Reland of "Implement WASM big-endian support".

Reland of "Implement WASM big-endian support".

Reland of https://codereview.chromium.org/2034093002 (reverted by
https://codereview.chromium.org/2080153002).

Original commit message:
Implement WASM support on big-endian platforms. WASM has
an implicit requirement that it is running on little-endian
machine. We achieve WASM support on BE by keeping data
in memory in little-endian order, and changing data
endianness before storing to memory and after loading from
memory.

BUG=

Committed: https://crrev.com/77546feb8509999ec490dd0a5e6dc13bbd91f10b
Cr-Commit-Position: refs/heads/master@{#37373}

[ivica.bogosavljevic, 2016-06-20 11:50:18]

Description was changed from

==========
Reland of "Implement WASM big-endian support"

Reland of https://codereview.chromium.org/2034093002 (reverted by
https://codereview.chromium.org/2080153002)

Original commit message:
Implement WASM support on big-endian platforms. WASM has
an implicit requirement that it is running on little-endian
machine. We achieve WASM support on BE by keeping data
in memory in little-endian order, and changing data
endianness before storing to memory and after loading from
memory.


BUG=
==========

to

==========
Reland of "Implement WASM big-endian support".

Reland of https://codereview.chromium.org/2034093002 (reverted by
https://codereview.chromium.org/2080153002).

Original commit message:
Implement WASM support on big-endian platforms. WASM has
an implicit requirement that it is running on little-endian
machine. We achieve WASM support on BE by keeping data
in memory in little-endian order, and changing data
endianness before storing to memory and after loading from
memory.


BUG=
==========

[ivica.bogosavljevic, 2016-06-20 12:36:38]

ivica.bogosavljevic@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, balazs.kilvady@imgtec.com, jyan@ca.ibm.com,
titzer@chromium.org

[ivica.bogosavljevic, 2016-06-20 12:36:39]

PTAL

This CL fixes crashes on Chromebooks. I guess the reason for crash is that ARM
on chromebooks doesn't support unaligned memory access.

[john.yan, 2016-06-20 20:26:27]

lgtm

[ivica.bogosavljevic, 2016-06-21 06:53:48]

PTAL

ChangeEndianness wasn't working well on 32bit architectures, because 0xFFl << 48
on 32bit architectures is 0.

Nevertheless, in order to have all WASM tests passing on 32bit architectures, a
separate CL that fixes int64-lowering on big-endian will be posted

[ivica.bogosavljevic, 2016-06-23 11:04:24]

Reminder...

[john.yan, 2016-06-28 17:44:22]

jyan@ca.ibm.com changed reviewers:
+ bmeurer@chromium.org

[john.yan, 2016-06-28 17:44:22]

cc bmeurer@chromium.org, would you be able to help landing this one again
please?

[Benedikt Meurer, 2016-06-29 03:51:28]

Sure, LGTM.

[ivica.bogosavljevic, 2016-06-29 07:19:08]

The CQ bit was checked by ivica.bogosavljevic@imgtec.com to run a CQ dry run

[commit-bot: I haz the power, 2016-06-29 07:19:20]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-29 07:40:14]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-06-29 07:40:16]

Dry run: Try jobs failed on following builders:
  v8_win_nosnap_shared_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_win_nosnap_shared_rel_ng...)
  v8_win_nosnap_shared_rel_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_win_nosnap_shared_rel_ng...)

[ivica.bogosavljevic, 2016-06-29 08:06:26]

The CQ bit was checked by ivica.bogosavljevic@imgtec.com to run a CQ dry run

[commit-bot: I haz the power, 2016-06-29 08:06:32]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-29 08:24:47]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-06-29 08:24:48]

Dry run: This issue passed the CQ dry run.

[ivica.bogosavljevic, 2016-06-29 08:26:27]

The CQ bit was checked by ivica.bogosavljevic@imgtec.com

[ivica.bogosavljevic, 2016-06-29 08:26:27]

The patchset sent to the CQ was uploaded after l-g-t-m from jyan@ca.ibm.com
Link to the patchset: https://codereview.chromium.org/2083523002/#ps60001
(title: "Rebase to master")

[commit-bot: I haz the power, 2016-06-29 08:26:36]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-29 08:30:28]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-06-29 08:30:30]

Try jobs failed on following builders:
  v8_presubmit on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_presubmit/builds/18330)

[ivica.bogosavljevic, 2016-06-29 08:39:23]

Missing LGTM from an OWNER for these files:
    src/wasm/decoder.h
    src/wasm/encoder.h
    src/wasm/wasm-interpreter.cc

[titzer, 2016-06-29 08:41:11]

lgtm

[titzer, 2016-06-29 08:52:42]

The CQ bit was checked by titzer@chromium.org

[commit-bot: I haz the power, 2016-06-29 08:52:54]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-29 09:25:35]

Description was changed from

==========
Reland of "Implement WASM big-endian support".

Reland of https://codereview.chromium.org/2034093002 (reverted by
https://codereview.chromium.org/2080153002).

Original commit message:
Implement WASM support on big-endian platforms. WASM has
an implicit requirement that it is running on little-endian
machine. We achieve WASM support on BE by keeping data
in memory in little-endian order, and changing data
endianness before storing to memory and after loading from
memory.


BUG=
==========

to

==========
Reland of "Implement WASM big-endian support".

Reland of https://codereview.chromium.org/2034093002 (reverted by
https://codereview.chromium.org/2080153002).

Original commit message:
Implement WASM support on big-endian platforms. WASM has
an implicit requirement that it is running on little-endian
machine. We achieve WASM support on BE by keeping data
in memory in little-endian order, and changing data
endianness before storing to memory and after loading from
memory.


BUG=
==========

[commit-bot: I haz the power, 2016-06-29 09:25:36]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2016-06-29 09:26:41]

Description was changed from

==========
Reland of "Implement WASM big-endian support".

Reland of https://codereview.chromium.org/2034093002 (reverted by
https://codereview.chromium.org/2080153002).

Original commit message:
Implement WASM support on big-endian platforms. WASM has
an implicit requirement that it is running on little-endian
machine. We achieve WASM support on BE by keeping data
in memory in little-endian order, and changing data
endianness before storing to memory and after loading from
memory.


BUG=
==========

to

==========
Reland of "Implement WASM big-endian support".

Reland of https://codereview.chromium.org/2034093002 (reverted by
https://codereview.chromium.org/2080153002).

Original commit message:
Implement WASM support on big-endian platforms. WASM has
an implicit requirement that it is running on little-endian
machine. We achieve WASM support on BE by keeping data
in memory in little-endian order, and changing data
endianness before storing to memory and after loading from
memory.

BUG=

Committed: https://crrev.com/77546feb8509999ec490dd0a5e6dc13bbd91f10b
Cr-Commit-Position: refs/heads/master@{#37373}
==========

[commit-bot: I haz the power, 2016-06-29 09:26:42]

Patchset 4 (id:??) landed as
https://crrev.com/77546feb8509999ec490dd0a5e6dc13bbd91f10b
Cr-Commit-Position: refs/heads/master@{#37373}

[john.yan, 2016-06-29 13:14:32]

On 2016/06/29 08:41:11, titzer wrote:
> lgtm

Thank you!