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David Chase authored
Loops of the form "for i,e := range" needed to have their condition rotated to the "bottom" for the preemptible loops GOEXPERIMENT, but this caused a performance regression because it degraded bounds check removal. For now, make the loop rotation/guarding conditional on the experiment. Fixes #20711. Updates #10958. Change-Id: Icfba14cb3b13a910c349df8f84838cf4d9d20cf6 Reviewed-on: https://go-review.googlesource.com/46410 Run-TryBot: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:
Keith Randall <khr@golang.org>
0b6fbaae