ARM64: Optimize generated code for gaps

src/arm64/assembler-arm64.h

Index: src/arm64/assembler-arm64.h
diff --git a/src/arm64/assembler-arm64.h b/src/arm64/assembler-arm64.h
index 8774c09603bb035220f8fd843c69580a94e1100d..4771d1c6fa940468d20746466e966cc1381e300c 100644
--- a/src/arm64/assembler-arm64.h
+++ b/src/arm64/assembler-arm64.h
@@ -707,6 +707,15 @@ class MemOperand {
   // handle indexed modes.
   inline Operand OffsetAsOperand() const;
 
+  enum PairResult {
+    kNotPair,   // Can't use a pair instruction.
+    kPairAB,    // Can use a pair instruction (operandA has lower address).
+    kPairBA };  // Can use a pair instruction (operandB has lower address).

[ulan, 2014/06/04 09:28:19]

Nit: "};" should be in a separate line.

[vincent.belliard, 2014/06/09 10:31:15]

Done.

+  // Check if two MemOperand are consistent for stp/ldp use.
+  static PairResult AreConsistentForPair(const MemOperand& operandA,
+                                         const MemOperand& operandB,
+                                         int access_size_log2 = kXRegSizeLog2);
+
  private:
   Register base_;
   Register regoffset_;