Eliminates some branches from arm code.

runtime/vm/intermediate_language_arm.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"  // Needed here to get TARGET_ARCH_ARM.
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/intermediate_language.h"
 
 #include "vm/cpu.h"
@@ skipping 419 matching lines @@
   }
   UNREACHABLE();
   return NULL;
 }
 
 
 static void LoadValueCid(FlowGraphCompiler* compiler,
                          Register value_cid_reg,
                          Register value_reg,
                          Label* value_is_smi = NULL) {
-  Label done;
   if (value_is_smi == NULL) {
     __ mov(value_cid_reg, Operand(kSmiCid));
   }
   __ tst(value_reg, Operand(kSmiTagMask));
   if (value_is_smi == NULL) {
-    __ b(&done, EQ);
+    __ LoadClassId(value_cid_reg, value_reg, NE);
   } else {
     __ b(value_is_smi, EQ);
+    __ LoadClassId(value_cid_reg, value_reg);
   }
-  __ LoadClassId(value_cid_reg, value_reg);
-  __ Bind(&done);
 }
 
 
 static Condition FlipCondition(Condition condition) {
   switch (condition) {
     case EQ: return EQ;
     case NE: return NE;
     case LT: return GT;
     case LE: return GE;
     case GT: return LT;
@@ skipping 586 matching lines @@
   return LocationSummary::Make(isolate,
                                kNumInputs,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
 void LoadClassIdInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register object = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();
-  Label load, done;
   __ tst(object, Operand(kSmiTagMask));
-  __ b(&load, NE);
-  __ LoadImmediate(result, Smi::RawValue(kSmiCid));
-  __ b(&done);
-  __ Bind(&load);
-  __ LoadClassId(result, object);
-  __ SmiTag(result);
-  __ Bind(&done);
+  __ LoadImmediate(result, Smi::RawValue(kSmiCid), EQ);
+  __ LoadClassId(result, object, NE);
+  __ SmiTag(result, NE);
 }
 
 
 CompileType LoadIndexedInstr::ComputeType() const {
   switch (class_id_) {
     case kArrayCid:
     case kImmutableArrayCid:
       return CompileType::Dynamic();
 
     case kTypedDataFloat32ArrayCid:
@@ skipping 4035 matching lines @@
 }
 
 
 void DoubleToIntegerInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   const Register result = locs()->out(0).reg();
   const Register value_obj = locs()->in(0).reg();
   ASSERT(result == R0);
   ASSERT(result != value_obj);
   __ LoadDFromOffset(DTMP, value_obj, Double::value_offset() - kHeapObjectTag);
 
-  Label do_call, done;
+  Label done, do_call;
   // First check for NaN. Checking for minint after the conversion doesn't work
   // on ARM because vcvtid gives 0 for NaN.
   __ vcmpd(DTMP, DTMP);
   __ vmstat();
   __ b(&do_call, VS);
 
   __ vcvtid(STMP, DTMP);
   __ vmovrs(result, STMP);
   // Overflow is signaled with minint.
 
   // Check for overflow and that it fits into Smi.
   __ CompareImmediate(result, 0xC0000000);
-  __ b(&do_call, MI);
-  __ SmiTag(result);
-  __ b(&done);
+  __ SmiTag(result, PL);
+  __ b(&done, PL);
+
   __ Bind(&do_call);
   __ Push(value_obj);
   ASSERT(instance_call()->HasICData());
   const ICData& ic_data = *instance_call()->ic_data();
   ASSERT((ic_data.NumberOfChecks() == 1));
   const Function& target = Function::ZoneHandle(ic_data.GetTargetAt(0));
 
   const intptr_t kNumberOfArguments = 1;
   compiler->GenerateStaticCall(deopt_id(),
                                instance_call()->token_pos(),
@@ skipping 1209 matching lines @@
   compiler->GenerateCall(token_pos(),
                          &label,
                          PcDescriptors::kOther,
                          locs());
   __ Drop(ArgumentCount());  // Discard arguments.
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM