DSE and maskstore trouble

[Andrew Stubbs]

On 03/07/18 12:30, Richard Biener wrote:
>> Hmm, so they're safe, but may prevent the optimization of nearby variables?
> 
> Yes, they prevent earlier stores into lanes that are "really" written
> to to be DSEd.

Right, but I have unrelated variables allocated to the stack within the 
"shadow" of the masked vector. I didn't ask it to do that, it just does, 
so I presume this is an expect feature of masked vectors with a known mask.

Surely this prevents valid optimizations on those variables?

Andrew