[llvm-commits] [PATCH] improve ARM halt encoding

[Jim Grosbach]

On Jan 16, 2013, at 3:45 PM, Renato Golin Linaro <renato.golin at linaro.org> wrote:

> On 16 January 2013 22:39, Jim Grosbach <grosbach at apple.com> wrote:
> The entire encoding is semantically significant on Darwin. I suspect that's true on other platforms, too, but I don't know for sure.
> 
> I'm not sure either. I agree with Bastien that it *should* trap on both ARM and Thumb, but it also depends on what catch routine is installed and other hard-to-know problems.
> 

Both instructions will trap; however, how they trap is also important. In this case, it's the difference between the user program terminating with SIGILL vs. SIGTRAP.

-Jim


> Bastien, Have you tested in which platforms?
> 
> cheers,
> --renato
> 
> 

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