97c48fd93d
When we are about to enter a loop, we try to put values that will be used soon into registers, so we put them into registers once outside the loop instead of N times inside the loop. But we currently don't kick out values we won't use for a while to make room. This CL does that. So even if register pressure is large around the loop, we can still use registers for all the in-loop values. The values generating the register pressure, but not used inside the loop, will get spilled around the loop. This is particularly useful for Phi arguments. We want to promote from fixed zero registers or other rematerializeable values to a general register before the loop starts. Fixes #77299 Change-Id: I00efc3d3014163aaf377693830c7d7957eaa515f Reviewed-on: https://go-review.googlesource.com/c/go/+/743640 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Junyang Shao <shaojunyang@google.com>
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