forked from OSchip/llvm-project
55 lines
1.6 KiB
LLVM
55 lines
1.6 KiB
LLVM
|
; RUN: opt < %s -globalopt -S | FileCheck %s
|
||
|
|
; RUN: opt -emulated-tls < %s -globalopt -S | FileCheck %s
|
||
|
|
|
||
|
|
declare void @wait()
|
||
|
|
declare void @signal()
|
||
|
|
declare void @start_thread(void ()*)
|
||
|
|
|
||
|
|
@x = internal thread_local global [100 x i32] zeroinitializer, align 16
|
||
|
|
@ip = internal global i32* null, align 8
|
||
|
|
|
||
|
|
; PR14309: GlobalOpt would think that the value of @ip is always the address of
|
||
|
|
; x[1]. However, that address is different for different threads so @ip cannot
|
||
|
|
; be replaced with a constant.
|
||
|
|
|
||
|
|
define i32 @f() {
|
||
|
|
entry:
|
||
|
|
; Set @ip to point to x[1] for thread 1.
|
||
|
|
store i32* getelementptr inbounds ([100 x i32], [100 x i32]* @x, i64 0, i64 1), i32** @ip, align 8
|
||
|
|
|
||
|
|
; Run g on a new thread.
|
||
|
|
tail call void @start_thread(void ()* @g) nounwind
|
||
|
|
tail call void @wait() nounwind
|
||
|
|
|
||
|
|
; Reset x[1] for thread 1.
|
||
|
|
store i32 0, i32* getelementptr inbounds ([100 x i32], [100 x i32]* @x, i64 0, i64 1), align 4
|
||
|
|
|
||
|
|
; Read the value of @ip, which now points at x[1] for thread 2.
|
||
|
|
%0 = load i32*, i32** @ip, align 8
|
||
|
|
|
||
|
|
%1 = load i32, i32* %0, align 4
|
||
|
|
ret i32 %1
|
||
|
|
|
||
|
|
; CHECK-LABEL: @f(
|
||
|
|
; Make sure that the load from @ip hasn't been removed.
|
||
|
|
; CHECK: load i32*, i32** @ip
|
||
|
|
; CHECK: ret
|
||
|
|
}
|
||
|
|
|
||
|
|
define internal void @g() nounwind uwtable {
|
||
|
|
entry:
|
||
|
|
; Set @ip to point to x[1] for thread 2.
|
||
|
|
store i32* getelementptr inbounds ([100 x i32], [100 x i32]* @x, i64 0, i64 1), i32** @ip, align 8
|
||
|
|
|
||
|
|
; Store 50 in x[1] for thread 2.
|
||
|
|
store i32 50, i32* getelementptr inbounds ([100 x i32], [100 x i32]* @x, i64 0, i64 1), align 4
|
||
|
|
|
||
|
|
tail call void @signal() nounwind
|
||
|
|
ret void
|
||
|
|
|
||
|
|
; CHECK-LABEL: @g(
|
||
|
|
; Make sure that the store to @ip hasn't been removed.
|
||
|
|
; CHECK: store {{.*}} @ip
|
||
|
|
; CHECK: ret
|
||
|
|
}
|