Re: [RFC] expr: don't clear SUBREG_PROMOTED_VAR_P flag for a promoted subreg [target/111466]

[Jeff Law]

On 9/29/23 04:40, Roger Sayle wrote:

I agree that this looks dubious.  Normally, if the middle-end/optimizers
wish to reuse a SUBREG in a context where the flags are not valid, it
should create a new one with the desired flags, rather than "mutate"
an existing (and possibly shared) RTX.
SUBREGs aren't shared, though I don't think that changes any of your 
conclusions.


jeff