[Hexagon] Do not cache alloca instructions during isel

They can be deleted or replicated, so the cache may become outdated.
They only need to be visited once during frame lowering, so just scan
the function instead.

llvm-svn: 279297

1 files changed, 5 insertions, 2 deletions

diff --git a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
index cc1fdd4fbf2..644c643d066 100644
--- a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
@@ -532,8 +532,11 @@ void HexagonFrameLowering::insertPrologueInBlock(MachineBasicBlock &MBB,
   unsigned MaxCF = MFI.getMaxCallFrameSize();
   MachineBasicBlock::iterator InsertPt = MBB.begin();
 
-  auto *FuncInfo = MF.getInfo<HexagonMachineFunctionInfo>();
-  auto &AdjustRegs = FuncInfo->getAllocaAdjustInsts();
+  SmallVector<MachineInstr *, 4> AdjustRegs;
+  for (auto &MBB : MF)
+    for (auto &MI : MBB)
+      if (MI.getOpcode() == Hexagon::PS_alloca)
+        AdjustRegs.push_back(&MI);
 
   for (auto MI : AdjustRegs) {
     assert((MI->getOpcode() == Hexagon::PS_alloca) && "Expected alloca");