David Chase cc258e6785 cmd/compile: add "deadlocals" pass to remove unused locals ... This CL adds a "deadlocals" pass, which runs after inlining and before escape analysis, to prune any unneeded local variables and assignments. In particular, this helps avoid unnecessary Addrtaken markings from unreachable closures. Deadlocals is sensitive to "_ = ..." as a signal of explicit use for testing. This signal occurs only if the entire left-hand-side is "_" targets; if it is `_, ok := someInlinedFunc(args)` then the first return value is eligible for dead code elimination. Use this (`_ = x`) to fix tests broken by deadlocals elimination. Includes a test, based on one of the tests that required modification. Matthew Dempsky wrote this, changing ownership to allow rebases, commits, tweaks. Fixes #65158. Old-Change-Id: I723fb69ccd7baadaae04d415702ce6c8901eaf4e Change-Id: I1f25f4293b19527f305c18c3680b214237a7714c Reviewed-on: https://go-review.googlesource.com/c/go/+/600498 Reviewed-by: Keith Randall <khr@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@golang.org> Auto-Submit: David Chase <drchase@google.com> Commit-Queue: David Chase <drchase@google.com>		2024-07-30 15:46:27 +00:00
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main.go	cmd/compile: add "deadlocals" pass to remove unused locals	2024-07-30 15:46:27 +00:00