[Webkit-unassigned] [Bug 55158] Use VFP for double to int truncate in ARMv7

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=55158





--- Comment #9 from Gavin Barraclough <barraclough at apple.com>  2011-04-29 00:11:00 PST ---
Gah, I thought I'd checked all platforms before making my comment, I'd missed the extra clause on the ifdef in MIPS's supportsFloatingPoint.

Based on a little wikipedia research, the only chips toting MIPS I architecture appear to be over 20 years old, and run at under 100MHz.  If this understanding is correct, I doubt there are many users out there running the JSC JIT on these chips, and as such the performance benefit for having (some) FP enabled is unlikely to be significant!

As such, it doesn't seem unreasonable to unify the MIPS floating point support on:
    #if WTF_MIPS_DOUBLE_FLOAT && WTF_MIPS_ISA_AT_LEAST(2)
so that we can unify the supportsFloatingPoint & supportsFloatingPointTruncate methods.

Would be great to get some input from the mips folk to confirm that my understanding of the WTF_MIPS_ISA_AT_LEAST is correct, and that we would not be degrading the performance for real deployment uses.

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