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[MIScheduler] Slightly better handling of constrainLocalCopy when both source and dest are local

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This fixes PR21792.

Differential Revision: http://reviews.llvm.org/D6823

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226433 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Kuperstein
2015-01-19 07:30:47 +00:00
parent d1f1656447
commit 5a0c8601d3
4 changed files with 61 additions and 21 deletions
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11
lib/CodeGen/MachineScheduler.cpp
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@ -1434,12 +1434,15 @@ void CopyConstrain::constrainLocalCopy(SUnit *CopySU, ScheduleDAGMILive *DAG) {
// Check if either the dest or source is local. If it's live across a back
// edge, it's not local. Note that if both vregs are live across the back
// edge, we cannot successfully contrain the copy without cyclic scheduling.
unsigned LocalReg = DstReg;
unsigned GlobalReg = SrcReg;
// If both the copy's source and dest are local live intervals, then we
// should treat the dest as the global for the purpose of adding
// constraints. This adds edges from source's other uses to the copy.
unsigned LocalReg = SrcReg;
unsigned GlobalReg = DstReg;
LiveInterval *LocalLI = &LIS->getInterval(LocalReg);
if (!LocalLI->isLocal(RegionBeginIdx, RegionEndIdx)) {
LocalReg = SrcReg;
GlobalReg = DstReg;
LocalReg = DstReg;
GlobalReg = SrcReg;
LocalLI = &LIS->getInterval(LocalReg);
if (!LocalLI->isLocal(RegionBeginIdx, RegionEndIdx))
return;