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8147844: new method j.l.Runtime.onSpinWait() and the corresponding x86 hotspot instrinsic

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Adds c1 & c2 x86 intrinsics for j.l.Runtime.onSpinWait() that utilize the PAUSE instruction

Co-authored-by: Yuri Gaevsky <ygaevsky@azul.com>
Reviewed-by: iveresov, kvn
This commit is contained in:
Ivan Krylov 2016-03-30 17:04:14 +02:00 • committed by Ivan P Krylov
parent cf5871861f
commit 429b1c80a1
22 changed files with 172 additions and 1 deletions
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3
hotspot/src/share/vm/c1/c1_Compiler.cpp
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@ -131,6 +131,9 @@ bool Compiler::is_intrinsic_supported(const methodHandle& method) {
if (!VM_Version::supports_atomic_getset4()) return false;
#endif
break;
case vmIntrinsics::_onSpinWait:
if (!VM_Version::supports_on_spin_wait()) return false;
break;
case vmIntrinsics::_arraycopy:
case vmIntrinsics::_currentTimeMillis:
case vmIntrinsics::_nanoTime: