X86 jump tables for PackedSwitch

Implement X86PackedSwitch using a jump table of offsets to blocks. The
X86PackedSwitch version just adds an input to address the constant area.

Change-Id: Id2752a1ee79222493040c6fd0e59aee9a544b76a
Bug: 21119474
Signed-off-by: Mark Mendell <mark.p.mendell@intel.com>

1 files changed, 14 insertions, 10 deletions

diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index 04e815aa1d..5347bf0302 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -2369,44 +2369,48 @@ void X86Assembler::AddConstantArea() {
   }
 }
 
-int ConstantArea::AddInt32(int32_t v) {
+size_t ConstantArea::AppendInt32(int32_t v) {
+  size_t result = buffer_.size() * elem_size_;
+  buffer_.push_back(v);
+  return result;
+}
+
+size_t ConstantArea::AddInt32(int32_t v) {
   for (size_t i = 0, e = buffer_.size(); i < e; i++) {
     if (v == buffer_[i]) {
-      return i * kEntrySize;
+      return i * elem_size_;
     }
   }
 
   // Didn't match anything.
-  int result = buffer_.size() * kEntrySize;
-  buffer_.push_back(v);
-  return result;
+  return AppendInt32(v);
 }
 
-int ConstantArea::AddInt64(int64_t v) {
+size_t ConstantArea::AddInt64(int64_t v) {
   int32_t v_low = Low32Bits(v);
   int32_t v_high = High32Bits(v);
   if (buffer_.size() > 1) {
     // Ensure we don't pass the end of the buffer.
     for (size_t i = 0, e = buffer_.size() - 1; i < e; i++) {
       if (v_low == buffer_[i] && v_high == buffer_[i + 1]) {
-        return i * kEntrySize;
+        return i * elem_size_;
       }
     }
   }
 
   // Didn't match anything.
-  int result = buffer_.size() * kEntrySize;
+  size_t result = buffer_.size() * elem_size_;
   buffer_.push_back(v_low);
   buffer_.push_back(v_high);
   return result;
 }
 
-int ConstantArea::AddDouble(double v) {
+size_t ConstantArea::AddDouble(double v) {
   // Treat the value as a 64-bit integer value.
   return AddInt64(bit_cast<int64_t, double>(v));
 }
 
-int ConstantArea::AddFloat(float v) {
+size_t ConstantArea::AddFloat(float v) {
   // Treat the value as a 32-bit integer value.
   return AddInt32(bit_cast<int32_t, float>(v));
 }