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Date: Mon, 28 Apr 2014 20:56:58 -0400
From: Rich Felker <>
Subject: Re: thumb2 support

On Tue, Apr 29, 2014 at 12:52:36AM +0100, Stephen Thomas wrote:
> I remember that the old thumb didn't support the conditional
> instructions and was quite slow. I only care about thumb2 and am
> currently using gcc, so I attach a patch for the thumb that will

The code here is only used on armv6/v7. Do any such chips lack thumb2?
If there's any doubt, we could look at what gcc generates for the
__sync_* builtins in thumb mode.

> only work for gcc .

Why is it only for gcc?

> I think that gcc builds two versions of atomic

What do you mean by this?

> so the ugly #define was needed. I cannot remember what rvct/rvds or
> whatever it is branded as these days uses, but from memory old
> versions didn't support the gnu assebmly syntax.

All asm in musl is gas syntax so this is nothing new.


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