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Enable improved spilling costs by default. This speeds up viterbi on x86
by 40%, FreeBench/fourinarow by 20%, and many other programs 10-25%. On PPC, this speeds up fourinarow by 18%, and probably other things as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31504 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -59,9 +59,6 @@ namespace {
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EnableJoining("join-liveintervals",
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cl::desc("Coallesce copies (default=true)"),
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cl::init(true));
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static cl::opt<bool>
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EnableReweight("enable-majik-f00");
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}
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void LiveIntervals::getAnalysisUsage(AnalysisUsage &AU) const {
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@ -221,16 +218,14 @@ bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) {
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if (isZeroLengthInterval(&LI))
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LI.weight = HUGE_VALF;
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if (EnableReweight) {
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// Divide the weight of the interval by its size. This encourages
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// spilling of intervals that are large and have few uses, and
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// discourages spilling of small intervals with many uses.
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unsigned Size = 0;
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for (LiveInterval::iterator II = LI.begin(), E = LI.end(); II != E;++II)
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Size += II->end - II->start;
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// Divide the weight of the interval by its size. This encourages
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// spilling of intervals that are large and have few uses, and
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// discourages spilling of small intervals with many uses.
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unsigned Size = 0;
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for (LiveInterval::iterator II = LI.begin(), E = LI.end(); II != E;++II)
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Size += II->end - II->start;
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LI.weight /= Size;
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}
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LI.weight /= Size;
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}
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}
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