cmd/internal/obj/x86: fix POPCNT instruction

[gopherbot]

by rayneolivetti:

Before filing a bug, please check whether it has been fixed since the
latest release. Search the issue tracker and check that you're running the
latest version of Go:

Run "go version" and compare against
http://golang.org/doc/devel/release.html  If a newer version of Go exists,
install it and retry what you did to reproduce the problem.

Thanks.

What steps will reproduce the problem?
If possible, include a link to a program on play.golang.org.
1. Try feeding a popcnt instruction to 6a
2.
3.

What is the expected output?


What do you see instead?
Unknown instruction error

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

Which operating system are you using?
Arch Linux

Which version are you using?  (run 'go version')
go version go1.0.3

Please provide any additional information below.

[minux]

Comment 1:

feel free to propose CL for this (an example is:
http://golang.org/cl/5970055)
for now, you could use something like this:
#define POPCNT_AX_AX BYTE $0xf3; BYTE $0x48; BYTE $0x0f; BYTE $0xb8; BYTE $0xc0

Labels changed: added priority-someday, removed priority-triage, go1.1maybe.

Status changed to Accepted.

[rsc]

Comment 2:

Labels changed: added go1.2maybe.

[rsc]

Comment 3:

Labels changed: added feature.

[robpike]

Comment 4:

Labels changed: added go1.3maybe, removed go1.2maybe.

[robpike]

Comment 5:

Labels changed: removed go1.3maybe.

[rsc]

Comment 6:

Labels changed: added repo-main.

[robpike]

Comment 7:

Issue #7357 has been merged into this issue.

[rsc]

Comment 8:

Adding Release=None to all Priority=Someday bugs.

Labels changed: added release-none.