tree b98848a32f244f6dab9536fc8a98fe2818037d2a
parent d3ba94164a1c404a01369fb54ddd4f5b94d91348
author Keith Randall <khr@golang.org> 1596130559 -0700
committer Carlos Amedee <carlos@golang.org> 1596467577 +0000

[release-branch.go1.13] cmd/compile: don't addLocalInductiveFacts if there is no direct edge from if block to phi block

Currently in addLocalInductiveFacts, we only check whether
direct edge from if block to phi block exists. If not, the
following logic will treat the phi block as the first successor,
which is wrong.

This patch makes prove pass more conservative, so we disable
some cases in test/prove.go. We will do some optimization in
the following CL and enable these cases then.

Fixes #40500.

Change-Id: I27cf0248f3a82312a6f7dabe11c79a1a34cf5412
Reviewed-on: https://go-review.googlesource.com/c/go/+/244579
Reviewed-by: Zach Jones <zachj1@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-on: https://go-review.googlesource.com/c/go/+/245957
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>