77a9cb9b4c
This change unifies the x and y cases. It shrinks evacuate's machine code by ~25% and its stack size by ~15%. It also eliminates a critical branch. Whether an entry should go to x or y is designed to be unpredictable. As a result, half of the branch predictions for useX were wrong. Mispredicting that branch can easily incur an expensive cache miss. Switching to an xy array allows elimination of that branch, which in turn reduces cache misses. Change-Id: Ie9cef53744b96c724c377ac0985b487fc50b49b1 Reviewed-on: https://go-review.googlesource.com/54653 Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> |
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The Go Programming Language
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