Range feedback for binary integer operations.

runtime/vm/assembler_mips.cc

Index: runtime/vm/assembler_mips.cc
diff --git a/runtime/vm/assembler_mips.cc b/runtime/vm/assembler_mips.cc
index 811023dcd9298d1c7dfdb40292a22a4b54e0fa6f..fa6c81eda6ecfd6a7e7b0c6ee1d1642fa9108ca0 100644
--- a/runtime/vm/assembler_mips.cc
+++ b/runtime/vm/assembler_mips.cc
@@ -702,6 +702,51 @@ void Assembler::LoadTaggedClassIdMayBeSmi(Register result, Register object) {
 }
 
 
+void Assembler::ComputeRange(Register result,
+                             Register value,
+                             Label* miss) {
+  const Register hi = TMP;
+  const Register lo = CMPRES2;
+
+  Label done;
+  srl(result, value, kBitsPerWord - 1);
+  andi(CMPRES1, value, Immediate(kSmiTagMask));
+  beq(CMPRES1, ZR, &done);
+
+  LoadClassId(CMPRES1, value);
+  BranchNotEqual(CMPRES1, Immediate(kMintCid), miss);
+  LoadFieldFromOffset(hi, value, Mint::value_offset() + kWordSize);
+  LoadFieldFromOffset(lo, value, Mint::value_offset());
+  sra(lo, lo, kBitsPerWord - 1);
+
+  LoadImmediate(result, ICData::kInt32Bit);
+
+  beq(hi, lo, &done);
+  delay_slot()->subu(result, result, hi);
+
+  beq(hi, ZR, &done);
+  delay_slot()->addiu(result, ZR, Immediate(ICData::kUint32Bit));
+  LoadImmediate(result, ICData::kInt64Bit);
+  Bind(&done);
+}
+
+
+void Assembler::UpdateRangeFeedback(Register value,
+                                    intptr_t index,
+                                    Register ic_data,
+                                    Register scratch,
+                                    Label* miss) {
+  ASSERT(ICData::IsValidRangeFeedbackIndex(index));
+  ComputeRange(scratch, value, miss);
+  LoadFieldFromOffset(TMP, ic_data, ICData::range_feedback_offset());
+  if (index != 0) {
+    sll(scratch, scratch, ICData::kBitsPerRangeFeedback * index);
+  }
+  or_(TMP, TMP, scratch);
+  StoreFieldToOffset(TMP, ic_data, ICData::range_feedback_offset());
+}
+
+
 void Assembler::EnterFrame() {
   ASSERT(!in_delay_slot_);
   addiu(SP, SP, Immediate(-2 * kWordSize));