From 344a3780b2e33f6ca763666c380202b18aab72a3 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Thu, 29 Jul 2021 22:15:26 +0200
Subject: Vendor import of llvm-project main 88e66fa60ae5, the last commit
 before the upstream release/13.x branch was created.

---
 .../CodeGen/SelectionDAG/FunctionLoweringInfo.cpp  | 54 ++++++++++++----------
 1 file changed, 30 insertions(+), 24 deletions(-)

(limited to 'llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp')

diff --git a/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp b/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
index 32a4f60df097..85c6eca5775e 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
@@ -192,10 +192,8 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
           MF->getFrameInfo().CreateVariableSizedObject(
               Alignment <= StackAlign ? Align(1) : Alignment, AI);
         }
-      }
-
-      // Look for inline asm that clobbers the SP register.
-      if (auto *Call = dyn_cast<CallBase>(&I)) {
+      } else if (auto *Call = dyn_cast<CallBase>(&I)) {
+        // Look for inline asm that clobbers the SP register.
         if (Call->isInlineAsm()) {
           Register SP = TLI->getStackPointerRegisterToSaveRestore();
           const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
@@ -214,21 +212,20 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
             }
           }
         }
-      }
-
-      // Look for calls to the @llvm.va_start intrinsic. We can omit some
-      // prologue boilerplate for variadic functions that don't examine their
-      // arguments.
-      if (const auto *II = dyn_cast<IntrinsicInst>(&I)) {
-        if (II->getIntrinsicID() == Intrinsic::vastart)
-          MF->getFrameInfo().setHasVAStart(true);
-      }
+        // Look for calls to the @llvm.va_start intrinsic. We can omit some
+        // prologue boilerplate for variadic functions that don't examine their
+        // arguments.
+        if (const auto *II = dyn_cast<IntrinsicInst>(&I)) {
+          if (II->getIntrinsicID() == Intrinsic::vastart)
+            MF->getFrameInfo().setHasVAStart(true);
+        }
 
-      // If we have a musttail call in a variadic function, we need to ensure we
-      // forward implicit register parameters.
-      if (const auto *CI = dyn_cast<CallInst>(&I)) {
-        if (CI->isMustTailCall() && Fn->isVarArg())
-          MF->getFrameInfo().setHasMustTailInVarArgFunc(true);
+        // If we have a musttail call in a variadic function, we need to ensure
+        // we forward implicit register parameters.
+        if (const auto *CI = dyn_cast<CallInst>(&I)) {
+          if (CI->isMustTailCall() && Fn->isVarArg())
+            MF->getFrameInfo().setHasMustTailInVarArgFunc(true);
+        }
       }
 
       // Mark values used outside their block as exported, by allocating
@@ -333,14 +330,23 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
 
   else if (Personality == EHPersonality::Wasm_CXX) {
     WasmEHFuncInfo &EHInfo = *MF->getWasmEHFuncInfo();
-    // Map all BB references in the WinEH data to MBBs.
-    DenseMap<BBOrMBB, BBOrMBB> NewMap;
-    for (auto &KV : EHInfo.EHPadUnwindMap) {
+    // Map all BB references in the Wasm EH data to MBBs.
+    DenseMap<BBOrMBB, BBOrMBB> SrcToUnwindDest;
+    for (auto &KV : EHInfo.SrcToUnwindDest) {
       const auto *Src = KV.first.get<const BasicBlock *>();
-      const auto *Dst = KV.second.get<const BasicBlock *>();
-      NewMap[MBBMap[Src]] = MBBMap[Dst];
+      const auto *Dest = KV.second.get<const BasicBlock *>();
+      SrcToUnwindDest[MBBMap[Src]] = MBBMap[Dest];
+    }
+    EHInfo.SrcToUnwindDest = std::move(SrcToUnwindDest);
+    DenseMap<BBOrMBB, SmallPtrSet<BBOrMBB, 4>> UnwindDestToSrcs;
+    for (auto &KV : EHInfo.UnwindDestToSrcs) {
+      const auto *Dest = KV.first.get<const BasicBlock *>();
+      UnwindDestToSrcs[MBBMap[Dest]] = SmallPtrSet<BBOrMBB, 4>();
+      for (const auto P : KV.second)
+        UnwindDestToSrcs[MBBMap[Dest]].insert(
+            MBBMap[P.get<const BasicBlock *>()]);
     }
-    EHInfo.EHPadUnwindMap = std::move(NewMap);
+    EHInfo.UnwindDestToSrcs = std::move(UnwindDestToSrcs);
   }
 }
 
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