ARM64: Share address computation across SIMD LDRs/STRs.
For array accesses the element address has the following structure:
Address = CONST_OFFSET + base_addr + index << ELEM_SHIFT
Taking into account ARM64 LDR/STR addressing modes address part
(CONST_OFFSET + index << ELEM_SHIFT) can be shared across array
access with the same data type and index.
For example, for the following loop 5 accesses can share address
computation:
void foo(int[] a, int[] b, int[] c) {
for (i...) {
a[i] = a[i] + 5;
b[i] = b[i] + c[i];
}
}
Test: test-art-host, test-art-target
Change-Id: I46af3b4e4a55004336672cdba3296b7622d815ca
diff --git a/compiler/optimizing/instruction_simplifier_arm64.cc b/compiler/optimizing/instruction_simplifier_arm64.cc
index f16e372..311be1f 100644
--- a/compiler/optimizing/instruction_simplifier_arm64.cc
+++ b/compiler/optimizing/instruction_simplifier_arm64.cc
@@ -216,5 +216,18 @@
}
}
+void InstructionSimplifierArm64Visitor::VisitVecLoad(HVecLoad* instruction) {
+ if (!instruction->IsStringCharAt()
+ && TryExtractVecArrayAccessAddress(instruction, instruction->GetIndex())) {
+ RecordSimplification();
+ }
+}
+
+void InstructionSimplifierArm64Visitor::VisitVecStore(HVecStore* instruction) {
+ if (TryExtractVecArrayAccessAddress(instruction, instruction->GetIndex())) {
+ RecordSimplification();
+ }
+}
+
} // namespace arm64
} // namespace art