[Webkit-unassigned] [Bug 84449] DFG JIT is not ARM EABI compatible

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=84449





--- Comment #2 from Gavin Barraclough <barraclough at apple.com>  2012-04-21 15:42:42 PST ---
Interesting, looking at the iOS developer docs, this may be a difference on iOS:

http://developer.apple.com/library/ios/#documentation/Xcode/Conceptual/iPhoneOSABIReference/Articles/ARMv6FunctionCallingConventions.html#//apple_ref/doc/uid/TP40009021-SW1

    * Large data types (larger than 4 bytes) are 4-byte aligned.

We don't want to have to duplicate all these method to have two signatures, I guess we could provide a set of wrappers on non-iOS ARM, but the cleanest approach may just be to fix the callOperation interface to align the arguments correctly.  If this degrades performance (by moving augments from registers to the stack) we can always change the order of args to functions affected to compensate.

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