ART: Introduce Uint8 compiler data type.

This CL adds all the necessary codegen for the Uint8 type
but does not add code transformations that use that code.
Vectorization codegens are modified to use Uint8 as the
packed type when appropriate. The side effects are now
disconnected from the instruction's type after the graph has
been built to allow changing HArrayGet/H*FieldGet/HVecLoad
to use a type different from the underlying field or array.

Note: HArrayGet for String.charAt() is modified to have
no side effects whatsoever; Strings are immutable.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing --jit
Test: testrunner.py --target --optimizing on Nexus 6P
Test: Nexus 6P boots.
Bug: 23964345
Change-Id: If2dfffedcfb1f50db24570a1e9bd517b3f17bfd0

1 files changed, 7 insertions, 5 deletions

diff --git a/compiler/optimizing/induction_var_range.cc b/compiler/optimizing/induction_var_range.cc
index 92b584cc3b..ab6fbae248 100644
--- a/compiler/optimizing/induction_var_range.cc
+++ b/compiler/optimizing/induction_var_range.cc
@@ -159,9 +159,10 @@ static bool IsConstantValue(InductionVarRange::Value v) {
 /** Corrects a value for type to account for arithmetic wrap-around in lower precision. */
 static InductionVarRange::Value CorrectForType(InductionVarRange::Value v, DataType::Type type) {
   switch (type) {
-    case DataType::Type::kInt16:
+    case DataType::Type::kUint8:
+    case DataType::Type::kInt8:
     case DataType::Type::kUint16:
-    case DataType::Type::kInt8: {
+    case DataType::Type::kInt16: {
       // Constants within range only.
       // TODO: maybe some room for improvement, like allowing widening conversions
       int32_t min = DataType::MinValueOfIntegralType(type);
@@ -216,10 +217,11 @@ bool InductionVarRange::GetInductionRange(HInstruction* context,
   // bounds check elimination, will have truncated higher precision induction
   // at their use point already).
   switch (info->type) {
-    case DataType::Type::kInt32:
-    case DataType::Type::kInt16:
-    case DataType::Type::kUint16:
+    case DataType::Type::kUint8:
     case DataType::Type::kInt8:
+    case DataType::Type::kUint16:
+    case DataType::Type::kInt16:
+    case DataType::Type::kInt32:
       break;
     default:
       return false;