From eca55afea3018f4f322a4b9bf0a3a45ba6014962 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Fri, 16 Jul 2010 00:55:21 +0000
Subject: Fix for PR3800: make sure not to evaluate the expression for a
 read-write asm operand twice.

llvm-svn: 108489
---
 clang/test/CodeGen/asm-inout.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 clang/test/CodeGen/asm-inout.c

(limited to 'clang/test/CodeGen/asm-inout.c')

diff --git a/clang/test/CodeGen/asm-inout.c b/clang/test/CodeGen/asm-inout.c
new file mode 100644
index 00000000000..f04276693e2
--- /dev/null
+++ b/clang/test/CodeGen/asm-inout.c
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm %s -o - | FileCheck %s
+// PR3800
+int *foo(void);
+
+// CHECK: @test1
+void test1() {
+  // CHECK: [[REGCALLRESULT:%[a-zA-Z0-9\.]+]] = call i32* @foo()
+  // CHECK: call void asm "foobar", "=*m,*m,~{dirflag},~{fpsr},~{flags}"(i32* [[REGCALLRESULT]], i32* [[REGCALLRESULT]])
+  asm ("foobar" : "+m"(*foo()));
+}
+
+// CHECK: @test2
+void test2() {
+  // CHECK: [[REGCALLRESULT:%[a-zA-Z0-9\.]+]] = call i32* @foo()
+  // CHECK: load i32* [[REGCALLRESULT]]
+  // CHECK: call i32 asm
+  // CHECK: store i32 {{%[a-zA-Z0-9\.]+}}, i32* [[REGCALLRESULT]]
+  asm ("foobar" : "+r"(*foo()));
+}
-- 
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