Support hardware divide instruction
Bug: 11299025
Uses sdiv for division and a combo of sdiv, mul and sub for modulus.
Only does this on processors that are capable of the sdiv instruction, as determined
by the build system.
Also provides a command line arg --instruction-set-features= to allow cross compilation.
Makefile adds the --instruction-set-features= arg to build-time dex2oat runs and defaults
it to something obtained from the target architecture.
Provides a GetInstructionSetFeatures() function on CompilerDriver that can be
queried for various features. The only feature supported right now is hasDivideInstruction().
Also adds a few more instructions to the ARM disassembler
b/11535253 is an addition to this CL to be done later.
Change-Id: Ia8aaf801fd94bc71e476902749cf20f74eba9f68
diff --git a/runtime/utils.h b/runtime/utils.h
index 51035b6..6850e8b 100644
--- a/runtime/utils.h
+++ b/runtime/utils.h
@@ -252,7 +252,7 @@
// Get the appropriate unit for a nanosecond duration.
TimeUnit GetAppropriateTimeUnit(uint64_t nano_duration);
-// Get the divisor to convert from a nanoseconds to a time unit
+// Get the divisor to convert from a nanoseconds to a time unit.
uint64_t GetNsToTimeUnitDivisor(TimeUnit time_unit);
// Performs JNI name mangling as described in section 11.3 "Linking Native Methods"
@@ -326,6 +326,9 @@
// strings. Empty strings will be omitted.
void Split(const std::string& s, char separator, std::vector<std::string>& result);
+// Trims whitespace off both ends of the given string.
+std::string Trim(std::string s);
+
// Joins a vector of strings into a single string, using the given separator.
template <typename StringT> std::string Join(std::vector<StringT>& strings, char separator);
@@ -354,10 +357,10 @@
// Dumps the kernel stack for thread 'tid' to 'os'. Note that this is only available on linux-x86.
void DumpKernelStack(std::ostream& os, pid_t tid, const char* prefix = "", bool include_count = true);
-// Find $ANDROID_ROOT, /system, or abort
+// Find $ANDROID_ROOT, /system, or abort.
const char* GetAndroidRoot();
-// Find $ANDROID_DATA, /data, or abort
+// Find $ANDROID_DATA, /data, or abort.
const char* GetAndroidData();
// Returns the dalvik-cache location, or dies trying.