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cmd/compile/internal/ssagen: fix misleading comment

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Fix up a slightly stale comment in the part of ssa generation that
zeros ambiguously live variables: with the advent of the register ABI,
the ir.Func "Dcl" slice is no longer entirely sorted by frame offset,
although this is still the case for the local vars in Dcl.

Change-Id: I633f43d16f0d4e0b444193a6edb6b2aa1154eea7
Reviewed-on: https://go-review.googlesource.com/c/go/+/316309
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Than McIntosh 2021-05-03 09:32:22 -04:00
parent d75fbac54d
commit 472f519fe2
1 changed files with 2 additions and 1 deletions
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3
src/cmd/compile/internal/ssagen/ssa.go
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@ -7148,7 +7148,8 @@ func defframe(s *State, e *ssafn, f *ssa.Func) {
// keep track of which helper registers have been zeroed. // keep track of which helper registers have been zeroed.
var state uint32 var state uint32
// Iterate through declarations. They are sorted in decreasing Xoffset order. // Iterate through declarations. Autos are sorted in decreasing
// frame offset order.
for _, n := range e.curfn.Dcl { for _, n := range e.curfn.Dcl {
if !n.Needzero() { if !n.Needzero() {
continue continue