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Keith Randall 4dcbb00be2 cmd/compile: teach prove about min/max phi operations
If there is a phi that is computing the minimum of its two inputs,
then we know the result of the phi is smaller than or equal to both
of its inputs. Similarly for maxiumum (although max seems less useful).

This pattern happens for the case

  n := copy(a, b)

n is the minimum of len(a) and len(b), so with this optimization we
know both n <= len(a) and n <= len(b). That extra information is
helpful for subsequent slicing of a or b.

Fixes #16833

Change-Id: Ib4238fd1edae0f2940f62a5516a6b363bbe7928c
Reviewed-on: https://go-review.googlesource.com/c/go/+/622240
Reviewed-by: Carlos Amedee <carlos@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
2024-10-29 16:46:48 +00:00
.github .github: update language change proposal template 2024-08-08 19:02:29 +00:00
api hash/maphash: add WriteComparable and Comparable 2024-10-02 15:54:11 +00:00
doc Revert "crypto/rand: add randcrash=0 GODEBUG" 2024-10-28 14:46:33 +00:00
lib lib/time: update to 2024b/2024b 2024-09-23 14:25:08 +00:00
misc misc/wasm: move wasm runtime files to lib/wasm 2024-08-30 19:15:21 +00:00
src cmd/compile: teach prove about min/max phi operations 2024-10-29 16:46:48 +00:00
test cmd/compile: teach prove about min/max phi operations 2024-10-29 16:46:48 +00:00
.gitattributes
.gitignore runtime,internal: move runtime/internal/sys to internal/runtime/sys 2024-07-23 19:05:35 +00:00
CONTRIBUTING.md
LICENSE LICENSE: update per Google Legal 2024-08-09 14:54:31 +00:00
PATENTS
README.md README: fix CC BY license name 2024-07-22 17:45:27 +00:00
SECURITY.md SECURITY.md: update the Reporting a Vulnerability link 2023-09-22 21:17:24 +00:00
codereview.cfg
go.env cmd/go: additional doc-inspired tests and bug fixes 2023-06-06 19:18:46 +00:00

README.md

The Go Programming Language

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