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17e97fbf13
The 'common' section TLS is not implemented. Current C/C++ TLS variables are not placed in common section. DWARF debug info to get the address of TLS variables is not generated yet. clang and driver changes in http://reviews.llvm.org/D10524 Added -femulated-tls flag to select the emulated TLS model, which will be used for old targets like Android that do not support ELF TLS models. Added TargetLowering::LowerToTLSEmulatedModel as a target-independent function to convert a SDNode of TLS variable address to a function call to __emutls_get_address. Added into lib/Target/*/*ISelLowering.cpp to call LowerToTLSEmulatedModel for TLSModel::Emulated. Although all targets supporting ELF TLS models are enhanced, emulated TLS model has been tested only for Android ELF targets. Modified AsmPrinter.cpp to print the emutls_v.* and emutls_t.* variables for emulated TLS variables. Modified DwarfCompileUnit.cpp to skip some DIE for emulated TLS variabls. TODO: Add proper DIE for emulated TLS variables. Added new unit tests with emulated TLS. Differential Revision: http://reviews.llvm.org/D10522 llvm-svn: 243438
55 lines
1.6 KiB
LLVM
55 lines
1.6 KiB
LLVM
; RUN: opt < %s -globalopt -S | FileCheck %s
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; RUN: opt -emulated-tls < %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], [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], [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*, i32** @ip, align 8
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%1 = load i32, i32* %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 i32*, 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], [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], [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-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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