tree 0e737478beda7e0e4063a49738328a0bdfcb4e12
parent 837b64974977f615dd1f0662857b97536acdb4dd
author Agi Csaki <agicsaki@google.com> 1439513479 -0700
committer Agi Csaki <agicsaki@google.com> 1439513479 -0700

Optimizing String.Equals as an intrinsic (ARM64)

The fifth implementation of String.Equals.  I added an intrinsic
in ARM64 which is similar to the original java implementation
of String.equals: an instanceof check, null check, length check, and
reference equality check followed by a loop comparing strings four
characters at a time starting at the beginning of the string.

Interesting Benchmarking Values:

64 Bit Nexus 9:
	Intrinsic Short (1-5 Character) Strings: 40 ns
	Original Short (1-5 Character) Strings: 80 ns
	Intrinsic Very Long (1000+ Character) Strings: 1556 ns
	Original Very Long (1000+ Character) Strings: 4554 ns
	Intrinsic Non-String Argument: 15 ns
	Original Non-String Argument: 62 ns

Bug: 21481923
Change-Id: If37b399614c2250f52ac709a3b50c356419ca88a