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
diff --git a/compiler/optimizing/pc_relative_fixups_x86.cc b/compiler/optimizing/pc_relative_fixups_x86.cc
index d281a9f..dafbd3d 100644
--- a/compiler/optimizing/pc_relative_fixups_x86.cc
+++ b/compiler/optimizing/pc_relative_fixups_x86.cc
@@ -80,6 +80,15 @@
HandleInvoke(invoke);
}
+ void VisitLoadString(HLoadString* load_string) OVERRIDE {
+ HLoadString::LoadKind load_kind = load_string->GetLoadKind();
+ if (load_kind == HLoadString::LoadKind::kBootImageLinkTimePcRelative ||
+ load_kind == HLoadString::LoadKind::kDexCachePcRelative) {
+ InitializePCRelativeBasePointer();
+ load_string->AddSpecialInput(base_);
+ }
+ }
+
void BinaryFP(HBinaryOperation* bin) {
HConstant* rhs = bin->InputAt(1)->AsConstant();
if (rhs != nullptr && Primitive::IsFloatingPointType(rhs->GetType())) {