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_shared.h b/compiler/optimizing/instruction_simplifier_shared.h
index 2ea103a..371619f 100644
--- a/compiler/optimizing/instruction_simplifier_shared.h
+++ b/compiler/optimizing/instruction_simplifier_shared.h
@@ -59,6 +59,7 @@
size_t data_offset);
bool TryCombineVecMultiplyAccumulate(HVecMul* mul, InstructionSet isa);
+bool TryExtractVecArrayAccessAddress(HVecMemoryOperation* access, HInstruction* index);
} // namespace art