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mi-sched: update PressureDiffs on-the-fly for liveness.

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This removes all expensive pressure tracking logic from the scheduling
critical path of node comparison.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189643 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2013-08-30 04:36:57 +00:00
parent 1362dcb589
commit 663bd99227
6 changed files with 97 additions and 31 deletions
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6
include/llvm/CodeGen/MachineScheduler.h
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@ -221,7 +221,9 @@ protected:
MachineBasicBlock::iterator LiveRegionEnd;
// Map each SU to its summary of pressure changes.
// Map each SU to its summary of pressure changes. This array is updated for
// liveness during bottom-up scheduling. Top-down scheduling may proceed but
// has no affect on the pressure diffs.
PressureDiffs SUPressureDiffs;
/// Register pressure in this region computed by initRegPressure.
@ -376,6 +378,8 @@ protected:
void initRegPressure();
void updatePressureDiffs(ArrayRef<unsigned> LiveUses);
void updateScheduledPressure(const std::vector<unsigned> &NewMaxPressure);
bool checkSchedLimit();