Range feedback for binary integer operations.

runtime/vm/assembler_ia32.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_IA32)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/cpu.h"
@@ skipping 1479 matching lines @@
 }
 
 
 void Assembler::orl(Register dst, const Address& address) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x0B);
   EmitOperand(dst, address);
 }
 
 
+void Assembler::orl(const Address& address, Register reg) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x09);
+  EmitOperand(reg, address);
+}
+
+
 void Assembler::xorl(Register dst, Register src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x33);
   EmitOperand(dst, Operand(src));
 }
 
 
 void Assembler::xorl(Register dst, const Immediate& imm) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitComplex(6, Operand(dst), imm);
@@ skipping 1401 matching lines @@
   // If the object is not a Smi, use the original object to load the cid.
   // Otherwise, the dummy object is used, and the result is kSmiCid.
   cmovne(result, object);
   LoadClassId(result, result);
 
   // Tag the result.
   SmiTag(result);
 }
 
 
+void Assembler::ComputeRange(Register result,
+                             Register value,
+                             Register lo_temp,
+                             Register hi_temp,
+                             Label* not_mint) {
+  Label done;
+  movl(result, value);
+  shrl(result, Immediate(kBitsPerWord - 1));  // Sign bit.
+  testl(value, Immediate(kSmiTagMask));
+  j(ZERO, &done, Assembler::kNearJump);
+  CompareClassId(value, kMintCid, result);
+  j(NOT_EQUAL, not_mint);
+  movl(lo_temp, FieldAddress(value, Mint::value_offset()));
+  movl(hi_temp, FieldAddress(value, Mint::value_offset() + kWordSize));
+  movl(result, Immediate(ICData::kInt32RangeBit));
+  subl(result, hi_temp);  // 10 (positive int32), 11 (negative int32)
+  sarl(lo_temp, Immediate(kBitsPerWord - 1));
+  cmpl(lo_temp, hi_temp);
+  j(EQUAL, &done, Assembler::kNearJump);
+  movl(result, Immediate(ICData::kUint32RangeBit));  // Uint32
+  cmpl(hi_temp, Immediate(0));
+  j(EQUAL, &done, Assembler::kNearJump);
+  movl(result, Immediate(ICData::kInt64RangeBit));  // Int64
+  Bind(&done);
+}
+
+
+void Assembler::UpdateRangeFeedback(Register value,
+                                    intptr_t index,
+                                    Register ic_data,
+                                    Register scratch1,
+                                    Register scratch2,
+                                    Register scratch3,
+                                    Label* miss) {
+  ASSERT(ICData::IsValidRangeFeedbackIndex(index));
+  ComputeRange(scratch1, value, scratch2, scratch3, miss);
+  if (index != 0) {
+    shll(scratch1, Immediate(ICData::kBitsPerRangeFeedback * index));
+  }
+  orl(FieldAddress(ic_data, ICData::range_feedback_offset()), scratch1);
+}
+
+
 Address Assembler::ElementAddressForIntIndex(bool is_external,
                                              intptr_t cid,
                                              intptr_t index_scale,
                                              Register array,
                                              intptr_t index) {
   if (is_external) {
     return Address(array, index * index_scale);
   } else {
     const int64_t disp = static_cast<int64_t>(index) * index_scale +
         Instance::DataOffsetFor(cid);
@@ skipping 55 matching lines @@
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfXmmRegisters));
   return xmm_reg_names[reg];
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32