Always emit full loads from volatile complex l-values.

Return the result of a complex assignment with the original values,
not by performing a load from the l-value;  this is the correct
semantics in C, although not in C++.

llvm-svn: 119037

1 files changed, 23 insertions, 0 deletions

diff --git a/clang/test/CodeGen/volatile-2.c b/clang/test/CodeGen/volatile-2.c
new file mode 100644
index 00000000000..1ceaf17dfcb
--- /dev/null
+++ b/clang/test/CodeGen/volatile-2.c
@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -o - %s | FileCheck %s
+
+void test0() {
+  // CHECK: define void @test0()
+  // CHECK:      [[F:%.*]] = alloca float
+  // CHECK-NEXT: [[REAL:%.*]] = volatile load float* getelementptr inbounds ({{%.*}} @test0_v, i32 0, i32 0)
+  // CHECK-NEXT: volatile load float* getelementptr inbounds ({{%.*}} @test0_v, i32 0, i32 1)
+  // CHECK-NEXT: store float [[REAL]], float* [[F]], align 4
+  // CHECK-NEXT: ret void
+  extern volatile _Complex float test0_v;
+  float f = (float) test0_v;
+}
+
+void test1() {
+  // CHECK: define void @test1()
+  // CHECK:      [[REAL:%.*]] = volatile load float* getelementptr inbounds ({{%.*}} @test1_v, i32 0, i32 0)
+  // CHECK-NEXT: [[IMAG:%.*]] = volatile load float* getelementptr inbounds ({{%.*}} @test1_v, i32 0, i32 1)
+  // CHECK-NEXT: volatile store float [[REAL]], float* getelementptr inbounds ({{%.*}} @test1_v, i32 0, i32 0)
+  // CHECK-NEXT: volatile store float [[IMAG]], float* getelementptr inbounds ({{%.*}} @test1_v, i32 0, i32 1)
+  // CHECK-NEXT: ret void
+  extern volatile _Complex float test1_v;
+  test1_v = test1_v;
+}