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8186027: C2: loop strip mining

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Reviewed-by: kvn, neliasso
This commit is contained in:
Roland Westrelin 2017-11-28 11:59:16 +01:00
parent 46f665881f
commit 386e258e20
17 changed files with 1150 additions and 209 deletions
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15
src/hotspot/share/runtime/arguments.cpp
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@ -2207,6 +2207,21 @@ bool Arguments::check_vm_args_consistency() {
}
FLAG_SET_CMDLINE(bool, PostLoopMultiversioning, false);
}
if (UseCountedLoopSafepoints && LoopStripMiningIter == 0) {
if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
warning("When counted loop safepoints are enabled, LoopStripMiningIter must be at least 1 (a safepoint every 1 iteration): setting it to 1");
}
LoopStripMiningIter = 1;
} else if (!UseCountedLoopSafepoints && LoopStripMiningIter > 0) {
if (!FLAG_IS_DEFAULT(UseCountedLoopSafepoints) || !FLAG_IS_DEFAULT(LoopStripMiningIter)) {
warning("Disabling counted safepoints implies no loop strip mining: setting LoopStripMiningIter to 0");
}
LoopStripMiningIter = 0;
}
if (FLAG_IS_DEFAULT(LoopStripMiningIterShortLoop)) {
// blind guess
LoopStripMiningIterShortLoop = LoopStripMiningIter / 10;
}
#endif
return status;
}