-fprofile-update=atomic vs. 32-bit architectures

[Sebastian Huber]

On 08.11.22 11:25, Richard Biener wrote:
>> How do I get ((unsigned int *) &val) + 1 from tree addr?
>>
>> It would be great to have a code example for the construction of the "if
>> (f()) f();".
> I think for the function above we need to emit __atomic_fetch_add_8,
> not the emulated form because we cannot insert the required control
> flow (if (f()) f()) on an edge.  The __atomic_fetch_add_8 should then be
> lowered after the instrumentation took place.

Ok, I am not a compiler expert, so I have just a vague feeling how this 
works. I am not sure which piece is responsible for the "lowering" of 
this particular __atomic_fetch_add_8. I guess we don't want to split all 
__atomic_fetch_add_8 into this if (f()) f(); form?

> 
> There's currently no helper to create a diamond so the canonical
> way is to create a GIMPLE_COND, split the block after this stmt,
> split the outgoing edge and then redirect edges to form a half-diamond.
> move_sese_in_condition has most of that CFG manipulation (but
> it performs sth different)

Thanks, I will probably able to do this with a bit trial and error.

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