[intrinsics] Kill the %_IsMinusZero intrinsic.

src/crankshaft/arm/lithium-codegen-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/crankshaft/arm/lithium-codegen-arm.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/crankshaft/arm/lithium-gap-resolver-arm.h"
@@ skipping 2295 matching lines @@
   __ VFPCompareAndSetFlags(input_reg, input_reg);
   EmitFalseBranch(instr, vc);
 
   Register scratch = scratch0();
   __ VmovHigh(scratch, input_reg);
   __ cmp(scratch, Operand(kHoleNanUpper32));
   EmitBranch(instr, eq);
 }
 
 
-void LCodeGen::DoCompareMinusZeroAndBranch(LCompareMinusZeroAndBranch* instr) {
-  Representation rep = instr->hydrogen()->value()->representation();
-  DCHECK(!rep.IsInteger32());
-  Register scratch = ToRegister(instr->temp());
-
-  if (rep.IsDouble()) {
-    DwVfpRegister value = ToDoubleRegister(instr->value());
-    __ VFPCompareAndSetFlags(value, 0.0);
-    EmitFalseBranch(instr, ne);
-    __ VmovHigh(scratch, value);
-    __ cmp(scratch, Operand(0x80000000));
-  } else {
-    Register value = ToRegister(instr->value());
-    __ CheckMap(value,
-                scratch,
-                Heap::kHeapNumberMapRootIndex,
-                instr->FalseLabel(chunk()),
-                DO_SMI_CHECK);
-    __ ldr(scratch, FieldMemOperand(value, HeapNumber::kExponentOffset));
-    __ ldr(ip, FieldMemOperand(value, HeapNumber::kMantissaOffset));
-    __ cmp(scratch, Operand(0x80000000));
-    __ cmp(ip, Operand(0x00000000), eq);
-  }
-  EmitBranch(instr, eq);
-}
-
-
 Condition LCodeGen::EmitIsString(Register input,
                                  Register temp1,
                                  Label* is_not_string,
                                  SmiCheck check_needed = INLINE_SMI_CHECK) {
   if (check_needed == INLINE_SMI_CHECK) {
     __ JumpIfSmi(input, is_not_string);
   }
   __ CompareObjectType(input, temp1, temp1, FIRST_NONSTRING_TYPE);
 
   return lt;
@@ skipping 3228 matching lines @@
   __ push(ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8