RFR: 8144028: Use AArch64 bit-test instructions in C2

Andrew Haley aph at redhat.com
Wed Nov 25 15:49:28 UTC 2015

For some reason (oversight, I guess) we never got around to using the
bit-testing AArch64 instructions in C2.  TBZ/TBNZ are quite nice in
that they allow bit tests and branches (and tests for +ve/-ve) without
hitting the condition codes.  TST sets the condition codes based on a
set of bits in a register: it's an AND which throws the result away.



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