[PruneEH] FuncletPads must not have undef operands

Instead of RAUW with undef, replace the first non-token instruction with
unreachable.

This fixes PR26263.

llvm-svn: 258611

1 files changed, 30 insertions, 0 deletions

diff --git a/llvm/test/Transforms/PruneEH/pr26263.ll b/llvm/test/Transforms/PruneEH/pr26263.ll
new file mode 100644
index 00000000000..3670f00d811
--- /dev/null
+++ b/llvm/test/Transforms/PruneEH/pr26263.ll
@@ -0,0 +1,30 @@
+; RUN: opt -prune-eh -S < %s | FileCheck %s
+target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
+target triple = "i386-pc-windows-msvc"
+
+declare void @neverthrows() nounwind
+
+define void @test1() personality i32 (...)* @__CxxFrameHandler3 {
+  invoke void @neverthrows()
+          to label %try.cont unwind label %cleanuppad
+
+try.cont:
+  ret void
+
+cleanuppad:
+  %cp = cleanuppad within none []
+  br label %cleanupret
+
+cleanupret:
+  cleanupret from %cp unwind to caller
+}
+
+; CHECK-LABEL: define void @test1(
+; CHECK: call void @neverthrows()
+
+; CHECK: %[[cp:.*]] = cleanuppad within none []
+; CHECK-NEXT: unreachable
+
+; CHECK: cleanupret from %[[cp]] unwind to caller
+
+declare i32 @__CxxFrameHandler3(...)