1; RUN: opt < %s -globalopt -S | FileCheck %s 2; RUN: opt -emulated-tls < %s -globalopt -S | FileCheck %s 3 4declare void @wait() 5declare void @signal() 6declare void @start_thread(void ()*) 7 8@x = internal thread_local global [100 x i32] zeroinitializer, align 16 9@ip = internal global i32* null, align 8 10 11; PR14309: GlobalOpt would think that the value of @ip is always the address of 12; x[1]. However, that address is different for different threads so @ip cannot 13; be replaced with a constant. 14 15define i32 @f() { 16entry: 17 ; Set @ip to point to x[1] for thread 1. 18 store i32* getelementptr inbounds ([100 x i32], [100 x i32]* @x, i64 0, i64 1), i32** @ip, align 8 19 20 ; Run g on a new thread. 21 tail call void @start_thread(void ()* @g) nounwind 22 tail call void @wait() nounwind 23 24 ; Reset x[1] for thread 1. 25 store i32 0, i32* getelementptr inbounds ([100 x i32], [100 x i32]* @x, i64 0, i64 1), align 4 26 27 ; Read the value of @ip, which now points at x[1] for thread 2. 28 %0 = load i32*, i32** @ip, align 8 29 30 %1 = load i32, i32* %0, align 4 31 ret i32 %1 32 33; CHECK-LABEL: @f( 34; Make sure that the load from @ip hasn't been removed. 35; CHECK: load i32*, i32** @ip 36; CHECK: ret 37} 38 39define internal void @g() nounwind uwtable { 40entry: 41 ; Set @ip to point to x[1] for thread 2. 42 store i32* getelementptr inbounds ([100 x i32], [100 x i32]* @x, i64 0, i64 1), i32** @ip, align 8 43 44 ; Store 50 in x[1] for thread 2. 45 store i32 50, i32* getelementptr inbounds ([100 x i32], [100 x i32]* @x, i64 0, i64 1), align 4 46 47 tail call void @signal() nounwind 48 ret void 49 50; CHECK-LABEL: @g( 51; Make sure that the store to @ip hasn't been removed. 52; CHECK: store {{.*}} @ip 53; CHECK: ret 54} 55