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[MachineScheduler] Fix for PR21807: minor code difference building with/without -g.

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This patch fixes the issue reported as PR21807. There was a minor difference
in the generated code depending on the -g flag.

The cause was that with -g the machine scheduler used a different
scheduling strategy. This decision was based on the number of instructions
in a schedule region and included debug instructions in that count.

This patch fixes the issue in MISched and provides a test.

Patch by Russell Gallop!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224118 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrea Di Biagio
2014-12-12 12:41:22 +00:00
parent 2a3c63a58f
commit c15d82e259
2 changed files with 93 additions and 1 deletions
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4
lib/CodeGen/MachineScheduler.cpp
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@@ -430,9 +430,11 @@ void MachineSchedulerBase::scheduleRegions(ScheduleDAGInstrs &Scheduler) {
// instruction stream until we find the nearest boundary.
unsigned NumRegionInstrs = 0;
MachineBasicBlock::iterator I = RegionEnd;
for(;I != MBB->begin(); --I, --RemainingInstrs, ++NumRegionInstrs) {
for(;I != MBB->begin(); --I, --RemainingInstrs) {
if (isSchedBoundary(std::prev(I), MBB, MF, TII, IsPostRA))
break;
if (!I->isDebugValue())
++NumRegionInstrs;
}
// Notify the scheduler of the region, even if we may skip scheduling
// it. Perhaps it still needs to be bundled.