vendor/llvm-project/llvmorg-14-init-13186-g0c553cc1af2e

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
index ec926b1f5a94..ecad79b68185 100644
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -402,6 +402,18 @@ bool llvm::isInstructionTriviallyDead(Instruction *I,
   return wouldInstructionBeTriviallyDead(I, TLI);
 }
 
+bool llvm::wouldInstructionBeTriviallyDeadOnUnusedPaths(
+    Instruction *I, const TargetLibraryInfo *TLI) {
+  // Instructions that are "markers" and have implied meaning on code around
+  // them (without explicit uses), are not dead on unused paths.
+  if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(I))
+    if (II->getIntrinsicID() == Intrinsic::stacksave ||
+        II->getIntrinsicID() == Intrinsic::launder_invariant_group ||
+        II->isLifetimeStartOrEnd())
+      return false;
+  return wouldInstructionBeTriviallyDead(I, TLI);
+}
+
 bool llvm::wouldInstructionBeTriviallyDead(Instruction *I,
                                            const TargetLibraryInfo *TLI) {
   if (I->isTerminator())