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misched: DAG builder support for tracking register pressure within the current scheduling region.

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The DAG builder is a convenient place to do it. Hopefully this is more
efficient than a separate traversal over the same region.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155456 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-04-24 17:56:43 +00:00
parent 4dfeef100d
commit 006e1abf76
4 changed files with 65 additions and 7 deletions
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3
include/llvm/CodeGen/ScheduleDAGInstrs.h
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@@ -28,6 +28,7 @@ namespace llvm {
class MachineLoopInfo;
class MachineDominatorTree;
class LiveIntervals;
class RegPressureTracker;
/// LoopDependencies - This class analyzes loop-oriented register
/// dependencies, which are used to guide scheduling decisions.
@@ -275,7 +276,7 @@ namespace llvm {
/// buildSchedGraph - Build SUnits from the MachineBasicBlock that we are
/// input.
void buildSchedGraph(AliasAnalysis *AA);
void buildSchedGraph(AliasAnalysis *AA, RegPressureTracker *RPTracker = 0);
/// addSchedBarrierDeps - Add dependencies from instructions in the current
/// list of instructions being scheduled to scheduling barrier. We want to