[JSC] Format the output of --reportTotalPhaseTimes=1 more nicely

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Robin Morisset]

Currently, here is an example of the output of --reportTotalPhaseTimes=1:
```
[B3] moveConstants total ms: 64.307583 max ms: 1.703167
[B3] lowerToAir total ms: 151.297782 max ms: 5.426375
[B3] generateToAir total ms: 1623.987166 max ms: 92.826750
[B3] simplifyCFG total ms: 11.760463 max ms: 1.088083
[B3] Air::lowerMacros total ms: 5.975679 max ms: 0.382000
```

There are two frustrating things here:
- The numbers are not aligned, so it is not visible at a glance which passes take 1 order of magnitude more than others
- everything is just tagged by [B3] even when they're actually Air, and passes are tagged in the same way as combination of passes (like generateToAir).

I propose a simple formatting change that would output it as follows:
```
total ms:   66.328 max ms:   2.283 [B3] moveConstants
total ms:  148.097 max ms:   5.361 [B3] lowerToAir
total ms: 1619.115 max ms:  96.307 [Total B3] generateToAir
total ms:   11.959 max ms:   1.185 [Air] simplifyCFG
total ms:    6.519 max ms:   0.697 [Air] Air::lowerMacros
```

I found this a lot more readable when trying to optimize parts of the FTL compiler.

[Robin Morisset]

Created attachment 452796 [details]
Patch

[Robin Morisset]

Created attachment 452798 [details]
Patch

Fix style nits.

[Saam Barati]

Comment on attachment 452798 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=452798&action=review

r=me. Nice

> Source/WTF/wtf/FixedWidthDouble.h:2
> + * Copyright (C) 2021 Apple Inc. All rights reserved.

2022

[EWS]

Committed r290290 (247614@main): <https://commits.webkit.org/247614@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 452798 [details].

[Radar WebKit Bug Importer]

<rdar://problem/89277242>