dev/null -enable-unsafe-fp-math
real  0m1.655s

MachineCombiner w/o Speed patch

time ./llc spill_fdiv.ll -o /dev/null -enable-unsafe-fp-math
real  0m21.614s

MachineCombiner + Speed patch

time ./llc spill_fdiv.ll -o /dev/null -enable-unsafe-fp-math
real  0m1.593s


https://reviews.llvm.org/D29627