RFR: 8151439: Inline the BitMap constructor

[Per Liden]

Looks good!

/Per

On 2016-03-08 11:52, Stefan Karlsson wrote:
> Hi all,
>
> Please review this patch to inline the BitMap constructor. This will
> allow us to efficiently use temporary, stack-allocated BitMaps.
>
> http://cr.openjdk.java.net/~stefank/8151439/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8151439
>
> A code example of why we want to inline the BitMap constructor:
> void MyClass::set_bit(idx_t x) {
>      BitMap(&_bits, BitsPerWord).par_set_bit(x).
> }
>
> We could have used an instance of a BitMap in MyClass, but that would
> store both a bm_word_t* and the size of the bitmap storage in MyClass.
> Since the size is a compile-time constant, we can use the above
> construct to only store a bm_word_t field in MyClass, and thereby reduce
> the size of MyClass. By inlining the constructor, we get rid of the
> extra overhead of creating a BitMap.
>
> Thanks,
> StefanK