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cmd/compile: use new for loop semantics for Go 1.22+ compilations

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This includes version-dependent support for GOEXPERIMENT and
-d=loopvar, -d=loopvarhash, to allow testing/porting of old code.

Includes tests of downgrade (1.22 -> 1.21) and upgrade (1.21 -> 1.22)
based on //go:build lines (while running a 1.22 build/compiler).

Change-Id: Idd3be61a2b46acec33c7e7edac0924158cc726b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/508819
Run-TryBot: David Chase <drchase@google.com>
Reviewed-by: Russ Cox <rsc@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
David Chase 2023-07-05 16:21:19 -04:00
parent 6d8d88a707
commit fe1daf2e43
7 changed files with 239 additions and 12 deletions
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2
src/cmd/compile/internal/loopvar/loopvar.go
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@ -605,7 +605,7 @@ func LogTransformations(transformed []VarAndLoop) {
// Intended to help with performance debugging, we record whole loop ranges
logopt.LogOptRange(pos, last, "loop-modified-"+loopKind, "loopvar", ir.FuncName(l.curfn))
}
if print && 3 <= base.Debug.LoopVar {
if print && 4 <= base.Debug.LoopVar {
// TODO decide if we want to keep this, or not. It was helpful for validating logopt, otherwise, eh.
inner := base.Ctxt.InnermostPos(pos)
outer := base.Ctxt.OutermostPos(pos)