commit 02b75806a80f8b75c3d6ba2ff97c995117630f36
author Roland Levillain <rpl@google.com> Wed Jul 13 11:54:35 2016 +0100
committer Roland Levillain <rpl@google.com> Wed Jul 13 11:54:35 2016 +0100
tree ecdb1852c3e33f120110091cc2d07a9737fbd3b5
parent 5f485719b166ceb8e591329d40e76c5e50988022

Introduce more compact ReadBarrierMark slow-paths.

Replace entry point ReadBarrierMark with 32
ReadBarrierMarkRegX entry points, using register
number X as input and output (instead of the standard
runtime calling convention) to save two moves in Baker's
read barrier mark slow-path code.

Test: ART host and target (ARM, ARM64) tests.
Bug: 29506760
Bug: 12687968
Change-Id: I73cfb82831cf040b8b018e984163c865cc44ed87

runtime/thread.cc

diff --git a/runtime/thread.cc b/runtime/thread.cc
index b9ee442..50f76da 100644
--- a/runtime/thread.cc
+++ b/runtime/thread.cc
@@ -2574,7 +2574,38 @@
   QUICK_ENTRY_POINT_INFO(pNewStringFromStringBuffer)
   QUICK_ENTRY_POINT_INFO(pNewStringFromStringBuilder)
   QUICK_ENTRY_POINT_INFO(pReadBarrierJni)
-  QUICK_ENTRY_POINT_INFO(pReadBarrierMark)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg00)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg01)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg02)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg03)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg04)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg05)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg06)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg07)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg08)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg09)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg10)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg11)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg12)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg13)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg14)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg15)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg16)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg17)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg18)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg19)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg20)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg21)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg22)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg23)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg24)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg25)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg26)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg27)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg28)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg29)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg30)
+  QUICK_ENTRY_POINT_INFO(pReadBarrierMarkReg31)
   QUICK_ENTRY_POINT_INFO(pReadBarrierSlow)
   QUICK_ENTRY_POINT_INFO(pReadBarrierForRootSlow)
 #undef QUICK_ENTRY_POINT_INFO