commit 31b12e32073f458950e96d0d1b44e48508cf67e4
author Mathieu Chartier <mathieuc@google.com> Fri Sep 02 17:11:57 2016 -0700
committer Mathieu Chartier <mathieuc@google.com> Wed Sep 07 10:13:48 2016 -0700
tree b6f818dfa6b45342d6b69283c10e1db9817b8b0e
parent 038cb84f792501ae01561fe5ea4e8144f1918b7e

Avoid read barrier for image HLoadClass

Concurrent copying baker:

X86_64 core-optimizing-pic.oat: 28583112 -> 27906824 (2.4% smaller)

Around 0.4% of 2.4% is from re-enabling kBootImageLinkTimeAddress,
kBootImageLinkTimePcRelative, and kBootImageAddress.

N6P boot.oat 32: 73042140 -> 71891956 (1.57% smaller)
N6P boot.oat 64: 83831608 -> 82531456 (1.55% smaller)

EAAC: 1252 -> 1245 (32 samples)

Bug: 29516974

Test: test-art-host CC baker, N6P booting

Change-Id: I9a196cf0157058836981c43c93872e9f0c4919aa

compiler/optimizing/code_generator_x86_64.h

diff --git a/compiler/optimizing/code_generator_x86_64.h b/compiler/optimizing/code_generator_x86_64.h
index f23bff5..d939083 100644
--- a/compiler/optimizing/code_generator_x86_64.h
+++ b/compiler/optimizing/code_generator_x86_64.h
@@ -257,7 +257,8 @@
   void GenerateGcRootFieldLoad(HInstruction* instruction,
                                Location root,
                                const Address& address,
-                               Label* fixup_label = nullptr);
+                               Label* fixup_label = nullptr,
+                               bool requires_read_barrier = kEmitCompilerReadBarrier);
 
   void PushOntoFPStack(Location source, uint32_t temp_offset,
                        uint32_t stack_adjustment, bool is_float);