Remove some dead code.

src/ia32/register-allocator-ia32.cc

-// Copyright 2008 the V8 project authors. All rights reserved.
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-//       notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-//       copyright notice, this list of conditions and the following
-//       disclaimer in the documentation and/or other materials provided
-//       with the distribution.
-//     * Neither the name of Google Inc. nor the names of its
-//       contributors may be used to endorse or promote products derived
-//       from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#include "v8.h"
-
-#if defined(V8_TARGET_ARCH_IA32)
-
-#include "codegen-inl.h"
-#include "register-allocator-inl.h"
-#include "virtual-frame-inl.h"
-
-namespace v8 {
-namespace internal {
-
-// -------------------------------------------------------------------------
-// Result implementation.
-
-void Result::ToRegister() {
-  ASSERT(is_valid());
-  if (is_constant()) {
-    CodeGenerator* code_generator =
-        CodeGeneratorScope::Current(Isolate::Current());
-    Result fresh = code_generator->allocator()->Allocate();
-    ASSERT(fresh.is_valid());
-    if (is_untagged_int32()) {
-      fresh.set_untagged_int32(true);
-      if (handle()->IsSmi()) {
-      code_generator->masm()->Set(
-          fresh.reg(),
-          Immediate(Smi::cast(*handle())->value()));
-      } else if (handle()->IsHeapNumber()) {
-        double double_value = HeapNumber::cast(*handle())->value();
-        int32_t value = DoubleToInt32(double_value);
-        if (double_value == 0 && signbit(double_value)) {
-          // Negative zero must not be converted to an int32 unless
-          // the context allows it.
-          code_generator->unsafe_bailout_->Branch(equal);
-          code_generator->unsafe_bailout_->Branch(not_equal);
-        } else if (double_value == value) {
-          code_generator->masm()->Set(fresh.reg(), Immediate(value));
-        } else {
-          code_generator->unsafe_bailout_->Branch(equal);
-          code_generator->unsafe_bailout_->Branch(not_equal);
-        }
-      } else {
-        // Constant is not a number.  This was not predicted by AST analysis.
-        code_generator->unsafe_bailout_->Branch(equal);
-        code_generator->unsafe_bailout_->Branch(not_equal);
-      }
-    } else if (code_generator->IsUnsafeSmi(handle())) {
-      code_generator->MoveUnsafeSmi(fresh.reg(), handle());
-    } else {
-      code_generator->masm()->Set(fresh.reg(), Immediate(handle()));
-    }
-    // This result becomes a copy of the fresh one.
-    fresh.set_type_info(type_info());
-    *this = fresh;
-  }
-  ASSERT(is_register());
-}
-
-
-void Result::ToRegister(Register target) {
-  CodeGenerator* code_generator =
-      CodeGeneratorScope::Current(Isolate::Current());
-  ASSERT(is_valid());
-  if (!is_register() || !reg().is(target)) {
-    Result fresh = code_generator->allocator()->Allocate(target);
-    ASSERT(fresh.is_valid());
-    if (is_register()) {
-      code_generator->masm()->mov(fresh.reg(), reg());
-    } else {
-      ASSERT(is_constant());
-      if (is_untagged_int32()) {
-        if (handle()->IsSmi()) {
-          code_generator->masm()->Set(
-              fresh.reg(),
-              Immediate(Smi::cast(*handle())->value()));
-        } else {
-          ASSERT(handle()->IsHeapNumber());
-          double double_value = HeapNumber::cast(*handle())->value();
-          int32_t value = DoubleToInt32(double_value);
-          if (double_value == 0 && signbit(double_value)) {
-            // Negative zero must not be converted to an int32 unless
-            // the context allows it.
-            code_generator->unsafe_bailout_->Branch(equal);
-            code_generator->unsafe_bailout_->Branch(not_equal);
-          } else if (double_value == value) {
-            code_generator->masm()->Set(fresh.reg(), Immediate(value));
-          } else {
-            code_generator->unsafe_bailout_->Branch(equal);
-            code_generator->unsafe_bailout_->Branch(not_equal);
-          }
-        }
-      } else {
-        if (code_generator->IsUnsafeSmi(handle())) {
-          code_generator->MoveUnsafeSmi(fresh.reg(), handle());
-        } else {
-          code_generator->masm()->Set(fresh.reg(), Immediate(handle()));
-        }
-      }
-    }
-    fresh.set_type_info(type_info());
-    fresh.set_untagged_int32(is_untagged_int32());
-    *this = fresh;
-  } else if (is_register() && reg().is(target)) {
-    ASSERT(code_generator->has_valid_frame());
-    code_generator->frame()->Spill(target);
-    ASSERT(code_generator->allocator()->count(target) == 1);
-  }
-  ASSERT(is_register());
-  ASSERT(reg().is(target));
-}
-
-
-// -------------------------------------------------------------------------
-// RegisterAllocator implementation.
-
-Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() {
-  Result result = AllocateWithoutSpilling();
-  // Check that the register is a byte register.  If not, unuse the
-  // register if valid and return an invalid result.
-  if (result.is_valid() && !result.reg().is_byte_register()) {
-    result.Unuse();
-    return Result();
-  }
-  return result;
-}
-
-
-} }  // namespace v8::internal
-
-#endif  // V8_TARGET_ARCH_IA32