[turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

[turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

The TruncateFloat64ToUint64 operator converts a float64 to an uint64 using
round-to-zero rounding mode (truncate). If the input value is outside uint64
range, then the result depends on the architecture. I provide an implementation for x64 and arm64.

@v8-ppc-ports and @v8-mips-ports, can you do the implementations for ppc64 and mips64?

R=titzer@chromium.org

Committed: https://crrev.com/f6e689cebbd2de36e2b38474f89b1ad37fbfbb0f
Cr-Commit-Position: refs/heads/master@{#32127}

[ahaas, 2015-11-19 18:16:02]

Description was changed from

==========
[turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

The TruncateFloat64ToUint64 operator converts a float64 to an uint64 using
round-to-zero rounding mode (truncate). If the input value is outside uint64
range, then the result depends on the architecture.

R=titzer@chromium.org
==========

to

==========
[turbofan] Implemented the TruncateFloat64ToUint64 TurboFan operator.

The TruncateFloat64ToUint64 operator converts a float64 to an uint64 using
round-to-zero rounding mode (truncate). If the input value is outside uint64
range, then the result depends on the architecture. I provide an implementation
for x64 and arm64.

@v8-ppc-ports and @v8-mips-ports, can you do the implementations for ppc64 and
mips64?

R=titzer@chromium.org
==========

[titzer, 2015-11-19 19:41:10]

lgtm

https://codereview.chromium.org/1457373002/diff/1/src/compiler/x64/code-gener...
File src/compiler/x64/code-generator-x64.cc (right):

https://codereview.chromium.org/1457373002/diff/1/src/compiler/x64/code-gener...
src/compiler/x64/code-generator-x64.cc:1044: // input value was not within the
positive int64 range. We substract 2^64
/substract/subtract/

https://codereview.chromium.org/1457373002/diff/1/src/compiler/x64/code-gener...
src/compiler/x64/code-generator-x64.cc:1058: // successfully, but we still have
to undo the substruction we did
s/substruction/subtraction

[ahaas, 2015-11-19 20:15:24]

The CQ bit was checked by ahaas@chromium.org

[ahaas, 2015-11-19 20:15:25]

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/1457373002/#ps20001
(title: "Fixed typos.")

[commit-bot: I haz the power, 2015-11-19 20:15:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1457373002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1457373002/20001

[ahaas, 2015-11-19 20:16:23]

On 2015/11/19 at 19:41:10, titzer wrote:
> lgtm
> 
>
https://codereview.chromium.org/1457373002/diff/1/src/compiler/x64/code-gener...
> File src/compiler/x64/code-generator-x64.cc (right):
> 
>
https://codereview.chromium.org/1457373002/diff/1/src/compiler/x64/code-gener...
> src/compiler/x64/code-generator-x64.cc:1044: // input value was not within the
positive int64 range. We substract 2^64
> /substract/subtract/
> 
>
https://codereview.chromium.org/1457373002/diff/1/src/compiler/x64/code-gener...
> src/compiler/x64/code-generator-x64.cc:1058: // successfully, but we still
have to undo the substruction we did
> s/substruction/subtraction

Done

[commit-bot: I haz the power, 2015-11-19 20:42:10]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-19 20:42:32]

Patchset 2 (id:??) landed as
https://crrev.com/f6e689cebbd2de36e2b38474f89b1ad37fbfbb0f
Cr-Commit-Position: refs/heads/master@{#32127}