Subzero. ARM32. Implements the Availability Optimization.

Subzero. ARM32. Implements the Availability Optimization.

Implements the Availability optimization:

a = b
x = f(a, c)

becomes

a = b
x = f(b, c)

This only triggers if b is an infinite-weight temporary, and it
prevents a potential spill at the cost of higher register pressure.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4076
R=stichnot@chromium.org

Committed: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-subzero.git;a=commit;h=562233c890ea6d2a834962edf3ccf9db14356683

[John, 2015-10-27 20:52:00]

jpp@chromium.org changed reviewers:
+ kschimpf@google.com, sehr%chromium.org@gtempaccount.com, stichnot@chromium.org

[Jim Stichnoth, 2015-10-27 21:41:53]

Description was changed from

==========
Subzero. ARM32. Implements the Availability Optimization.

Implements the Availability optimization:

a = b
x = f(a, c)

becomes

a = b
x = f(b, c)

This only triggers if b is an infinite-weight temporary, and it
prevents a potential spill at the cost of higher register pressure.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4076
==========

to

==========
Subzero. ARM32. Implements the Availability Optimization.

Implements the Availability optimization:

a = b
x = f(a, c)

becomes

a = b
x = f(b, c)

This only triggers if b is an infinite-weight temporary, and it
prevents a potential spill at the cost of higher register pressure.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4076
==========

[Jim Stichnoth, 2015-10-27 21:41:53]

stichnot@chromium.org changed reviewers:
+ sehr@chromium.org
- sehr%chromium.org@gtempaccount.com

[Jim Stichnoth, 2015-10-27 21:45:51]

lgtm

[John, 2015-10-28 12:48:03]

Committed patchset #1 (id:1) manually as
562233c890ea6d2a834962edf3ccf9db14356683 (presubmit successful).