[intrinsics] Kill the %_IsMinusZero intrinsic.

src/crankshaft/x87/lithium-codegen-x87.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.
 
 #if V8_TARGET_ARCH_X87
 
 #include "src/crankshaft/x87/lithium-codegen-x87.h"
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 2487 matching lines @@
 
   __ add(esp, Immediate(kDoubleSize));
   int offset = sizeof(kHoleNanUpper32);
   // x87 converts sNaN(0xfff7fffffff7ffff) to QNaN(0xfffffffffff7ffff),
   // so we check the upper with 0xffffffff for hole as a temporary fix.
   __ cmp(MemOperand(esp, -offset), Immediate(0xffffffff));
   EmitBranch(instr, equal);
 }
 
 
-void LCodeGen::DoCompareMinusZeroAndBranch(LCompareMinusZeroAndBranch* instr) {
-  Representation rep = instr->hydrogen()->value()->representation();
-  DCHECK(!rep.IsInteger32());
-
-  if (rep.IsDouble()) {
-    X87Register input = ToX87Register(instr->value());
-    X87LoadForUsage(input);
-    __ FXamMinusZero();
-    EmitBranch(instr, equal);
-  } else {
-    Register value = ToRegister(instr->value());
-    Handle<Map> map = masm()->isolate()->factory()->heap_number_map();
-    __ CheckMap(value, map, instr->FalseLabel(chunk()), DO_SMI_CHECK);
-    __ cmp(FieldOperand(value, HeapNumber::kExponentOffset),
-           Immediate(0x1));
-    EmitFalseBranch(instr, no_overflow);
-    __ cmp(FieldOperand(value, HeapNumber::kMantissaOffset),
-           Immediate(0x00000000));
-    EmitBranch(instr, equal);
-  }
-}
-
-
 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);
   }
 
   Condition cond = masm_->IsObjectStringType(input, temp1, temp1);
 
@@ skipping 3475 matching lines @@
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87