661146bc0b
We don't need this special loop construct anymore now that we do conservative GC scanning of the top of stack. Rewrite instead to a simple pointer increment on every iteration. This leads to having a potential past-the-end pointer at the end of the last iteration, but that value immediately goes dead after the loop condition fails, and the past-the-end pointer is never live across any call. This simplifies and speeds up loops. R=go1.20 TODO: actually delete all support for OFORUNTIL. It is now never generated, but code to handle it (e.g. in ssagen) is still around. TODO: in "for _, x := range" loops, we could get rid of the index altogether and use a "pointer to the last element" reference to determine when the loop is complete. Fixes #53409 Change-Id: Ifc141600ff898a8bc6a75f793e575f8862679ba1 Reviewed-on: https://go-review.googlesource.com/c/go/+/414876 Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com> Reviewed-by: Heschi Kreinick <heschi@google.com> Reviewed-by: Keith Randall <khr@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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