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cmd/compile: don't generate algs for map buckets
Note that this is only safe because the compiler generates multiple distinct gc.Types. If we switch to having canonical gc.Types, then this will need to be updated to handle the case in which the user uses both map[T]S and also map[[8]T]S. In that case, the runtime needs algs for [8]T, but this could mark the sole [8]T type as Noalg. This is a general problem with having a single bool to represent whether alg generation is needed for a type. Cuts 5k off cmd/go and 22k off golang.org/x/tools/cmd/godoc, approx 0.04% and 0.12% respectively. For #6853 and #9930 Change-Id: I30a15ec72ecb62e2aa053260a7f0f75015fc0ade Reviewed-on: https://go-review.googlesource.com/19769 Reviewed-by: David Crawshaw <crawshaw@golang.org> Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -102,13 +102,18 @@ func mapbucket(t *Type) *Type {
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valtype = Ptrto(valtype)
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valtype = Ptrto(valtype)
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}
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}
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field := make([]*Field, 0, 5)
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// The first field is: uint8 topbits[BUCKETSIZE].
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// The first field is: uint8 topbits[BUCKETSIZE].
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arr := typArray(Types[TUINT8], BUCKETSIZE)
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arr := typArray(Types[TUINT8], BUCKETSIZE)
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field := make([]*Field, 0, 5)
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field = append(field, makefield("topbits", arr))
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field = append(field, makefield("topbits", arr))
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arr = typArray(keytype, BUCKETSIZE)
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arr = typArray(keytype, BUCKETSIZE)
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arr.Noalg = true
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field = append(field, makefield("keys", arr))
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field = append(field, makefield("keys", arr))
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arr = typArray(valtype, BUCKETSIZE)
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arr = typArray(valtype, BUCKETSIZE)
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arr.Noalg = true
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field = append(field, makefield("values", arr))
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field = append(field, makefield("values", arr))
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// Make sure the overflow pointer is the last memory in the struct,
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// Make sure the overflow pointer is the last memory in the struct,
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