Optimizing: Improve const-string code generation.

For strings in the boot image, use either direct pointers
or pc-relative addresses. For other strings, use PC-relative
access to the dex cache arrays for AOT and direct address of
the string's dex cache slot for JIT.

For aosp_flounder-userdebug:
  - 32-bit boot.oat: -692KiB (-0.9%)
  - 64-bit boot.oat: -948KiB (-1.1%)
  - 32-bit dalvik cache total: -900KiB (-0.9%)
  - 64-bit dalvik cache total: -3672KiB (-1.5%)
    (contains more files than the 32-bit dalvik cache)
For aosp_flounder-userdebug forced to compile PIC:
  - 32-bit boot.oat: -380KiB (-0.5%)
  - 64-bit boot.oat: -928KiB (-1.0%)
  - 32-bit dalvik cache total: -468KiB (-0.4%)
  - 64-bit dalvik cache total: -1928KiB (-0.8%)
    (contains more files than the 32-bit dalvik cache)

Bug: 26884697
Change-Id: Iec7266ce67e6fedc107be78fab2e742a8dab2696

1 files changed, 1 insertions, 0 deletions

diff --git a/compiler/optimizing/sharpening.h b/compiler/optimizing/sharpening.h
index adae7007dd..24152f6b71 100644
--- a/compiler/optimizing/sharpening.h
+++ b/compiler/optimizing/sharpening.h
@@ -47,6 +47,7 @@ class HSharpening : public HOptimization {
 
  private:
   void ProcessInvokeStaticOrDirect(HInvokeStaticOrDirect* invoke);
+  void ProcessLoadString(HLoadString* load_string);
 
   CodeGenerator* codegen_;
   const DexCompilationUnit& compilation_unit_;