1 files changed, 49 insertions, 0 deletions
diff --git a/llvm/test/Transforms/IPConstantProp/pthreads.ll b/llvm/test/Transforms/IPConstantProp/pthreads.ll
new file mode 100644
index 00000000000..0af2c166a08
--- /dev/null
+++ b/llvm/test/Transforms/IPConstantProp/pthreads.ll
@@ -0,0 +1,49 @@
+; RUN: opt -ipconstprop -S < %s | FileCheck %s
+;
+;    #include <pthread.h>
+;
+;    void *GlobalVPtr;
+;
+;    static void *foo(void *arg) { return arg; }
+;    static void *bar(void *arg) { return arg; }
+;
+;    int main() {
+;      pthread_t thread;
+;      pthread_create(&thread, NULL, foo, NULL);
+;      pthread_create(&thread, NULL, bar, &GlobalVPtr);
+;      return 0;
+;    }
+;
+; Verify the constant values NULL and &GlobalVPtr are propagated into foo and
+; bar, respectively.
+;
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+%union.pthread_attr_t = type { i64, [48 x i8] }
+
+@GlobalVPtr = common dso_local global i8* null, align 8
+
+define dso_local i32 @main() {
+entry:
+  %thread = alloca i64, align 8
+  %call = call i32 @pthread_create(i64* nonnull %thread, %union.pthread_attr_t* null, i8* (i8*)* nonnull @foo, i8* null)
+  %call1 = call i32 @pthread_create(i64* nonnull %thread, %union.pthread_attr_t* null, i8* (i8*)* nonnull @bar, i8* bitcast (i8** @GlobalVPtr to i8*))
+  ret i32 0
+}
+
+declare !callback !0 dso_local i32 @pthread_create(i64*, %union.pthread_attr_t*, i8* (i8*)*, i8*)
+
+define internal i8* @foo(i8* %arg) {
+entry:
+; CHECK: ret i8* null
+  ret i8* %arg
+}
+
+define internal i8* @bar(i8* %arg) {
+entry:
+; CHECK: ret i8* bitcast (i8** @GlobalVPtr to i8*)
+  ret i8* %arg
+}
+
+!1 = !{i64 2, i64 3, i1 false}
+!0 = !{!1}