From 0aabe661a4315def30ddb2b4dbf290b513ffb747 Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Thu, 20 Feb 2014 23:00:15 +0000
Subject: [PATCH] =?UTF-8?q?Make=20sure=20that=20value=20handle=20users=20s?=
 =?UTF-8?q?ee=20the=20transformation=20of=20an=20indirect=20call=20to=20a?=
 =?UTF-8?q?=20direct=20call.=20This=20is=20important=20for=20the=20CallGra?=
 =?UTF-8?q?ph=20iteration.=20Patch=20by=20Bj=C3=B6rn=20Steinbrink!?=
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201822 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../InstCombine/InstCombineCalls.cpp          |  2 ++
 .../InstCombine/cast-call-combine.ll          | 23 +++++++++++++++++++
 2 files changed, 25 insertions(+)
 create mode 100644 test/Transforms/InstCombine/cast-call-combine.ll

diff --git a/lib/Transforms/InstCombine/InstCombineCalls.cpp b/lib/Transforms/InstCombine/InstCombineCalls.cpp
index 9e8d1bc3bd6..fe8c1b0baf6 100644
--- a/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -1212,6 +1212,8 @@ bool InstCombiner::transformConstExprCastCall(CallSite CS) {
 
   if (!Caller->use_empty())
     ReplaceInstUsesWith(*Caller, NV);
+  else if (Caller->hasValueHandle())
+    ValueHandleBase::ValueIsRAUWd(Caller, NV);
 
   EraseInstFromFunction(*Caller);
   return true;
diff --git a/test/Transforms/InstCombine/cast-call-combine.ll b/test/Transforms/InstCombine/cast-call-combine.ll
new file mode 100644
index 00000000000..be70a8763ea
--- /dev/null
+++ b/test/Transforms/InstCombine/cast-call-combine.ll
@@ -0,0 +1,23 @@
+; RUN: opt < %s -always-inline -instcombine -S | FileCheck %s
+
+define internal void @foo(i16*) alwaysinline {
+  ret void
+}
+
+define void @bar() noinline noreturn {
+  unreachable
+}
+
+define void @test() {
+  br i1 false, label %then, label %else
+
+then:
+  call void @bar()
+  unreachable
+
+else:
+  ; CHECK-NOT: call
+  call void bitcast (void (i16*)* @foo to void (i8*)*) (i8* null)
+  ret void
+}
+