Range feedback for binary integer operations.

runtime/vm/assembler_mips.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/longjump.h"
 #include "vm/runtime_entry.h"
@@ skipping 684 matching lines @@
   andi(CMPRES1, object, Immediate(kSmiTagMask));
   if (result != object) {
     mov(result, object);
   }
   movz(result, TMP, CMPRES1);
   LoadClassId(result, result);
   SmiTag(result);
 }
 
 
+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::kInt32RangeBit);
+
+  beq(hi, lo, &done);
+  delay_slot()->subu(result, result, hi);
+
+  beq(hi, ZR, &done);
+  delay_slot()->addiu(result, ZR, Immediate(ICData::kUint32RangeBit));
+  LoadImmediate(result, ICData::kInt64RangeBit);
+  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));
   sw(RA, Address(SP, 1 * kWordSize));
   sw(FP, Address(SP, 0 * kWordSize));
   mov(FP, SP);
 }
 
 
 void Assembler::LeaveFrameAndReturn() {
@@ skipping 513 matching lines @@
     Emit(reinterpret_cast<int32_t>(message));
     Bind(&msg);
     break_(Instr::kSimulatorMessageCode);
   }
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS