vendor/llvm-project/llvmorg-13-init-16847-g88e66fa60ae5vendor/llvm-project/llvmorg-12.0.1-rc2-0-ge7dac564cd0evendor/llvm-project/llvmorg-12.0.1-0-gfed41342a82f

1 files changed, 10 insertions, 8 deletions

diff --git a/llvm/lib/CodeGen/MachineLoopInfo.cpp b/llvm/lib/CodeGen/MachineLoopInfo.cpp
index 78480d0e1488..8f91a5b698d0 100644
--- a/llvm/lib/CodeGen/MachineLoopInfo.cpp
+++ b/llvm/lib/CodeGen/MachineLoopInfo.cpp
@@ -115,8 +115,8 @@ DebugLoc MachineLoop::getStartLoc() const {
 }
 
 MachineBasicBlock *
-MachineLoopInfo::findLoopPreheader(MachineLoop *L,
-                                   bool SpeculativePreheader) const {
+MachineLoopInfo::findLoopPreheader(MachineLoop *L, bool SpeculativePreheader,
+                                   bool FindMultiLoopPreheader) const {
   if (MachineBasicBlock *PB = L->getLoopPreheader())
     return PB;
 
@@ -139,12 +139,14 @@ MachineLoopInfo::findLoopPreheader(MachineLoop *L,
 
   // Check if the preheader candidate is a successor of any other loop
   // headers. We want to avoid having two loop setups in the same block.
-  for (MachineBasicBlock *S : Preheader->successors()) {
-    if (S == HB)
-      continue;
-    MachineLoop *T = getLoopFor(S);
-    if (T && T->getHeader() == S)
-      return nullptr;
+  if (!FindMultiLoopPreheader) {
+    for (MachineBasicBlock *S : Preheader->successors()) {
+      if (S == HB)
+        continue;
+      MachineLoop *T = getLoopFor(S);
+      if (T && T->getHeader() == S)
+        return nullptr;
+    }
   }
   return Preheader;
 }