1 files changed, 9 insertions, 1 deletions
diff --git a/llvm/lib/Target/AMDGPU/GCNRegPressure.h b/llvm/lib/Target/AMDGPU/GCNRegPressure.h
index 5862cdb041669..2ef79410719f6 100644
--- a/llvm/lib/Target/AMDGPU/GCNRegPressure.h
+++ b/llvm/lib/Target/AMDGPU/GCNRegPressure.h
@@ -5,6 +5,14 @@
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file defines the GCNRegPressure class, which tracks registry pressure
+/// by bookkeeping number of SGPR/VGPRs used, weights for large SGPR/VGPRs. It
+/// also implements a compare function, which compares different register
+/// pressures, and declares one with max occupance as winner.
+///
+//===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_TARGET_AMDGPU_GCNREGPRESSURE_H
 #define LLVM_LIB_TARGET_AMDGPU_GCNREGPRESSURE_H
@@ -208,7 +216,7 @@ getLiveRegMap(Range &&R, bool After, LiveIntervals &LIS) {
     auto SI = SII.getInstructionIndex(*I);
     Indexes.push_back(After ? SI.getDeadSlot() : SI.getBaseIndex());
   }
-  std::sort(Indexes.begin(), Indexes.end());
+  llvm::sort(Indexes);
 
   auto &MRI = (*R.begin())->getParent()->getParent()->getRegInfo();
   DenseMap<MachineInstr *, GCNRPTracker::LiveRegSet> LiveRegMap;