code review 63650044: cmd/gc: handle variable initialization by block move in...

cmd/gc: handle variable initialization by block move in liveness

Any initialization of a variable by a block copy or block zeroing
or by multiple assignments (componentwise copying or zeroing
of a multiword variable) needs to emit a VARDEF. These cases were not.

Fixes issue 7205.

[rsc, 2014-02-14 03:45:14]

Hello iant (cc: golang-codereviews@googlegroups.com),

I'd like you to review this change to
https://code.google.com/p/go/

[rsc, 2014-02-14 03:45:20]

*** Submitted as https://code.google.com/p/go/source/detail?r=bc03ee8d688d ***

cmd/gc: handle variable initialization by block move in liveness

Any initialization of a variable by a block copy or block zeroing
or by multiple assignments (componentwise copying or zeroing
of a multiword variable) needs to emit a VARDEF. These cases were not.

Fixes issue 7205.

TBR=iant
CC=golang-codereviews
https://codereview.appspot.com/63650044

[gobot, 2014-02-14 09:29:47]

This CL appears to have broken the darwin-amd64-race-cheney builder.

[iant, 2014-02-14 15:47:56]

LGTM