llvm dev - Jul 2007 - [LLVMdev] thread_local

Hi,

This weekend, I've noticed that GlobalVariable's could be declared as  
thread-local in LLVM 2.0. However, when using it on a small example  
(OSX), I got the following error:

========
Cannot yet select: 0x56059f0: i32 = GlobalTLSAddress <i32* @a> 0
Abort trap

========
This is the example code:

========
; ModuleID = 'test.o'
target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32- 
i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0
:64"
target triple = "powerpc-apple-darwin8.9.0"
@a = thread_local global i32 666                ; <i32*> [#uses=2]

define i32 @main() {
entry:
         %retval = alloca i32, align 4           ; <i32*> [#uses=1]
         "alloca point" = bitcast i32 0 to i32           ; <i32>
[#uses=0]
         %tmp = load i32* @a             ; <i32> [#uses=1]
         %tmp1 = add i32 %tmp, 1         ; <i32> [#uses=1]
         store i32 %tmp1, i32* @a
         br label %return

return:         ; preds = %entry
         %retval2 = load i32* %retval            ; <i32> [#uses=1]
         ret i32 %retval2
}

========
Is this a bug or an as yet unimplemented feature (on OSX)?

Kind regards,

Bram Adams
GH-SEL, INTEC, Ghent University (Belgium)

Hi,
> Cannot yet select: 0x56059f0: i32 = GlobalTLSAddress <i32* @a> 0
I'm pretty sure that this simply means that TLS is not implemented
on that target yet.  The message could be more helpful, that's for
sure!

Ciao,

D.

On Wed, 11 Jul 2007, Bram Adams wrote:
> This weekend, I've noticed that GlobalVariable's could be declared
as
> thread-local in LLVM 2.0. However, when using it on a small example 
> (OSX), I got the following error: Is this a bug or an as yet 
> unimplemented feature (on OSX)?
Unfortunately, mac os x in general doesn't support TLS yet.  LLVM can't 
support it there until the kernel and dynamic linker support it.

-Chris

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