From c9875bfa6ffecc8d8316820e2970cf7354f610d2 Mon Sep 17 00:00:00 2001
From: Mike Stump <mrs@apple.com>
Date: Thu, 10 Dec 2009 22:57:48 +0000
Subject: [PATCH] Don't complain about falling off the end of a function with
 an asm block, if the function is supposed to return a value as we don't know
 exactly what the asm code does.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91073 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Sema/SemaDecl.cpp | 5 +++++
 test/Sema/return.c    | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index c7a47c98c9..fa0d3cef65 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -1253,6 +1253,11 @@ Sema::ControlFlowKind Sema::CheckFallThrough(Stmt *Root) {
       HasFakeEdge = true;
       continue;
     }
+    if (isa<AsmStmt>(S)) {
+      HasFakeEdge = true;
+      HasLiveReturn = true;
+      continue;
+    }
     bool NoReturnEdge = false;
     if (CallExpr *C = dyn_cast<CallExpr>(S)) {
       Expr *CEE = C->getCallee()->IgnoreParenCasts();
diff --git a/test/Sema/return.c b/test/Sema/return.c
index ad75cf1a0b..2e8120a754 100644
--- a/test/Sema/return.c
+++ b/test/Sema/return.c
@@ -222,3 +222,7 @@ void test32() {
 void test33() {
   if (j) while (1) { }
 }
+
+int test34() {
+  asm("nop");
+}