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If the thing we're ranging over is an array or ptr to array, and it doesn't have a function call or channel receive in it, then we shouldn't evaluate it. Typecheck the ranged-over value as a constant in that case. That makes the unified exporter replace the range expression with a constant int. Change-Id: I0d4ea081de70d20cf6d1fa8d25ef6cb021975554 Reviewed-on: https://go-review.googlesource.com/c/go/+/659317 Reviewed-by: Junyang Shao <shaojunyang@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Robert Griesemer <gri@google.com>
54 lines
1011 B
Go
54 lines
1011 B
Go
// asmcheck
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// Copyright 2022 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test that optimized range memclr works with pointers to arrays.
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// The clears get inlined, see https://github.com/golang/go/issues/56997
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package codegen
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type T struct {
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a *[10]int
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b [10]int
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s []int
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}
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func (t *T) f() {
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// amd64:-".*runtime.memclrNoHeapPointers"
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// amd64:"DUFFZERO"
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for i := range t.a {
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t.a[i] = 0
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}
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// amd64:-".*runtime.memclrNoHeapPointers"
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// amd64:"DUFFZERO"
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for i := range *t.a {
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t.a[i] = 0
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}
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// amd64:-".*runtime.memclrNoHeapPointers"
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// amd64:"DUFFZERO"
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for i := range t.a {
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(*t.a)[i] = 0
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}
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// amd64:-".*runtime.memclrNoHeapPointers"
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// amd64:"DUFFZERO"
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for i := range *t.a {
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(*t.a)[i] = 0
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}
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// amd64:-".*runtime.memclrNoHeapPointers"
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// amd64:"DUFFZERO"
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for i := range t.b {
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t.b[i] = 0
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}
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// amd64:".*runtime.memclrNoHeapPointers"
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for i := range t.s {
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t.s[i] = 0
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}
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}
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