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cmd/compile: do not write implicit conversion for append in Unified IR

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Same as CL 418475, but for Unified IR.

Updates #53888
Fixes #54337

Change-Id: I31d5a7af04d8e3902ed25db85009d46ea4c38dbe
Reviewed-on: https://go-review.googlesource.com/c/go/+/422040
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Reviewed-by: Than McIntosh <thanm@google.com>
This commit is contained in:
Cuong Manh Le 2022-08-09 02:55:42 +07:00
parent a292b3905c
commit 2699065483
2 changed files with 8 additions and 2 deletions
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7
src/cmd/compile/internal/noder/reader.go
View file

@ -1989,6 +1989,13 @@ func (r *reader) expr() (res ir.Node) {
case ir.OAPPEND:
n := n.(*ir.CallExpr)
n.RType = r.rtype(pos)
// For append(a, b...), we don't need the implicit conversion. The typechecker already
// ensured that a and b are both slices with the same base type, or []byte and string.
if n.IsDDD {
if conv, ok := n.Args[1].(*ir.ConvExpr); ok && conv.Op() == ir.OCONVNOP && conv.Implicit() {
n.Args[1] = conv.X
}
}
case ir.OCOPY:
n := n.(*ir.BinaryExpr)
n.RType = r.rtype(pos)