ARM: Port instr simplification of array accesses.

After changing the addressing mode for array accesses (in
https://android-review.googlesource.com/248406) the 'add'
instruction that calculates the base address for the array can be
shared across accesses to the same array.

Before https://android-review.googlesource.com/248406:
    add IP, r[Array], r[Index0], LSL #2
    ldr r0, [IP, #12]
    add IP, r[Array], r[Index1], LSL #2
    ldr r0, [IP, #12]

Before this CL:
    add IP. r[Array], #12
    ldr r0, [IP, r[Index0], LSL #2]
    add IP. r[Array], #12
    ldr r0, [IP, r[Index1], LSL #2]

After this CL:
    add IP. r[Array], #12
    ldr r0, [IP, r[Index0], LSL #2]
    ldr r0, [IP, r[Index1], LSL #2]

Link to the original optimization:
    https://android-review.googlesource.com/#/c/127310/

Test: Run ART test suite on Nexus 6.
Change-Id: Iee26f9a0a7ca46abb90e3f60d19d22dc8dee4d8f

1 files changed, 0 insertions, 26 deletions

diff --git a/compiler/optimizing/nodes_arm64.h b/compiler/optimizing/nodes_arm64.h
index 06b073c3e2..3f88717c2a 100644
--- a/compiler/optimizing/nodes_arm64.h
+++ b/compiler/optimizing/nodes_arm64.h
@@ -94,32 +94,6 @@ class HArm64DataProcWithShifterOp FINAL : public HExpression<2> {
 
 std::ostream& operator<<(std::ostream& os, const HArm64DataProcWithShifterOp::OpKind op);
 
-// This instruction computes an intermediate address pointing in the 'middle' of an object. The
-// result pointer cannot be handled by GC, so extra care is taken to make sure that this value is
-// never used across anything that can trigger GC.
-class HArm64IntermediateAddress FINAL : public HExpression<2> {
- public:
-  HArm64IntermediateAddress(HInstruction* base_address, HInstruction* offset, uint32_t dex_pc)
-      : HExpression(Primitive::kPrimNot, SideEffects::DependsOnGC(), dex_pc) {
-    SetRawInputAt(0, base_address);
-    SetRawInputAt(1, offset);
-  }
-
-  bool CanBeMoved() const OVERRIDE { return true; }
-  bool InstructionDataEquals(const HInstruction* other ATTRIBUTE_UNUSED) const OVERRIDE {
-    return true;
-  }
-  bool IsActualObject() const OVERRIDE { return false; }
-
-  HInstruction* GetBaseAddress() const { return InputAt(0); }
-  HInstruction* GetOffset() const { return InputAt(1); }
-
-  DECLARE_INSTRUCTION(Arm64IntermediateAddress);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(HArm64IntermediateAddress);
-};
-
 }  // namespace art
 
 #endif  // ART_COMPILER_OPTIMIZING_NODES_ARM64_H_