[llvm-branch-commits] [llvm] [AMDGPU] Apply occupancy-aware register allocation anti-hints (PR #218074)

[Syadus Sefat via llvm-branch-commits]

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@@ -4173,6 +4177,144 @@ bool SIRegisterInfo::getRegAllocationHints(Register VirtReg,
   }
 }
 
+bool SIRegisterInfo::shouldApplyAntiHints(
+    const MachineFunction &MF, unsigned NumAllocatedVGPRs,
+    unsigned &MaxVGPRsForCurrentOccupancy) const {
+
+  const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
+  unsigned DynamicVGPRBlockSize = MFI->getDynamicVGPRBlockSize();
+  unsigned RecordedMaxOccupancy = MFI->getOccupancy();
+  unsigned CurrentOccupancy =
+      ST.getOccupancyWithNumVGPRs(NumAllocatedVGPRs, DynamicVGPRBlockSize);
+  MaxVGPRsForCurrentOccupancy =
+      ST.getMaxNumVGPRs(CurrentOccupancy, DynamicVGPRBlockSize);
+
+  LLVM_DEBUG(dbgs() << "anti-hints: " << NumAllocatedVGPRs
+                    << " VGPRs allocated, RecordedMaxOccupancy "
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mssefat wrote:

Fixed it.

https://github.com/llvm/llvm-project/pull/218074