289 }
290 if (FLAG_IS_DEFAULT(Tier3CompileThreshold)) {
291 Tier3CompileThreshold = 5000;
292 }
293 if (FLAG_IS_DEFAULT(Tier3MinInvocationThreshold)) {
294 Tier3MinInvocationThreshold = 500;
295 }
296
297 FLAG_SET_DEFAULT(TypeProfileLevel, 0); // unsupported
298
299 // This machine does not allow unaligned memory accesses
300 if (UseUnalignedAccesses) {
301 if (!FLAG_IS_DEFAULT(UseUnalignedAccesses))
302 warning("Unaligned memory access is not available on this CPU");
303 FLAG_SET_DEFAULT(UseUnalignedAccesses, false);
304 }
305
306 _is_initialized = true;
307 }
308
309 bool VM_Version::use_biased_locking() {
310 get_os_cpu_info();
311 // The cost of CAS on uniprocessor ARM v6 and later is low compared to the
312 // overhead related to slightly longer Biased Locking execution path.
313 // Testing shows no improvement when running with Biased Locking enabled
314 // on an ARMv6 and higher uniprocessor systems. The situation is different on
315 // ARMv5 and MP systems.
316 //
317 // Therefore the Biased Locking is enabled on ARMv5 and ARM MP only.
318 //
319 return (!os::is_MP() && (arm_arch() > 5)) ? false : true;
320 }
321
322 #define EXP
323
324 // Temporary override for experimental features
325 // Copied from Abstract_VM_Version
326 const char* VM_Version::vm_info_string() {
327 switch (Arguments::mode()) {
328 case Arguments::_int:
329 return UseSharedSpaces ? "interpreted mode, sharing" EXP : "interpreted mode" EXP;
330 case Arguments::_mixed:
331 return UseSharedSpaces ? "mixed mode, sharing" EXP : "mixed mode" EXP;
332 case Arguments::_comp:
333 return UseSharedSpaces ? "compiled mode, sharing" EXP : "compiled mode" EXP;
334 };
335 ShouldNotReachHere();
336 return "";
337 }
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289 }
290 if (FLAG_IS_DEFAULT(Tier3CompileThreshold)) {
291 Tier3CompileThreshold = 5000;
292 }
293 if (FLAG_IS_DEFAULT(Tier3MinInvocationThreshold)) {
294 Tier3MinInvocationThreshold = 500;
295 }
296
297 FLAG_SET_DEFAULT(TypeProfileLevel, 0); // unsupported
298
299 // This machine does not allow unaligned memory accesses
300 if (UseUnalignedAccesses) {
301 if (!FLAG_IS_DEFAULT(UseUnalignedAccesses))
302 warning("Unaligned memory access is not available on this CPU");
303 FLAG_SET_DEFAULT(UseUnalignedAccesses, false);
304 }
305
306 _is_initialized = true;
307 }
308
309 #define EXP
310
311 // Temporary override for experimental features
312 // Copied from Abstract_VM_Version
313 const char* VM_Version::vm_info_string() {
314 switch (Arguments::mode()) {
315 case Arguments::_int:
316 return UseSharedSpaces ? "interpreted mode, sharing" EXP : "interpreted mode" EXP;
317 case Arguments::_mixed:
318 return UseSharedSpaces ? "mixed mode, sharing" EXP : "mixed mode" EXP;
319 case Arguments::_comp:
320 return UseSharedSpaces ? "compiled mode, sharing" EXP : "compiled mode" EXP;
321 };
322 ShouldNotReachHere();
323 return "";
324 }
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