1 ; RUN: opt < %s -globalopt -S | FileCheck %s 2 ; RUN: opt -emulated-tls < %s -globalopt -S | FileCheck %s 3 4 declare void @wait() 5 declare void @signal() 6 declare 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 15 define i32 @f() { 16 entry: 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 39 define internal void @g() nounwind uwtable { 40 entry: 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
