From 4ccb89c71fdc3d33681e292f42e49d8527cb9d7f Mon Sep 17 00:00:00 2001
From: Nuno Lopes <nunoplopes@sapo.pt>
Date: Mon, 2 Jul 2012 16:14:47 +0000
Subject: [PATCH] fix the regression I introduced in r159385 (it's necessary to
 update PHI nodes in unwind BB

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159534 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/SimplifyCFGPass.cpp |  3 +++
 test/Transforms/SimplifyCFG/invoke.ll     | 33 +++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/lib/Transforms/Scalar/SimplifyCFGPass.cpp b/lib/Transforms/Scalar/SimplifyCFGPass.cpp
index bdcf9887b7c..91158b429ea 100644
--- a/lib/Transforms/Scalar/SimplifyCFGPass.cpp
+++ b/lib/Transforms/Scalar/SimplifyCFGPass.cpp
@@ -99,6 +99,9 @@ static void ChangeToCall(InvokeInst *II) {
 
   // Follow the call by a branch to the normal destination.
   BranchInst::Create(II->getNormalDest(), II);
+
+  // Update PHI nodes in the unwind destination
+  II->getUnwindDest()->removePredecessor(II->getParent());
   II->eraseFromParent();
 }
 
diff --git a/test/Transforms/SimplifyCFG/invoke.ll b/test/Transforms/SimplifyCFG/invoke.ll
index 18c6b8e4802..ddced6b94df 100644
--- a/test/Transforms/SimplifyCFG/invoke.ll
+++ b/test/Transforms/SimplifyCFG/invoke.ll
@@ -4,6 +4,8 @@ target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f3
 declare i32 @__gxx_personality_v0(...)
 declare void @__cxa_call_unexpected(i8*)
 declare i32 @read_only() nounwind readonly
+declare i32 @nounwind_fn() nounwind
+declare i32 @fn()
 
 
 ; CHECK: @f1
@@ -82,3 +84,34 @@ lpad:
   tail call void @__cxa_call_unexpected(i8* %1) noreturn nounwind
   unreachable
 }
+
+; CHECK: @f5
+define i32 @f5(i1 %cond, i8* %a, i8* %b) {
+entry:
+  br i1 %cond, label %x, label %y
+
+x:
+; CHECK: invoke i32 @fn()
+  %call = invoke i32 @fn()
+          to label %cont unwind label %lpad
+
+y:
+; CHECK: call i32 @nounwind_fn()
+  %call2 = invoke i32 @nounwind_fn()
+           to label %cont unwind label %lpad
+
+cont:
+; CHECK: phi i32
+; CHECK: ret i32 %phi
+  %phi = phi i32 [%call, %x], [%call2, %y]
+  ret i32 %phi
+
+lpad:
+; CHECK-NOT: phi
+  %phi2 = phi i8* [%a, %x], [%b, %y]
+  %0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
+          filter [0 x i8*] zeroinitializer
+; CHECK: __cxa_call_unexpected(i8* %a)
+  tail call void @__cxa_call_unexpected(i8* %phi2) noreturn nounwind
+  unreachable
+}
-- 
2.34.1