[aarch64-port-dev ] RFR(S): 8237524: AArch64: String.compareTo() may return incorrect result

[Andrew Haley]

On 1/21/20 8:40 AM, Pengfei Li wrote:
> Root cause is in the AArch64 String.compareTo intrinsics. In the code of
> MacroAssembler::string_compare(), we have a fast path that compares the
> addresses of initial bytes of the two arrays. If the result is equal, we
> skip the inflation of the Latin one and the byte-wise comparison part.
> But we shouldn't do in this way if the encodings of the two strings are
> different (the LU/UL cases). This patch removes the incorrect fast path
> check.

Is this really a bug? The test case is violating the protections
provided by the Java runtime, and the programmer deserves everything
that happens.

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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