// Debug info intrinsics do not get in the way of tail call optimization.
if (isa<DbgInfoIntrinsic>(BBI))
continue;
+ // A lifetime end intrinsic should not stop tail call optimization.
+ if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(BBI))
+ if (II->getIntrinsicID() == Intrinsic::lifetime_end)
+ continue;
if (BBI->mayHaveSideEffects() || BBI->mayReadFromMemory() ||
!isSafeToSpeculativelyExecute(&*BBI))
return false;
--- /dev/null
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu -o - %s | FileCheck %s
+
+; A lifetime end intrinsic should not prevent a call from being tail call
+; optimized.
+
+define void @foobar() {
+; CHECK-LABEL: foobar
+; CHECK: pushq %rax
+; CHECK: leaq 4(%rsp), %rdi
+; CHECK: callq foo
+; CHECK: popq %rax
+; CHECK: jmp bar
+entry:
+ %i = alloca i32
+ %0 = bitcast i32* %i to i8*
+ call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %0)
+ call void @foo(i32* nonnull %i)
+ tail call void @bar()
+ call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %0)
+ ret void
+}
+
+declare void @foo(i32* nocapture %p)
+declare void @bar()
+
+declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture)
+declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)