Removed 31-bit smis.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 3768244e4d570f9c9fe69cb7c472d3f26c366581..614f67b0aae87b823545b9a71b86f0454e96d6ed 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -428,8 +428,6 @@ void MacroAssembler::Set(const Operand& dst, int64_t x) {
 // ----------------------------------------------------------------------------
 // Smi tagging, untagging and tag detection.
 
-#ifdef V8_LONG_SMI
-
 static int kSmiShift = kSmiTagSize + kSmiShiftSize;
 
 void MacroAssembler::Integer32ToSmi(Register dst, Register src) {
@@ -1210,736 +1208,6 @@ SmiIndex MacroAssembler::SmiToNegativeIndex(Register dst,
   return SmiIndex(dst, times_1);
 }
 
-#else  // ! V8_LONG_SMI
-// 31 bit smi operations
-
-// Extracts the low 32 bits of a Smi pointer, where the taqgged smi value
-// is stored.
-static int32_t SmiValue(Smi* smi) {
-  return static_cast<int32_t>(reinterpret_cast<intptr_t>(smi));
-}
-
-
-void MacroAssembler::Integer32ToSmi(Register dst, Register src) {
-  ASSERT_EQ(1, kSmiTagSize);
-  ASSERT_EQ(0, kSmiTag);
-#ifdef DEBUG
-  if (allow_stub_calls()) {
-    cmpl(src, Immediate(0xC0000000u));
-    Check(positive, "Smi conversion overflow");
-  }
-#endif
-  if (dst.is(src)) {
-    addl(dst, src);
-  } else {
-    lea(dst, Operand(src, src, times_1, 0));
-  }
-}
-
-
-void MacroAssembler::Integer32ToSmi(Register dst,
-                                    Register src,
-                                    Label* on_overflow) {
-  ASSERT_EQ(1, kSmiTagSize);
-  ASSERT_EQ(0, kSmiTag);
-  if (!dst.is(src)) {
-    movl(dst, src);
-  }
-  addl(dst, src);
-  j(overflow, on_overflow);
-}
-
-
-void MacroAssembler::Integer64PlusConstantToSmi(Register dst,
-                                                Register src,
-                                                int constant) {
-#ifdef DEBUG
-  if (allow_stub_calls()) {
-    movl(kScratchRegister, src);
-    addl(kScratchRegister, Immediate(constant));
-    Check(no_overflow, "Add-and-smi-convert overflow");
-    Condition valid = CheckInteger32ValidSmiValue(kScratchRegister);
-    Check(valid, "Add-and-smi-convert overflow");
-  }
-#endif
-  lea(dst, Operand(src, src, times_1, constant << kSmiTagSize));
-}
-
-
-void MacroAssembler::SmiToInteger32(Register dst, Register src) {
-  ASSERT_EQ(1, kSmiTagSize);
-  ASSERT_EQ(0, kSmiTag);
-  if (!dst.is(src)) {
-    movl(dst, src);
-  }
-  sarl(dst, Immediate(kSmiTagSize));
-}
-
-
-void MacroAssembler::SmiToInteger64(Register dst, Register src) {
-  ASSERT_EQ(1, kSmiTagSize);
-  ASSERT_EQ(0, kSmiTag);
-  movsxlq(dst, src);
-  sar(dst, Immediate(kSmiTagSize));
-}
-
-
-void MacroAssembler::SmiTest(Register src) {
-  testl(src, src);
-}
-
-
-void MacroAssembler::SmiCompare(Register dst, Register src) {
-  cmpl(dst, src);
-}
-
-
-void MacroAssembler::SmiCompare(Register dst, Smi* src) {
-  ASSERT(!dst.is(kScratchRegister));
-  if (src->value() == 0) {
-    testl(dst, dst);
-  } else {
-    cmpl(dst, Immediate(SmiValue(src)));
-  }
-}
-
-
-void MacroAssembler::SmiCompare(const Operand& dst, Register src) {
-  cmpl(dst, src);
-}
-
-
-void MacroAssembler::SmiCompare(const Operand& dst, Smi* src) {
-  if (src->value() == 0) {
-    movl(kScratchRegister, dst);
-    testl(kScratchRegister, kScratchRegister);
-  } else {
-    cmpl(dst, Immediate(SmiValue(src)));
-  }
-}
-
-
-void MacroAssembler::PositiveSmiTimesPowerOfTwoToInteger64(Register dst,
-                                                           Register src,
-                                                           int power) {
-  ASSERT(power >= 0);
-  ASSERT(power < 64);
-  if (power == 0) {
-    SmiToInteger64(dst, src);
-    return;
-  }
-  movsxlq(dst, src);
-  shl(dst, Immediate(power - 1));
-}
-
-Condition MacroAssembler::CheckSmi(Register src) {
-  testb(src, Immediate(kSmiTagMask));
-  return zero;
-}
-
-Condition MacroAssembler::CheckPositiveSmi(Register src) {
-  ASSERT_EQ(0, kSmiTag);
-  testl(src, Immediate(static_cast<uint32_t>(0x80000000u | kSmiTagMask)));
-  return zero;
-}
-
-Condition MacroAssembler::CheckBothSmi(Register first, Register second) {
-  if (first.is(second)) {
-    return CheckSmi(first);
-  }
-  movl(kScratchRegister, first);
-  orl(kScratchRegister, second);
-  return CheckSmi(kScratchRegister);
-}
-
-Condition MacroAssembler::CheckIsMinSmi(Register src) {
-  ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
-  cmpl(src, Immediate(0x80000000u));
-  return equal;
-}
-
-Condition MacroAssembler::CheckInteger32ValidSmiValue(Register src) {
-  // A 32-bit integer value can be converted to a smi if it is in the
-  // range [-2^30 .. 2^30-1]. That is equivalent to having its 32-bit
-  // representation have bits 30 and 31 be equal.
-  cmpl(src, Immediate(0xC0000000u));
-  return positive;
-}
-
-
-void MacroAssembler::SmiNeg(Register dst,
-                            Register src,
-                            Label* on_smi_result) {
-  if (!dst.is(src)) {
-    movl(dst, src);
-  }
-  negl(dst);
-  testl(dst, Immediate(0x7fffffff));
-  // If the result is zero or 0x80000000, negation failed to create a smi.
-  j(not_equal, on_smi_result);
-}
-
-
-void MacroAssembler::SmiAdd(Register dst,
-                            Register src1,
-                            Register src2,
-                            Label* on_not_smi_result) {
-  ASSERT(!dst.is(src2));
-  if (!dst.is(src1)) {
-    movl(dst, src1);
-  }
-  addl(dst, src2);
-  if (!dst.is(src1)) {
-    j(overflow, on_not_smi_result);
-  } else {
-    Label smi_result;
-    j(no_overflow, &smi_result);
-    // Restore src1.
-    subl(src1, src2);
-    jmp(on_not_smi_result);
-    bind(&smi_result);
-  }
-}
-
-
-void MacroAssembler::SmiSub(Register dst,
-                            Register src1,
-                            Register src2,
-                            Label* on_not_smi_result) {
-  ASSERT(!dst.is(src2));
-  if (!dst.is(src1)) {
-    movl(dst, src1);
-  }
-  subl(dst, src2);
-  if (!dst.is(src1)) {
-    j(overflow, on_not_smi_result);
-  } else {
-    Label smi_result;
-    j(no_overflow, &smi_result);
-    // Restore src1.
-    addl(src1, src2);
-    jmp(on_not_smi_result);
-    bind(&smi_result);
-  }
-}
-
-
-void MacroAssembler::SmiMul(Register dst,
-                            Register src1,
-                            Register src2,
-                            Label* on_not_smi_result) {
-  ASSERT(!dst.is(src2));
-
-  if (dst.is(src1)) {
-    // Copy src1 before overwriting.
-    movq(kScratchRegister, src1);
-  }
-  SmiToInteger32(dst, src1);
-
-  imull(dst, src2);
-  j(overflow, on_not_smi_result);
-
-  // Check for negative zero result.  If product is zero, and one
-  // argument is negative, go to slow case.  The frame is unchanged
-  // in this block, so local control flow can use a Label rather
-  // than a JumpTarget.
-  Label non_zero_result;
-  testl(dst, dst);
-  j(not_zero, &non_zero_result);
-
-  // Test whether either operand is negative (the other must be zero).
-  if (!dst.is(src1)) {
-    movl(kScratchRegister, src1);
-  }
-  orl(kScratchRegister, src2);
-  j(negative, on_not_smi_result);
-
-  bind(&non_zero_result);
-}
-
-
-void MacroAssembler::SmiTryAddConstant(Register dst,
-                                       Register src,
-                                       Smi* constant,
-                                       Label* on_not_smi_result) {
-  // Does not assume that src is a smi.
-  ASSERT_EQ(static_cast<intptr_t>(1), kSmiTagMask);
-  ASSERT_EQ(0, kSmiTag);
-
-  Register tmp = (src.is(dst) ? kScratchRegister : dst);
-  movl(tmp, src);
-  addl(tmp, Immediate(SmiValue(constant)));
-  if (tmp.is(kScratchRegister)) {
-    j(overflow, on_not_smi_result);
-    testl(tmp, Immediate(kSmiTagMask));
-    j(not_zero, on_not_smi_result);
-    movl(dst, tmp);
-  } else {
-    movl(kScratchRegister, Immediate(kSmiTagMask));
-    cmovl(overflow, dst, kScratchRegister);
-    testl(dst, kScratchRegister);
-    j(not_zero, on_not_smi_result);
-  }
-}
-
-
-void MacroAssembler::SmiAddConstant(Register dst,
-                                    Register src,
-                                    Smi* constant) {
-  ASSERT_EQ(1, kSmiTagMask);
-  ASSERT_EQ(0, kSmiTag);
-  int32_t smi_value = SmiValue(constant);
-  if (dst.is(src)) {
-    addl(dst, Immediate(smi_value));
-  } else {
-    lea(dst, Operand(src, smi_value));
-  }
-}
-
-
-void MacroAssembler::SmiAddConstant(Register dst,
-                                    Register src,
-                                    Smi* constant,
-                                    Label* on_not_smi_result) {
-  ASSERT_EQ(1, kSmiTagMask);
-  ASSERT_EQ(0, kSmiTag);
-  int32_t smi_value = SmiValue(constant);
-  if (!dst.is(src)) {
-    movl(dst, src);
-    addl(dst, Immediate(smi_value));
-    j(overflow, on_not_smi_result);
-  } else {
-    addl(dst, Immediate(smi_value));
-    Label result_ok;
-    j(no_overflow, &result_ok);
-    subl(dst, Immediate(smi_value));
-    jmp(on_not_smi_result);
-    bind(&result_ok);
-  }
-}
-
-
-void MacroAssembler::SmiSubConstant(Register dst,
-                                    Register src,
-                                    Smi* constant) {
-  ASSERT_EQ(1, kSmiTagMask);
-  ASSERT_EQ(0, kSmiTag);
-  if (!dst.is(src)) {
-    movl(dst, src);
-  }
-  subl(dst, Immediate(SmiValue(constant)));
-}
-
-
-void MacroAssembler::SmiSubConstant(Register dst,
-                                    Register src,
-                                    Smi* constant,
-                                    Label* on_not_smi_result) {
-  ASSERT_EQ(1, kSmiTagMask);
-  ASSERT_EQ(0, kSmiTag);
-  int32_t smi_value = SmiValue(constant);
-  if (dst.is(src)) {
-    // Optimistic subtract - may change value of dst register,
-    // if it has garbage bits in the higher half, but will not change
-    // the value as a tagged smi.
-    subl(dst, Immediate(smi_value));
-    Label add_success;
-    j(no_overflow, &add_success);
-    addl(dst, Immediate(smi_value));
-    jmp(on_not_smi_result);
-    bind(&add_success);
-  } else {
-    movl(dst, src);
-    subl(dst, Immediate(smi_value));
-    j(overflow, on_not_smi_result);
-  }
-}
-
-
-void MacroAssembler::SmiDiv(Register dst,
-                            Register src1,
-                            Register src2,
-                            Label* on_not_smi_result) {
-  ASSERT(!src2.is(rax));
-  ASSERT(!src2.is(rdx));
-  ASSERT(!src1.is(rdx));
-
-  // Check for 0 divisor (result is +/-Infinity).
-  Label positive_divisor;
-  testl(src2, src2);
-  j(zero, on_not_smi_result);
-  j(positive, &positive_divisor);
-  // Check for negative zero result.  If the dividend is zero, and the
-  // divisor is negative, return a floating point negative zero.
-  testl(src1, src1);
-  j(zero, on_not_smi_result);
-  bind(&positive_divisor);
-
-  // Sign extend src1 into edx:eax.
-  if (!src1.is(rax)) {
-    movl(rax, src1);
-  }
-  cdq();
-
-  idivl(src2);
-  // Check for the corner case of dividing the most negative smi by
-  // -1. We cannot use the overflow flag, since it is not set by
-  // idiv instruction.
-  ASSERT(kSmiTag == 0 && kSmiTagSize == 1);
-  cmpl(rax, Immediate(0x40000000));
-  j(equal, on_not_smi_result);
-  // Check that the remainder is zero.
-  testl(rdx, rdx);
-  j(not_zero, on_not_smi_result);
-  // Tag the result and store it in the destination register.
-  Integer32ToSmi(dst, rax);
-}
-
-
-void MacroAssembler::SmiMod(Register dst,
-                            Register src1,
-                            Register src2,
-                            Label* on_not_smi_result) {
-  ASSERT(!dst.is(kScratchRegister));
-  ASSERT(!src1.is(kScratchRegister));
-  ASSERT(!src2.is(kScratchRegister));
-  ASSERT(!src2.is(rax));
-  ASSERT(!src2.is(rdx));
-  ASSERT(!src1.is(rdx));
-
-  testl(src2, src2);
-  j(zero, on_not_smi_result);
-
-  if (src1.is(rax)) {
-    // Mist remember the value to see if a zero result should
-    // be a negative zero.
-    movl(kScratchRegister, rax);
-  } else {
-    movl(rax, src1);
-  }
-  // Sign extend eax into edx:eax.
-  cdq();
-  idivl(src2);
-  // Check for a negative zero result.  If the result is zero, and the
-  // dividend is negative, return a floating point negative zero.
-  Label non_zero_result;
-  testl(rdx, rdx);
-  j(not_zero, &non_zero_result);
-  if (src1.is(rax)) {
-    testl(kScratchRegister, kScratchRegister);
-  } else {
-    testl(src1, src1);
-  }
-  j(negative, on_not_smi_result);
-  bind(&non_zero_result);
-  if (!dst.is(rdx)) {
-    movl(dst, rdx);
-  }
-}
-
-
-void MacroAssembler::SmiNot(Register dst, Register src) {
-  if (dst.is(src)) {
-    not_(dst);
-    // Remove inverted smi-tag.  The mask is sign-extended to 64 bits.
-    xor_(src, Immediate(kSmiTagMask));
-  } else {
-    ASSERT_EQ(0, kSmiTag);
-    lea(dst, Operand(src, kSmiTagMask));
-    not_(dst);
-  }
-}
-
-
-void MacroAssembler::SmiAnd(Register dst, Register src1, Register src2) {
-  if (!dst.is(src1)) {
-    movl(dst, src1);
-  }
-  and_(dst, src2);
-}
-
-
-void MacroAssembler::SmiAndConstant(Register dst, Register src, Smi* constant) {
-  if (!dst.is(src)) {
-    movl(dst, src);
-  }
-  int32_t smi_value = SmiValue(constant);
-  and_(dst, Immediate(smi_value));
-}
-
-
-void MacroAssembler::SmiOr(Register dst, Register src1, Register src2) {
-  if (!dst.is(src1)) {
-    movl(dst, src1);
-  }
-  or_(dst, src2);
-}
-
-
-void MacroAssembler::SmiOrConstant(Register dst, Register src, Smi* constant) {
-  if (!dst.is(src)) {
-    movl(dst, src);
-  }
-  int32_t smi_value = SmiValue(constant);
-  or_(dst, Immediate(smi_value));
-}
-
-
-void MacroAssembler::SmiXor(Register dst, Register src1, Register src2) {
-  if (!dst.is(src1)) {
-    movl(dst, src1);
-  }
-  xor_(dst, src2);
-}
-
-
-void MacroAssembler::SmiXorConstant(Register dst, Register src, Smi* constant) {
-  if (!dst.is(src)) {
-    movl(dst, src);
-  }
-  int32_t smi_value = SmiValue(constant);
-  xor_(dst, Immediate(smi_value));
-}
-
-
-void MacroAssembler::SmiShiftArithmeticRightConstant(Register dst,
-                                                     Register src,
-                                                     int shift_value) {
-  if (shift_value > 0) {
-    if (dst.is(src)) {
-      sarl(dst, Immediate(shift_value));
-      and_(dst, Immediate(~kSmiTagMask));
-    } else {
-      UNIMPLEMENTED();  // Not used.
-    }
-  }
-}
-
-
-void MacroAssembler::SmiShiftLogicalRightConstant(Register dst,
-                                                  Register src,
-                                                  int shift_value,
-                                                  Label* on_not_smi_result) {
-  // Logic right shift interprets its result as an *unsigned* number.
-  if (dst.is(src)) {
-    UNIMPLEMENTED();  // Not used.
-  } else {
-    movl(dst, src);
-    // Untag the smi.
-    sarl(dst, Immediate(kSmiTagSize));
-    if (shift_value < 2) {
-      // A negative Smi shifted right two is in the positive Smi range,
-      // but if shifted only by zero or one, it never is.
-      j(negative, on_not_smi_result);
-    }
-    if (shift_value > 0) {
-      // Do the right shift on the integer value.
-      shrl(dst, Immediate(shift_value));
-    }
-    // Re-tag the result.
-    addl(dst, dst);
-  }
-}
-
-
-void MacroAssembler::SmiShiftLeftConstant(Register dst,
-                                          Register src,
-                                          int shift_value,
-                                          Label* on_not_smi_result) {
-  if (dst.is(src)) {
-    if (shift_value > 0) {
-      movq(kScratchRegister, src);
-      // Treat scratch as an untagged integer value equal to two times the
-      // smi value of src, i.e., already shifted left by one.
-      if (shift_value > 1) {
-        shll(kScratchRegister, Immediate(shift_value - 1));
-      }
-      JumpIfNotValidSmiValue(kScratchRegister, on_not_smi_result);
-      // Convert int result to Smi, checking that it is in smi range.
-      ASSERT(kSmiTagSize == 1);  // adjust code if not the case
-      Integer32ToSmi(dst, kScratchRegister);
-    }
-  } else {
-    movl(dst, src);
-    if (shift_value > 0) {
-      // Treat dst as an untagged integer value equal to two times the
-      // smi value of src, i.e., already shifted left by one.
-      if (shift_value > 1) {
-        shll(dst, Immediate(shift_value - 1));
-      }
-      // Convert int result to Smi, checking that it is in smi range.
-      ASSERT(kSmiTagSize == 1);  // adjust code if not the case
-      Integer32ToSmi(dst, dst, on_not_smi_result);
-    }
-  }
-}
-
-
-void MacroAssembler::SmiShiftLeft(Register dst,
-                                  Register src1,
-                                  Register src2,
-                                  Label* on_not_smi_result) {
-  ASSERT(!dst.is(rcx));
-  Label result_ok;
-  // Untag both operands.
-  if (dst.is(src1) || src1.is(rcx)) {
-    movq(kScratchRegister, src1);
-  }
-  SmiToInteger32(dst, src1);
-  SmiToInteger32(rcx, src2);
-  shll(dst);
-  // Check that the *signed* result fits in a smi.
-  Condition is_valid = CheckInteger32ValidSmiValue(dst);
-  j(is_valid, &result_ok);
-  // Restore the relevant bits of the source registers
-  // and call the slow version.
-  if (dst.is(src1) || src1.is(rcx)) {
-    movq(src1, kScratchRegister);
-  }
-  if (src2.is(rcx)) {
-    Integer32ToSmi(rcx, rcx);
-  }
-  jmp(on_not_smi_result);
-  bind(&result_ok);
-  Integer32ToSmi(dst, dst);
-}
-
-
-void MacroAssembler::SmiShiftLogicalRight(Register dst,
-                                          Register src1,
-                                          Register src2,
-                                          Label* on_not_smi_result) {
-  ASSERT(!dst.is(kScratchRegister));
-  ASSERT(!src1.is(kScratchRegister));
-  ASSERT(!src2.is(kScratchRegister));
-  ASSERT(!dst.is(rcx));
-  Label result_ok;
-  // Untag both operands.
-  if (src1.is(rcx)) {
-    movq(kScratchRegister, src1);
-  }
-  SmiToInteger32(dst, src1);
-  SmiToInteger32(rcx, src2);
-
-  shrl(dst);
-  // Check that the *unsigned* result fits in a smi.
-  // I.e., that it is a valid positive smi value. The positive smi
-  // values are  0..0x3fffffff, i.e., neither of the top-most two
-  // bits can be set.
-  //
-  // These two cases can only happen with shifts by 0 or 1 when
-  // handed a valid smi.  If the answer cannot be represented by a
-  // smi, restore the left and right arguments, and jump to slow
-  // case.  The low bit of the left argument may be lost, but only
-  // in a case where it is dropped anyway.
-  testl(dst, Immediate(0xc0000000));
-  j(zero, &result_ok);
-  if (dst.is(src1)) {
-    shll(dst);
-    Integer32ToSmi(dst, dst);
-  } else if (src1.is(rcx)) {
-    movq(rcx, kScratchRegister);
-  } else if (src2.is(rcx)) {
-    Integer32ToSmi(src2, src2);
-  }
-  jmp(on_not_smi_result);
-  bind(&result_ok);
-  // Smi-tag the result in answer.
-  Integer32ToSmi(dst, dst);
-}
-
-
-void MacroAssembler::SmiShiftArithmeticRight(Register dst,
-                                             Register src1,
-                                             Register src2) {
-  ASSERT(!dst.is(rcx));
-  // Untag both operands.
-  SmiToInteger32(dst, src1);
-  SmiToInteger32(rcx, src2);
-  // Shift as integer.
-  sarl(dst);
-  // Retag result.
-  Integer32ToSmi(dst, dst);
-}
-
-
-void MacroAssembler::SelectNonSmi(Register dst,
-                                  Register src1,
-                                  Register src2,
-                                  Label* on_not_smis) {
-  ASSERT(!dst.is(src1));
-  ASSERT(!dst.is(src2));
-  // Both operands must not be smis.
-#ifdef DEBUG
-  if (allow_stub_calls()) {
-    Condition not_both_smis = NegateCondition(CheckBothSmi(src1, src2));
-    Check(not_both_smis, "Both registers were smis.");
-  }
-#endif
-  ASSERT_EQ(0, kSmiTag);
-  ASSERT_EQ(0, Smi::FromInt(0));
-  movq(kScratchRegister, Immediate(kSmiTagMask));
-  and_(kScratchRegister, src1);
-  testl(kScratchRegister, src2);
-  j(not_zero, on_not_smis);
-  // One operand is a smi.
-
-  ASSERT_EQ(1, static_cast<int>(kSmiTagMask));
-  // kScratchRegister still holds src1 & kSmiTag, which is either zero or one.
-  subq(kScratchRegister, Immediate(1));
-  // If src1 is a smi, then scratch register all 1s, else it is all 0s.
-  movq(dst, src1);
-  xor_(dst, src2);
-  and_(dst, kScratchRegister);
-  // If src1 is a smi, dst holds src1 ^ src2, else it is zero.
-  xor_(dst, src1);
-  // If src1 is a smi, dst is src2, else it is src1, i.e., a non-smi.
-}
-
-
-SmiIndex MacroAssembler::SmiToIndex(Register dst, Register src, int shift) {
-  ASSERT(is_uint6(shift));
-  if (shift == 0) {  // times_1.
-    SmiToInteger32(dst, src);
-    return SmiIndex(dst, times_1);
-  }
-  if (shift <= 4) {  // 2 - 16 times multiplier is handled using ScaleFactor.
-    // We expect that all smis are actually zero-padded. If this holds after
-    // checking, this line can be omitted.
-    movl(dst, src);  // Ensure that the smi is zero-padded.
-    return SmiIndex(dst, static_cast<ScaleFactor>(shift - kSmiTagSize));
-  }
-  // Shift by shift-kSmiTagSize.
-  movl(dst, src);  // Ensure that the smi is zero-padded.
-  shl(dst, Immediate(shift - kSmiTagSize));
-  return SmiIndex(dst, times_1);
-}
-
-
-SmiIndex MacroAssembler::SmiToNegativeIndex(Register dst,
-                                            Register src,
-                                            int shift) {
-  // Register src holds a positive smi.
-  ASSERT(is_uint6(shift));
-  if (shift == 0) {  // times_1.
-    SmiToInteger32(dst, src);
-    neg(dst);
-    return SmiIndex(dst, times_1);
-  }
-  if (shift <= 4) {  // 2 - 16 times multiplier is handled using ScaleFactor.
-    movl(dst, src);
-    neg(dst);
-    return SmiIndex(dst, static_cast<ScaleFactor>(shift - kSmiTagSize));
-  }
-  // Shift by shift-kSmiTagSize.
-  movl(dst, src);
-  neg(dst);
-  shl(dst, Immediate(shift - kSmiTagSize));
-  return SmiIndex(dst, times_1);
-}
-
-#endif  // V8_LONG_SMI
-
 
 void MacroAssembler::JumpIfSmi(Register src, Label* on_smi) {
   ASSERT_EQ(0, kSmiTag);