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cmd/gc: Optimizer bug involving constants, bit shifts and []byte literals #5809

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gopherbot opened this issue Jun 28, 2013 · 5 comments
Closed

cmd/gc: Optimizer bug involving constants, bit shifts and []byte literals #5809

gopherbot opened this issue Jun 28, 2013 · 5 comments
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Go1.1.2

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@gopherbot
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by micah.stetson:

What steps will reproduce the problem?
Run this program in the playground: http://play.golang.org/p/cWZcknG23D

What is the expected output?
1234
234

What do you see instead?
1111
222

Which compiler are you using (5g, 6g, 8g, gccgo)?
6g

Which operating system are you using?
Mac OS X 10.7.5 and also the Go Playground

Which version are you using?  (run 'go version')
Tried with go 1.1 and go 1.1.1

Please provide any additional information below.

Disabling optimization with go build -gcflags -N makes the problem go away. So do any
number of source-level changes.
@ianlancetaylor
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Comment 1:

Labels changed: added priority-soon, go1.1.2, removed priority-triage.

@ianlancetaylor
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Comment 2:

Labels changed: added compilerbug.

@DanielMorsing
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Comment 3:

Fix at https://golang.org/cl/10785043

Owner changed to @DanielMorsing.

Status changed to Started.

@DanielMorsing
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Comment 4:

This issue was closed by revision 3c3ce8e.

Status changed to Fixed.

@adg
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adg commented Jul 22, 2013

Comment 5:

This issue was closed by revision 3f654997fdd6.

@rsc rsc added this to the Go1.1.2 milestone Apr 14, 2015
@rsc rsc removed the go1.1.2 label Apr 14, 2015
adg added a commit that referenced this issue May 11, 2015
@adg
[release-branch.go1.1] cmd/6g, cmd/8g: prevent constant propagation o…
9db29c2 
…f non-constant LEA.

««« CL 10785043 / cf792c00f410
cmd/6g, cmd/8g: prevent constant propagation of non-constant LEA.

Fixes #5809.

R=golang-dev, dave, rsc, nigeltao
CC=golang-dev
https://golang.org/cl/10785043
»»»

Update #5928

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/11515045
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@rsc @DanielMorsing @ianlancetaylor @adg @gopherbot