Commit ce68047f authored by Keith Randall's avatar Keith Randall Committed by Andrew Bonventre
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[release-branch.go1.9] cmd/compile: fix constant folding of right shifts 

The sub-word shifts need to sign-extend before shifting, to avoid
bringing in data from higher in the argument.

Fixes #23812

Change-Id: I0a95a0b49c48f3b40b85765bb4a9bb492be0cd73
Reviewed-on: https://go-review.googlesource.com/93716


Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: default avatarCherry Zhang <cherryyz@google.com>
Reviewed-on: https://go-review.googlesource.com/102775
Run-TryBot: Andrew Bonventre <andybons@golang.org>
parent 6732fcc0
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