Range feedback for binary integer operations.

runtime/vm/assembler_arm64.cc

Index: runtime/vm/assembler_arm64.cc
diff --git a/runtime/vm/assembler_arm64.cc b/runtime/vm/assembler_arm64.cc
index e163e1d626ddfbbedcf37063647563f91d4e5f58..fa19776e001bf37d921758caf66150d38348e636 100644
--- a/runtime/vm/assembler_arm64.cc
+++ b/runtime/vm/assembler_arm64.cc
@@ -1133,6 +1133,50 @@ void Assembler::LoadTaggedClassIdMayBeSmi(Register result, Register object) {
 }
 
 
+void Assembler::ComputeRange(Register result,
+                             Register value,
+                             Register scratch,
+                             Label* not_mint) {
+  Label done, not_smi;
+  tsti(value, Immediate(kSmiTagMask));
+  b(&not_smi, NE);
+
+  AsrImmediate(scratch, value, 32);
+  LoadImmediate(result, ICData::kUint32Bit, PP);
+  cmp(scratch, Operand(1));
+  b(&done, EQ);
+
+  neg(scratch, scratch);
+  add(result, scratch, Operand(ICData::kInt32Bit));
+  cmp(scratch, Operand(1));
+  LoadImmediate(TMP, ICData::kInt64Bit, PP);
+  csel(result, result, TMP, LS);
+  b(&done);
+
+  Bind(&not_smi);
+  CompareClassId(value, kMintCid, PP);
+  b(not_mint, NE);
+
+  LoadImmediate(result, ICData::kInt64Bit, PP);
+  Bind(&done);
+}
+
+
+void Assembler::UpdateRangeFeedback(Register value,
+                                    intptr_t idx,
+                                    Register ic_data,
+                                    Register scratch1,
+                                    Register scratch2,
+                                    Label* miss) {
+  ComputeRange(scratch1, value, scratch2, miss);
+  ldr(scratch2, FieldAddress(ic_data, ICData::range_feedback_offset()), kWord);
+  orrw(scratch2,
+       scratch2,
+       Operand(scratch1, LSL, ICData::kBitsPerRangeFeedback * idx));
+  str(scratch2, FieldAddress(ic_data, ICData::range_feedback_offset()), kWord);
+}
+
+
 // Frame entry and exit.
 void Assembler::ReserveAlignedFrameSpace(intptr_t frame_space) {
   // Reserve space for arguments and align frame before entering