derek.holloway
7502bf64a4
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59 lines
1.6 KiB
LLVM
59 lines
1.6 KiB
LLVM
; RUN: opt < %s -passes=globalopt -S | FileCheck %s
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; RUN: opt -emulated-tls < %s -passes=globalopt -S | FileCheck %s
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declare void @wait()
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declare void @signal()
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declare void @start_thread(ptr)
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@x = internal thread_local global [100 x i32] zeroinitializer, align 16
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@ip = internal global ptr null, align 8
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; PR14309: GlobalOpt would think that the value of @ip is always the address of
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; x[1]. However, that address is different for different threads so @ip cannot
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; be replaced with a constant.
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define i32 @f() {
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entry:
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; Set @ip to point to x[1] for thread 1.
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%p = call ptr @llvm.threadlocal.address(ptr @x)
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%addr = getelementptr inbounds [100 x i32], ptr %p, i64 0, i64 1
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store ptr %addr, ptr @ip, align 8
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; Run g on a new thread.
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tail call void @start_thread(ptr @g) nounwind
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tail call void @wait() nounwind
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; Reset x[1] for thread 1.
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store i32 0, ptr %addr, align 4
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; Read the value of @ip, which now points at x[1] for thread 2.
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%0 = load ptr, ptr @ip, align 8
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%1 = load i32, ptr %0, align 4
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ret i32 %1
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; CHECK-LABEL: @f(
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; Make sure that the load from @ip hasn't been removed.
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; CHECK: load ptr, ptr @ip
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; CHECK: ret
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}
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define internal void @g() nounwind uwtable {
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entry:
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; Set @ip to point to x[1] for thread 2.
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%p = call ptr @llvm.threadlocal.address(ptr @x)
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%addr = getelementptr inbounds [100 x i32], ptr %p, i64 0, i64 1
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store ptr %addr, ptr @ip, align 8
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; Store 50 in x[1] for thread 2.
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store i32 50, ptr %addr, align 4
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tail call void @signal() nounwind
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ret void
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; CHECK-LABEL: @g(
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; Make sure that the store to @ip hasn't been removed.
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; CHECK: store {{.*}} @ip
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; CHECK: ret
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}
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