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cmd/compile: SSA ".this" variable

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We used to not SSA ".this" variable, because in tail-call method
wrappers it relies on updating ".this" in place in memory, and
the tail call IR node and SSA op do not have an explicit use of
".this". It is no longer the case for the new tail call
representation. Remove the restriction.

Change-Id: I4e1ce8459adbb0d5a80c64f1ece982737bd95305
Reviewed-on: https://go-review.googlesource.com/c/go/+/350751
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cherry Mui 2021-09-17 16:26:13 -04:00
parent f01721efb9
commit 4b654c0eec
1 changed files with 0 additions and 6 deletions
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6
src/cmd/compile/internal/ssagen/ssa.go
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@ -5311,12 +5311,6 @@ func (s *state) canSSAName(name *ir.Name) bool {
return false
}
}
if name.Class == ir.PPARAM && name.Sym() != nil && name.Sym().Name == ".this" {
// wrappers generated by genwrapper need to update
// the .this pointer in place.
// TODO: treat as a PPARAMOUT?
return false
}
return true
// TODO: try to make more variables SSAable?
}