By now only the default %TypedArray%.prototype.sort compare function
and the JS implementation of SameValueZero were still using the odd
%_IsMinusZero intrinsic, whose semantics both included a number check
(actually HeapNumber test) plus testing if the heap number stores the
special -0 value. In both cases we already know that we deal with
number so we can reduce it to a simple number test for -0, which can
be expressed via dividing 1 by that value and checking the sign of
the result. In case of the compare function, we can be even smarter
and work with the reciprocal values in case x and y are equal to 0
(although long term we should probably rewrite the fast case for
the typed array sorting function in C++ anyway, which will be way,
way faster than our handwritten callback-style, type-feedback
polluted JS implementation).
R=yangguo@chromium.org
Review URL: https://codereview.chromium.org/1680783002
Cr-Commit-Position: refs/heads/master@{#33833}
There's no point in having %_IsFunction as inline intrinsic, as it
is only used in non performance critical code, which is already full
of runtime calls anyway, so %IsFunction will do the trick as well.
R=yangguo@chromium.org
Review URL: https://codereview.chromium.org/1658123002
Cr-Commit-Position: refs/heads/master@{#33660}
%_IsObject(foo) is equivalent to typeof foo === 'object' and has
exactly the same optimizations, so there's zero need for %_IsObject
in our code base.
R=mstarzinger@chromium.org
Review URL: https://codereview.chromium.org/1313903003
Cr-Commit-Position: refs/heads/master@{#30380}
