commit 9ff0d205fd60cba6753a91f613b198ca2d67f04d
author Kevin Brodsky <kevin.brodsky@linaro.org> Mon Jan 11 13:43:31 2016 +0000
committer Roland Levillain <rpl@google.com> Thu Feb 25 16:26:13 2016 +0000
tree 86689672064d66d2c473045f934f948211ba0389
parent 950d063395c7cecbbe372fd607468018d661a35c

Optimizing: ARM64 negated bitwise operations simplification

Use negated instructions on ARM64 to replace [bitwise operation + not]
patterns, that is:
a & ~b (BIC)
a | ~b (ORN)
a ^ ~b (EON)

The simplification only happens if the Not is only used by the bitwise
operation. It does not happen if both inputs are Not's (this should be
handled by a generic simplification applying De Morgan's laws).

Change-Id: I0e112b23fd8b8e10f09bfeff5994508a8ff96e9c

compiler/optimizing/nodes.h

diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 4185b2f..c4764cc 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -1268,6 +1268,7 @@
 #define FOR_EACH_CONCRETE_INSTRUCTION_ARM64(M)
 #else
 #define FOR_EACH_CONCRETE_INSTRUCTION_ARM64(M)                          \
+  M(Arm64BitwiseNegatedRight, Instruction)                              \
   M(Arm64DataProcWithShifterOp, Instruction)                            \
   M(Arm64IntermediateAddress, Instruction)
 #endif