AMDGPU: Fix iterator crash in AMDGPUPromoteAlloca

The lifetime intrinsic was erased, which was the next iterator.

llvm-svn: 363668

1 files changed, 9 insertions, 5 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp b/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
index a2d62c73404..e4c9d6685d4 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
@@ -162,12 +162,16 @@ bool AMDGPUPromoteAlloca::runOnFunction(Function &F) {
   bool SufficientLDS = hasSufficientLocalMem(F);
   bool Changed = false;
   BasicBlock &EntryBB = *F.begin();
-  for (auto I = EntryBB.begin(), E = EntryBB.end(); I != E; ) {
-    AllocaInst *AI = dyn_cast<AllocaInst>(I);
 
-    ++I;
-    if (AI)
-      Changed |= handleAlloca(*AI, SufficientLDS);
+  SmallVector<AllocaInst *, 16> Allocas;
+  for (Instruction &I : EntryBB) {
+    if (AllocaInst *AI = dyn_cast<AllocaInst>(&I))
+      Allocas.push_back(AI);
+  }
+
+  for (AllocaInst *AI : Allocas) {
+    if (handleAlloca(*AI, SufficientLDS))
+      Changed = true;
   }
 
   return Changed;