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| author | Martin Möhrmann <martin@golang.org> | 2021-07-06 21:45:02 +0200 |
|---|---|---|
| committer | Martin Möhrmann <martin@golang.org> | 2021-08-23 19:49:23 +0000 |
| commit | 0a7f00ae239570d664488085f9c395919bc69066 (patch) | |
| tree | f22eaba8bf470e8968be6f761fdd2fe86a7c5a09 /src/cmd/compile | |
| parent | 6b9e3f883e6820a1e94448ca81eba62341cd4836 (diff) | |
| download | go-0a7f00ae239570d664488085f9c395919bc69066.tar.gz go-0a7f00ae239570d664488085f9c395919bc69066.zip | |
cmd/compile: do not mark arrays used for map initialization noalg
Arrays marked noalg are created by the compiler to hold keys and values
to initialize map literals. The ssa backend creates a pointer type for
the array type when creating an OpAddr while processing the loop that
initializes the map from the arrays. The pointer type does not inherit
the noalg property but points to the noalg array type.
This causes values created through reflect of types that should be
equal to compare unequal because the noalg and alg type might be
compared and these are not the same.
A similar problem occurred in #32595 for argument arrays of defer structs.
Created #47904 to track improve noalg handling to be able to
reintroduce this optimization again.
Fixes #47068
Change-Id: I87549342bd404b98d71a3c0f33e3c169e9d4efc8
Reviewed-on: https://go-review.googlesource.com/c/go/+/344349
Trust: Martin Möhrmann <martin@golang.org>
Run-TryBot: Martin Möhrmann <martin@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Diffstat (limited to 'src/cmd/compile')
| -rw-r--r-- | src/cmd/compile/internal/walk/complit.go | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/cmd/compile/internal/walk/complit.go b/src/cmd/compile/internal/walk/complit.go index 6c6b4982a0..e8e941dd91 100644 --- a/src/cmd/compile/internal/walk/complit.go +++ b/src/cmd/compile/internal/walk/complit.go @@ -440,8 +440,8 @@ func maplit(n *ir.CompLitExpr, m ir.Node, init *ir.Nodes) { tk := types.NewArray(n.Type().Key(), int64(len(entries))) te := types.NewArray(n.Type().Elem(), int64(len(entries))) - tk.SetNoalg(true) - te.SetNoalg(true) + // TODO(#47904): mark tk and te NoAlg here once the + // compiler/linker can handle NoAlg types correctly. types.CalcSize(tk) types.CalcSize(te) |