Status: Accepted
Owner: [email protected]
Labels: Type-Bug Priority-Medium HW-x64
New issue 1059 by [email protected]: x64: Rewrite LGapResolver
http://code.google.com/p/v8/issues/detail?id=1059
In SVN revision 6344 the gap resolver for IA32 was changed.
The x64 gap resolver is using the old-style implementation. It appears to
suffer from issue 1033 (using register xmm0 for both resolving cycles and
for memory-to-memory moves). It also spills rax right before a
memory-to-memory move and then restores eagerly afterward. This strategy
is bad when there are multiple memory-to-memory moves.
At a minimum, these issues need to be fixed. The whole class could be
restructured to follow a similar depth-first strategy to the IA32. The
strategy could be tweaked to take advantage of having a general-purpose
scratch register available.
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