Avoid use of std::string where we have const char*.
Removing the ClassHelper caused std::string creation for all calls to
Class::GetDescriptor and a significant performance regression. Make the
std::string an out argument so the caller can maintain it and its life time
while allowing GetDescriptor to return the common const char* case.
Don't generate GC maps when compilation is disabled.
Remove other uses of std::string that are occuring on critical paths.
Use the cheaper SkipClass in CompileMethod in CompilerDriver.
Specialize the utf8 as utf16 comparison code for the common shorter byte
encoding.
Force a bit of inlining, remove some UNLIKELYs (they are prone to pessimizing
code), add some LIKELYs.
x86-64 host 1-thread interpret-only of 57 apks:
Before: 29.539s
After: 23.467s
Regular compile:
Before: 1m35.347s
After: 1m20.056s
Bug: 16853450
Change-Id: Ic705ea24784bee24ab80084d06174cbf87d557ad
diff --git a/runtime/leb128.h b/runtime/leb128.h
index 0e80fe2..89de16e 100644
--- a/runtime/leb128.h
+++ b/runtime/leb128.h
@@ -28,7 +28,7 @@
static inline uint32_t DecodeUnsignedLeb128(const uint8_t** data) {
const uint8_t* ptr = *data;
int result = *(ptr++);
- if (result > 0x7f) {
+ if (UNLIKELY(result > 0x7f)) {
int cur = *(ptr++);
result = (result & 0x7f) | ((cur & 0x7f) << 7);
if (cur > 0x7f) {