ART: Generalize "x >> (s & m)" simplification.
Extend the simplification from
x SHIFT (s & mask), mask contains relevant bits
where SHIFT is Shl/Shr/UShr/Ror to
x SHIFT (s | mask), mask does not contain relevant bits,
x SHIFT (s ^ mask), mask does not contain relevant bits,
x SHIFT (s + mask), mask does not contain relevant bits,
x SHIFT (s - mask), mask does not contain relevant bits,
x SHIFT ((type)s), s is non-64-bit integral type.
The simplification for the TypeConversion case is motivated
by the work to introduce Uint8 and convert '& 0xff' to
TypeConversion. This CL makes sure the old simplifications
shall still work. The simplifications for Or/Xor/Add/Sub
are added just because we can.
Test: Add tests to 548-checker-instruct-simplification.
Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 23964345
Change-Id: I71210cb63496fae607a457a627f115260669c2c9
2 files changed