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misched: Allow subtargets to enable misched and dependent options.

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This allows me to begin enabling (or backing out) misched by default
for one subtarget at a time. To run misched we typically want to:
- Disable SelectionDAG scheduling (use the source order scheduler)
- Enable more aggressive coalescing (until we decide to always run the coalescer this way)
- Enable MachineScheduler pass itself.

Disabling PostRA sched may follow for some subtargets.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167826 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-11-13 08:47:29 +00:00
parent 265058d923
commit ad1cc1d1bf
6 changed files with 54 additions and 14 deletions
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4
lib/CodeGen/MachineScheduler.cpp
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@ -60,11 +60,11 @@ static cl::opt<unsigned> ILPWindow("ilp-window", cl::Hidden,
// Experimental heuristics
static cl::opt<bool> EnableLoadCluster("misched-cluster", cl::Hidden,
cl::desc("Enable load clustering."));
cl::desc("Enable load clustering."), cl::init(true));
// Experimental heuristics
static cl::opt<bool> EnableMacroFusion("misched-fusion", cl::Hidden,
cl::desc("Enable scheduling for macro fusion."));
cl::desc("Enable scheduling for macro fusion."), cl::init(true));
//===----------------------------------------------------------------------===//
// Machine Instruction Scheduling Pass and Registry