From f31627f676374812d0355d7e34fd2e940b400757 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 23 Jul 2008 06:31:27 +0000
Subject: [PATCH] Fix a codegen crash on:

int foo(void) {
  float x[2];
  return x;
}

rdar://6093986


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@53946 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CGExprScalar.cpp  | 16 ++++++++++------
 test/CodeGen/pointer-to-int.c |  9 ++++++++-
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/lib/CodeGen/CGExprScalar.cpp b/lib/CodeGen/CGExprScalar.cpp
index f3ac6a61f4..5a75e53669 100644
--- a/lib/CodeGen/CGExprScalar.cpp
+++ b/lib/CodeGen/CGExprScalar.cpp
@@ -533,12 +533,16 @@ Value *ScalarExprEmitter::VisitImplicitCastExpr(const ImplicitCastExpr *E) {
     V = Builder.CreateStructGEP(V, 0, "arraydecay");
     
     // The resultant pointer type can be implicitly casted to other pointer
-    // types as well, for example void*.
-    const llvm::Type *DestPTy = ConvertType(E->getType());
-    assert(isa<llvm::PointerType>(DestPTy) &&
-           "Only expect implicit cast to pointer");
-    if (V->getType() != DestPTy)
-      V = Builder.CreateBitCast(V, DestPTy, "ptrconv");
+    // types as well (e.g. void*) and can be implicitly converted to integer.
+    const llvm::Type *DestTy = ConvertType(E->getType());
+    if (V->getType() != DestTy) {
+      if (isa<llvm::PointerType>(DestTy))
+        V = Builder.CreateBitCast(V, DestTy, "ptrconv");
+      else {
+        assert(isa<llvm::IntegerType>(DestTy) && "Unknown array decay");
+        V = Builder.CreatePtrToInt(V, DestTy, "ptrconv");
+      }
+    }
     return V;
     
   } else if (E->getType()->isReferenceType()) {
diff --git a/test/CodeGen/pointer-to-int.c b/test/CodeGen/pointer-to-int.c
index 7599e0d4ab..a3eaf91bc1 100644
--- a/test/CodeGen/pointer-to-int.c
+++ b/test/CodeGen/pointer-to-int.c
@@ -1,6 +1,13 @@
-// RUN: clang -emit-llvm %s
+// RUN: clang -emit-llvm %s -o -
 
 int test(void* i)
 {
   return (int)i;
 }
+
+// rdar://6093986
+int test2(void) {
+  float x[2];
+  return x;
+}
+
-- 
2.40.0