[AMDGPU] Don't skip regions in getRegionLiveInMap #151423
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Change-Id: If8c3fe02d56aa390f921123e02443386cbc600a1
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@llvm/pr-subscribers-backend-amdgpu Author: Jeffrey Byrnes (jrbyrnes) ChangesCurrently, this skips any region that is not the first region in a block. This is because the only user of it only cares about the LiveIns per-block. However, as named, this is supposed to compute the per-region LiveIns. This doesn't have any effect on scheduling / CodeGen currently (aside from computing LiveIns for all regions) since only the per-block LiveIns are needed. However, I'm working on something that will use this. Intended User: Full diff: https://github.com/llvm/llvm-project/pull/151423.diff 1 Files Affected:
diff --git a/llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp b/llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
index ce1ce687d0038..33b66a63300f0 100644
--- a/llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
+++ b/llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
@@ -896,15 +896,10 @@ GCNScheduleDAGMILive::getRegionLiveInMap() const {
assert(!Regions.empty());
std::vector<MachineInstr *> RegionFirstMIs;
RegionFirstMIs.reserve(Regions.size());
- auto I = Regions.rbegin(), E = Regions.rend();
- do {
- const MachineBasicBlock *MBB = I->first->getParent();
- auto *MI = &*skipDebugInstructionsForward(I->first, I->second);
- RegionFirstMIs.push_back(MI);
- do {
- ++I;
- } while (I != E && I->first->getParent() == MBB);
- } while (I != E);
+ for (auto &[RegionBegin, RegionEnd] : reverse(Regions))
+ RegionFirstMIs.push_back(
+ &*skipDebugInstructionsForward(RegionBegin, RegionEnd));
+
return getLiveRegMap(RegionFirstMIs, /*After=*/false, *LIS);
}
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vpykhtin
approved these changes
Jul 31, 2025
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/11/builds/20832 Here is the relevant piece of the build log for the reference |
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/195/builds/12626 Here is the relevant piece of the build log for the reference |
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Currently, this skips any region that is not the first region in a block. This is because the only user of it only cares about the LiveIns per-block. However, as named, this is supposed to compute the per-region LiveIns.
This doesn't have any effect on scheduling / CodeGen currently (aside from computing LiveIns for all regions) since only the per-block LiveIns are needed. However, I'm working on something that will use this.
Intended User:
#149367
llvm-project/llvm/lib/Target/AMDGPU/GCNSchedStrategy.cpp
Line 1351 in c62a2f1