FTL: Optimize IsString(@2<String>) -> JSConst(true) + Phantom()

[Nadav Rotem]

FTL: Optimize IsString(@2<String) -> JSConst(true) + Phantom()

[Nadav Rotem]

Created attachment 213424 [details]
Patch

[Darin Adler]

Comment on attachment 213424 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=213424&action=review

> Source/JavaScriptCore/dfg/DFGFixupPhase.cpp:894
> +        case IsString: {
> +            if (node->child1().useKind() == StringUse) {
> +                m_insertionSet.insertNode(m_indexInBlock, SpecNone, Phantom, node->codeOrigin,
> +                    Edge(node->child1().node(), StringUse));
> +                node->convertToConstant(1);
> +                break;
> +            }
> +        }

While I am not qualified to review this, I do have two small style comments: We should break rather than falling through at the end of this case. Also, there is no need for the outer braces around the if statement, so please remove them.

[Nadav Rotem]

Created attachment 213426 [details]
Patch

[Nadav Rotem]

Created attachment 213617 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 213617 [details]
Patch

Clearing flags on attachment: 213617

Committed r157059: <http://trac.webkit.org/changeset/157059>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.