e283473ebb
The type of the source and destination of a memmove call isn't always accurate. It will always be a pointer (or an unsafe.Pointer), but the base type might not be accurate. This comes about because multiple copies of a pointer with different base types are coalesced into a single value. In the failing example, the IData selector of the input argument is a *[32]byte in one branch of the type switch, and a *[]byte in the other branch. During the expand_calls pass both IDatas become just copies of the input register. Those copies are deduped and an arbitrary one wins (in this case, *[]byte is the unfortunate winner). Generally an op v can rely on v.Type during rewrite rules. But relying on v.Args[i].Type is discouraged. Fixes #55122 Change-Id: I348fd9accf2058a87cd191eec01d39cda612f120 Reviewed-on: https://go-review.googlesource.com/c/go/+/431496 TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Cherry Mui <cherryyz@google.com> Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Keith Randall <khr@google.com> |
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The Go Programming Language
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