[Webkit-unassigned] [Bug 26987] New: Add fast case for Math.floor(a / b) expressions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=26987

           Summary: Add fast case for Math.floor(a / b) expressions
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Enhancement
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: zherczeg at inf.u-szeged.hu


I have implemented a fast case for Math.floor(a / b) expression.

For this example:

var a = 8
Math.floor(a / 3)

the following code generated:

[   0] enter
[   1] mov               r-15, r0
[   4] mov               r4, r0
[   7] mov               r-15, r1
[  10] op_method_check
[  11] get_by_id         r4, r-10, floor(@id0)
[  19] mov               r5, r-10
  -- new byte codes start here
[  22] jneq_ptr          r4, r-1216737440, 6(->31)
[  26] op_math_floor     r4, r-15, r2, 10(->40)
  -- new byte codes end here
[  31] div               r6, r-15, r2
[  35] call              r4, r4, 2, 15
[  40] end               r4

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