Add fast Smi op version of switchable instance calls.

runtime/vm/stub_code_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/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 2193 matching lines @@
   const Register temp2 = T3;
   const Register left = T1;
   const Register right = T0;
   __ lw(left, Address(SP, 1 * kWordSize));
   __ lw(right, Address(SP, 0 * kWordSize));
   GenerateIdenticalWithNumberCheckStub(assembler, left, right, temp1, temp2);
   __ Ret();
 }
 
 
+// Called from megamorphic calls.
+//  T0: receiver
+//  S5: MegamorphicCache (preserved)
+// Result:
+//  T1: target entry point
+//  CODE_REG: target Code
+//  S4: arguments descriptor
 void StubCode::EmitMegamorphicLookup(Assembler* assembler) {
   __ LoadTaggedClassIdMayBeSmi(T0, T0);
   // T0: class ID of the receiver (smi).
   __ lw(S4, FieldAddress(S5, MegamorphicCache::arguments_descriptor_offset()));
   __ lw(T2, FieldAddress(S5, MegamorphicCache::buckets_offset()));
   __ lw(T1, FieldAddress(S5, MegamorphicCache::mask_offset()));
   // T2: cache buckets array.
   // T1: mask.
   __ mov(T3, T0);
   // T3: probe.
@@ skipping 22 matching lines @@
   // be invoked as a normal Dart function.
   __ sll(T1, T3, 2);
   __ addu(T1, T2, T1);
   __ lw(T0, FieldAddress(T1, base + kWordSize));
 
   __ lw(T1, FieldAddress(T0, Function::entry_point_offset()));
   __ lw(CODE_REG, FieldAddress(T0, Function::code_offset()));
 }
 
 
-// Called from megamorphic calls.
-//  T0: receiver
-//  S5: MegamorphicCache (preserved)
-// Result:
-//  T1: target entry point
-//  CODE_REG: target Code
-//  S4: arguments descriptor
 void StubCode::GenerateMegamorphicLookupStub(Assembler* assembler) {
   EmitMegamorphicLookup(assembler);
   __ Ret();
 }
 
 
 // Called from switchable IC calls.
 //  T0: receiver
 //  S5: ICData (preserved)
 // Result:
 //  T1: target entry point
 //  CODE_REG: target Code object
 //  S4: arguments descriptor
-void StubCode::GenerateICLookupStub(Assembler* assembler) {
+static void EmitICLookup(Assembler* assembler,
+                         intptr_t args_checked,
+                         Token::Kind kind) {
+  if (kind != Token::kILLEGAL) {
+    __ Comment("Fast Smi op");
+    Label not_smi_or_overflow;
+
+    // T0: Receiver.
+    __ lw(T1, Address(SP, 0 * kWordSize));
+    // T1: Argument.
+    __ or_(CMPRES1, T0, T1);
+    __ andi(CMPRES1, CMPRES1, Immediate(kSmiTagMask));
+    __ bne(CMPRES1, ZR, &not_smi_or_overflow);
+
+    switch (kind) {
+      case Token::kADD: {
+        __ AdduDetectOverflow(V0, T1, T0, CMPRES1);  // Add.
+        __ bltz(CMPRES1, &not_smi_or_overflow);  // Fall through on overflow.
+        break;
+      }
+      case Token::kSUB: {
+        __ SubuDetectOverflow(V0, T1, T0, CMPRES1);  // Subtract.
+        __ bltz(CMPRES1, &not_smi_or_overflow);  // Fall through on overflow.
+        break;
+      }
+      case Token::kEQ: {
+        Label true_label, done;
+        __ beq(T1, T0, &true_label);
+        __ LoadObject(V0, Bool::False());
+        __ b(&done);
+        __ Bind(&true_label);
+        __ LoadObject(V0, Bool::True());
+        __ Bind(&done);
+        break;
+      }
+      default: UNIMPLEMENTED();
+    }
+    // Return past the call to lookup result and delay slot.
+    __ addiu(RA, RA, Immediate(2 * Instr::kInstrSize));
+    __ Ret();
+
+    __ Bind(&not_smi_or_overflow);
+  }
+
   Label loop, found, miss;
   __ lw(T6, FieldAddress(S5, ICData::ic_data_offset()));
   __ lw(S4, FieldAddress(S5, ICData::arguments_descriptor_offset()));
   __ AddImmediate(T6, T6, Array::data_offset() - kHeapObjectTag);
   // T6: first IC entry.
   __ LoadTaggedClassIdMayBeSmi(T1, T0);
   // T1: receiver cid as Smi
 
   __ Bind(&loop);
   __ lw(T2, Address(T6, 0));
   __ beq(T1, T2, &found);
   ASSERT(Smi::RawValue(kIllegalCid) == 0);
   __ beq(T2, ZR, &miss);
 
-  const intptr_t entry_length = ICData::TestEntryLengthFor(1) * kWordSize;
+  const intptr_t entry_length =
+      ICData::TestEntryLengthFor(args_checked) * kWordSize;
   __ AddImmediate(T6, entry_length);  // Next entry.
   __ b(&loop);
 
   __ Bind(&found);
-  const intptr_t target_offset = ICData::TargetIndexFor(1) * kWordSize;
+  const intptr_t target_offset =
+      ICData::TargetIndexFor(args_checked) * kWordSize;
   __ lw(T0, Address(T6, target_offset));
   __ lw(T1, FieldAddress(T0, Function::entry_point_offset()));
   __ lw(CODE_REG, FieldAddress(T0, Function::code_offset()));
   __ Ret();
 
   __ Bind(&miss);
   __ LoadIsolate(T2);
   __ lw(CODE_REG, Address(T2, Isolate::ic_miss_code_offset()));
   __ lw(T1, FieldAddress(CODE_REG, Code::entry_point_offset()));
   __ Ret();
 }
 
+
+void StubCode::GenerateICLookupStub(Assembler* assembler) {
+  EmitICLookup(assembler, 1, Token::kILLEGAL);
+}
+
+
+void StubCode::GenerateICSmiAddLookupStub(Assembler* assembler) {
+  EmitICLookup(assembler, 2, Token::kADD);
+}
+
+
+void StubCode::GenerateICSmiSubLookupStub(Assembler* assembler) {
+  EmitICLookup(assembler, 2, Token::kSUB);
+}
+
+
+void StubCode::GenerateICSmiEqualLookupStub(Assembler* assembler) {
+  EmitICLookup(assembler, 2, Token::kEQ);
+}
+
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS