[intrinsics] Kill the %_IsMinusZero intrinsic.

src/ppc/macro-assembler-ppc.cc

 // Copyright 2014 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 <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
@@ skipping 2190 matching lines @@
   MovDoubleToInt64(scratch1, scratch2, input);
   Label done;
   cmpi(scratch2, Operand::Zero());
   bne(&done);
   lis(scratch2, Operand(SIGN_EXT_IMM16(0x8000)));
   cmp(scratch1, scratch2);
   bind(&done);
 #endif
 }
 
-void MacroAssembler::TestHeapNumberIsMinusZero(Register input,
-                                               Register scratch1,
-                                               Register scratch2) {
-#if V8_TARGET_ARCH_PPC64
-  LoadP(scratch1, FieldMemOperand(input, HeapNumber::kValueOffset));
-  rotldi(scratch1, scratch1, 1);
-  cmpi(scratch1, Operand(1));
-#else
-  lwz(scratch1, FieldMemOperand(input, HeapNumber::kExponentOffset));
-  lwz(scratch2, FieldMemOperand(input, HeapNumber::kMantissaOffset));
-  Label done;
-  cmpi(scratch2, Operand::Zero());
-  bne(&done);
-  lis(scratch2, Operand(SIGN_EXT_IMM16(0x8000)));
-  cmp(scratch1, scratch2);
-  bind(&done);
-#endif
-}
-
 void MacroAssembler::TestDoubleSign(DoubleRegister input, Register scratch) {
 #if V8_TARGET_ARCH_PPC64
   MovDoubleToInt64(scratch, input);
 #else
   MovDoubleHighToInt(scratch, input);
 #endif
   cmpi(scratch, Operand::Zero());
 }
 
 void MacroAssembler::TestHeapNumberSign(Register input, Register scratch) {
@@ skipping 2171 matching lines @@
   }
   if (mag.shift > 0) srawi(result, result, mag.shift);
   ExtractBit(r0, dividend, 31);
   add(result, result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC