[LLVMdev] Inline asm bug?
kparzysz at codeaurora.org
Tue Jan 8 14:28:08 PST 2013
On 1/8/2013 4:24 PM, Eli Friedman wrote:
> It's kind of weird... inline asm hooks into the compiler at a low
> level, so think of it this way: alias analysis queries the "memory"
> clobber, but dead code elimination ignores the clobber list. You're
> right, this makes absolutely no sense from the user's perspective.
Ok, this sheds some light on it.
Given that the "memory" clobber in the original example had no effect, I
am assuming that this is indeed a bug. Am I correct? The problem there
is that the load from G has been lost during translation to MI, so I'm
assuming that this is something that the clobber should have prevented.
I have a local patch for it that I can submit here for review.
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