[PATCH] D110542: [LiveIntervals] Remove unused subreg ranges in repairIntervalsInRange

[Jay Foad via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG156d7d2df748: [LiveIntervals] Remove unused subreg ranges in repairIntervalsInRange (authored by foad).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D110542/new/

https://reviews.llvm.org/D110542

Files:
  llvm/lib/CodeGen/LiveIntervals.cpp
  llvm/test/CodeGen/AMDGPU/dead-lane.mir
  llvm/test/CodeGen/Thumb2/mve-sext-masked-load.ll


Index: llvm/test/CodeGen/Thumb2/mve-sext-masked-load.ll
===================================================================
--- llvm/test/CodeGen/Thumb2/mve-sext-masked-load.ll
+++ llvm/test/CodeGen/Thumb2/mve-sext-masked-load.ll
@@ -1,5 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=thumbv8.1m.main-none-none-eabi -mattr=+mve.fp,+fp64 -verify-machineinstrs -o - %s | FileCheck %s
+; RUN: llc -mtriple=thumbv8.1m.main-none-none-eabi -mattr=+mve.fp,+fp64 -verify-machineinstrs -early-live-intervals -o - %s | FileCheck %s
 
 define arm_aapcs_vfpcc <4 x float> @foo_v4i16(<4 x i16>* nocapture readonly %pSrc, i32 %blockSize, <4 x i16> %a) {
 ; CHECK-LABEL: foo_v4i16:
Index: llvm/test/CodeGen/AMDGPU/dead-lane.mir
===================================================================
--- llvm/test/CodeGen/AMDGPU/dead-lane.mir
+++ llvm/test/CodeGen/AMDGPU/dead-lane.mir
@@ -1,4 +1,5 @@
 # RUN: llc -march=amdgcn -mcpu=tonga %s -start-before detect-dead-lanes -stop-before machine-scheduler -verify-machineinstrs -o - | FileCheck -check-prefix=GCN %s
+# RUN: llc -march=amdgcn -mcpu=tonga %s -start-before detect-dead-lanes -stop-before machine-scheduler -verify-machineinstrs -early-live-intervals -o - | FileCheck -check-prefix=GCN %s
 
 # GCN-LABEL: name: dead_lane
 # GCN:      bb.0:
Index: llvm/lib/CodeGen/LiveIntervals.cpp
===================================================================
--- llvm/lib/CodeGen/LiveIntervals.cpp
+++ llvm/lib/CodeGen/LiveIntervals.cpp
@@ -1655,6 +1655,10 @@
       }
     }
   }
+
+  bool isStartValid = getInstructionFromIndex(LII->start);
+  if (!isStartValid && LII->end.isDead())
+    LR.removeSegment(*LII, true);
 }
 
 void
@@ -1716,6 +1720,7 @@
 
     for (LiveInterval::SubRange &S : LI.subranges())
       repairOldRegInRange(Begin, End, EndIdx, S, Reg, S.LaneMask);
+    LI.removeEmptySubRanges();
 
     repairOldRegInRange(Begin, End, EndIdx, LI, Reg);
   }


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