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

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