Commit Graph

3 Commits

Author SHA1 Message Date
Erik Eckstein
c343ab6907 ArrayElementValuePropagation: fix a wrong substituted function type for the generated reserveCapacity function call 2017-04-27 14:50:58 -07:00
Erik Eckstein
76eca003bb ArrayElementValuePropagation: explicitly reserve space for new elements when doing the array-content-of optimization
When Array.append(contentOf:) is replaced by individual Array.append(element) calls, an explicit reserveCapacityForAppend is inserted.
2017-04-27 09:06:56 -07:00
Erik Eckstein
777f5aaf7a SILOptimizer: Replace [].append(contentsOf:) with [].append(element:)
if the argument is an array literal.

For example:
  arr += [1, 2, 3]

is replaced by:
  arr.append(1)
  arr.append(2)
  arr.append(3)

This gives considerable speedups up to 10x (for our micro-benchmarks which test this).

This is based on the work of @ben-ng, who implemented the first version of this optimization (thanks!).
2017-03-31 17:16:31 -07:00