Subzero: Fix frame size for floating-point register out-args.

Subzero: Fix frame size for floating-point register out-args.

The code that calculates maximum out-arg stack space was neglecting the fact that on x86-64, the first N scalar floating-point arguments are passed through xmm registers, not the stack.  As a result, stack frames were sometimes larger than necessary.

BUG= none
R=jpp@chromium.org

Committed: https://gerrit.chromium.org/gerrit/gitweb?p=native_client/pnacl-subzero.git;a=commit;h=c577727f49d6f4ccdbf40e9fa527cf1c97f23a7a

[Jim Stichnoth, 2016-06-18 05:52:38]

Description was changed from

==========
Subzero: Fix frame size for floating-point register out-args.

BUG= none
==========

to

==========
Subzero: Fix frame size for floating-point register out-args.

The code that calculates maximum out-arg stack space was neglecting the fact
that on x86-64, the first N scalar floating-point arguments are passed through
xmm registers, not the stack.  As a result, stack frames were sometimes larger
than necessary.

BUG= none
==========

[Jim Stichnoth, 2016-06-18 07:11:43]

stichnot@chromium.org changed reviewers:
+ eholk@chromium.org, jpp@chromium.org, kschimpf@google.com, manasijm@google.com

[John, 2016-06-20 13:41:01]

lgtm

[Jim Stichnoth, 2016-06-20 13:46:10]

Description was changed from

==========
Subzero: Fix frame size for floating-point register out-args.

The code that calculates maximum out-arg stack space was neglecting the fact
that on x86-64, the first N scalar floating-point arguments are passed through
xmm registers, not the stack.  As a result, stack frames were sometimes larger
than necessary.

BUG= none
==========

to

==========
Subzero: Fix frame size for floating-point register out-args.

The code that calculates maximum out-arg stack space was neglecting the fact
that on x86-64, the first N scalar floating-point arguments are passed through
xmm registers, not the stack.  As a result, stack frames were sometimes larger
than necessary.

BUG= none
R=jpp@chromium.org

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

[Jim Stichnoth, 2016-06-20 13:46:12]

Committed patchset #1 (id:1) manually as
c577727f49d6f4ccdbf40e9fa527cf1c97f23a7a (presubmit successful).