[wasm]implement simd lowering for f32x4->i32x4, i32x4 min/max and shift instructions

[wasm]implement simd lowering for f32x4->i32x4, i32x4 min/max and shift instructions

BUG=v8:4124
R=bradnelson@chromium.org,bbudge@chromium.org,gdeepti@chromium.org,mtrofin@chromium.org,titzer@chromium.org

Review-Url: https://codereview.chromium.org/2718323003
Cr-Commit-Position: refs/heads/master@{#43510}
Committed: https://chromium.googlesource.com/v8/v8/+/f75748cf4ca696fff268787068419604815f8090

[aseemgarg, 2017-02-28 13:47:10]

The CQ bit was checked by aseemgarg@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-02-28 13:47:20]

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, 2017-02-28 14:11:43]

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

[commit-bot: I haz the power, 2017-02-28 14:11:44]

Dry run: This issue passed the CQ dry run.

[titzer, 2017-03-01 09:40:29]

lgtm with nits

https://codereview.chromium.org/2718323003/diff/1/src/compiler/simd-scalar-lo...
File src/compiler/simd-scalar-lowering.cc (right):

https://codereview.chromium.org/2718323003/diff/1/src/compiler/simd-scalar-lo...
src/compiler/simd-scalar-lowering.cc:123: default: {
Probably time for an innner switch now?

https://codereview.chromium.org/2718323003/diff/1/src/compiler/simd-scalar-lo...
src/compiler/simd-scalar-lowering.cc:318: //    if
(!machine()->Float32RoundTruncate().IsSupported()) {
Is this code ncessary? if not, then please remove it.

[aseemgarg, 2017-03-01 10:55:16]

https://codereview.chromium.org/2718323003/diff/1/src/compiler/simd-scalar-lo...
File src/compiler/simd-scalar-lowering.cc (right):

https://codereview.chromium.org/2718323003/diff/1/src/compiler/simd-scalar-lo...
src/compiler/simd-scalar-lowering.cc:123: default: {
On 2017/03/01 09:40:28, titzer wrote:
> Probably time for an innner switch now?

Done.

https://codereview.chromium.org/2718323003/diff/1/src/compiler/simd-scalar-lo...
src/compiler/simd-scalar-lowering.cc:318: //    if
(!machine()->Float32RoundTruncate().IsSupported()) {
On 2017/03/01 09:40:28, titzer wrote:
> Is this code ncessary? if not, then please remove it.

Removed. All bots are passing with this commented out.

[aseemgarg, 2017-03-01 11:13:42]

The CQ bit was checked by aseemgarg@chromium.org

[aseemgarg, 2017-03-01 11:13:42]

The patchset sent to the CQ was uploaded after l-g-t-m from titzer@chromium.org
Link to the patchset: https://codereview.chromium.org/2718323003/#ps20001
(title: "comments")

[commit-bot: I haz the power, 2017-03-01 11:13:51]

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, 2017-03-01 11:39:11]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1488366822473640,
"parent_rev": "a727f9e8c0c8c9984961e1a755a6921122907034", "commit_rev":
"f75748cf4ca696fff268787068419604815f8090"}

[commit-bot: I haz the power, 2017-03-01 11:39:15]

Description was changed from

==========
[wasm]implement simd lowering for f32x4->i32x4, i32x4 min/max and shift
instructions

BUG=v8:4124
R=bradnelson@chromium.org,bbudge@chromium.org,gdeepti@chromium.org,mtrofin@ch...
==========

to

==========
[wasm]implement simd lowering for f32x4->i32x4, i32x4 min/max and shift
instructions

BUG=v8:4124
R=bradnelson@chromium.org,bbudge@chromium.org,gdeepti@chromium.org,mtrofin@ch...

Review-Url: https://codereview.chromium.org/2718323003
Cr-Commit-Position: refs/heads/master@{#43510}
Committed:
https://chromium.googlesource.com/v8/v8/+/f75748cf4ca696fff268787068419604815...
==========

[commit-bot: I haz the power, 2017-03-01 11:39:16]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/v8/v8/+/f75748cf4ca696fff268787068419604815...

[Michael Achenbach, 2017-03-01 12:39:31]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/2723943003/ by machenbach@chromium.org.

The reason for reverting is: breaks nosse4:
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20debug/builds....

[ahaas, 2017-03-01 12:39:51]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/2725853002/ by ahaas@chromium.org.

The reason for reverting is: There is a crash on a bot
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20debug/builds....