[Webkit-unassigned] [Bug 30144] MIPS JIT Supports

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=30144





--- Comment #28 from Chao-ying Fu <fu at mips.com>  2009-11-06 10:40:01 PDT ---
(In reply to comment #27)
> Just a quick warning, we're now specified that the MacroAssembler shift methods
> must clamp the shift amount to the range 0..31 - see
> http://trac.webkit.org/changeset/50595 .
> 
> On x86 this requires no additional code, since the operand to the shift is
> implicitly clamped to this range.  On the ARM platforms we plant an extra arm
> instruction – I don't know what the specified behaviour is on MIPS, you may
> need to do the same?

On MIPS, the shift amount is clamped into 0..31 (from bit 0 to bit 4 of a rs
register) automatically.  So, no extra code is required.  Thanks!

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