[Webkit-unassigned] [Bug 44329] SH4 JIT SUPPORT

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=44329





--- Comment #27 from Gabor Loki <loki at webkit.org>  2010-10-15 04:56:30 PST ---
> We can work on 64-bit , after the 32-bit port is accepted.

There are not so much changes to get JSValue32_64 working (if you have a JSValue32 version).

> The common solution should work fine, but with our solution we reduce the number of instructions.

Well, we have to sacrifice some performance to have a common masm and jit. Unfortunately the same thing is true for each architecture.

> In the common code, there are a lot of branches and the offsets are known when linking.
> when branching to solwcase, the offset is not reachable, so we need to load it in the constantPool, otherwise there is no need. that's why I added in branch functions a parameter to check  if we need to load a constant or not.

On ARMv5 and below the situation is the same, there are lots of pc relative loads which read a pointer or a big number. There are only very few cases when we are able to encode a constant into an instruction (most of those constants appear in the arithmetic part of jit).

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