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Re: PR middle-end/52141: ICE due to asm statement


On Tue, Feb 14, 2012 at 6:47 PM, Richard Henderson <rth@redhat.com> wrote:
> On 02/14/2012 08:46 AM, Aldy Hernandez wrote:
>> The call to ipa_tm_diagnose_tm_safe() does nothing because there are no longer any calls in the function, since the function call has been inlined:
>>
>> f ()
>> {
>> <bb 2>:
>> ? __asm__ __volatile__("");
>> ? return;
>>
>> }
>>
>> Perhaps we could issue the error when we notice the GIMPLE_ASM while scanning for irrevocable blocks earlier. ?The attached patch does so, and fixes the PR.
>>
>> What am I missing, cause I *know* there's a rat's nest somewhere.
>
> Ug.
>
> Which means that the error message is all too likely simply be confusing
> rather than anything else, since the asm isn't lexically present in the
> transaction.
>
> I wonder, not for the first time, if we shouldn't simply turn off early
> inlining with TM, or at least of and into tm-related functions, such as
> this. ?I assume that the IPA inlining pass would take up the slack...

Hmm.  I think you rather want to teach local_pure_const about TM
properties you want to know and have them propagated properly
(of course unless pure/const which is about optimization and has an
easy fallback default yours wouldn't have that - you'd have to assume
the callee contains an invalid asm ...)

Richard.

>
> r~


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