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1839858983
For global variables that get the same value stored into them everywhere, GlobalOpt will replace them with a constant. The problem is that a thread-local GlobalVariable looks like one value (the address of the TLS var), but is different between threads. This patch introduces Constant::isThreadDependent() which returns true for thread-local variables and constants which depend on them (e.g. a GEP into a thread-local array), and teaches GlobalOpt not to track such values. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168037 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.5 KiB
LLVM
54 lines
1.5 KiB
LLVM
; RUN: opt < %s -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(void ()*)
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@x = internal thread_local global [100 x i32] zeroinitializer, align 16
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@ip = internal global i32* 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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store i32* getelementptr inbounds ([100 x i32]* @x, i64 0, i64 1), i32** @ip, align 8
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; Run g on a new thread.
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tail call void @start_thread(void ()* @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, i32* getelementptr inbounds ([100 x i32]* @x, i64 0, i64 1), 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 i32** @ip, align 8
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%1 = load i32* %0, align 4
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ret i32 %1
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; CHECK: @f
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; Make sure that the load from @ip hasn't been removed.
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; CHECK: load i32** @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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store i32* getelementptr inbounds ([100 x i32]* @x, i64 0, i64 1), i32** @ip, align 8
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; Store 50 in x[1] for thread 2.
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store i32 50, i32* getelementptr inbounds ([100 x i32]* @x, i64 0, i64 1), align 4
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tail call void @signal() nounwind
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ret void
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; CHECK: @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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