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R600/SI: Insert s_waitcnt before s_barrier instructions.

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This ensures that all memory operations are complete when all threads
reach the barrier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225290 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard
2015-01-06 19:52:07 +00:00
parent fad04531a9
commit bac89f3dd2
3 changed files with 10 additions and 1 deletions
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6
lib/Target/R600/SIInsertWaits.cpp
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@@ -428,7 +428,11 @@ bool SIInsertWaits::runOnMachineFunction(MachineFunction &MF) {
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
I != E; ++I) {
Changes |= insertWait(MBB, I, handleOperands(*I));
// Wait for everything before a barrier.
if (I->getOpcode() == AMDGPU::S_BARRIER)
Changes |= insertWait(MBB, I, LastIssued);
else
Changes |= insertWait(MBB, I, handleOperands(*I));
pushInstruction(MBB, I);
}