https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116912
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Just looked at `-O2` and `-O2 -fno-strict-aliasing` code generation and yes I
100% can confirm this is an aliasing issue.
With -fno-strict-aliasing we get:
```
bl printf //
mov x1, x20 //, pmcr_n
add x0, sp, 112 //,,
bl set_pmcr_n //
mov x3, x20 //, pmcr_n
ldr x2, [sp, 112] // pmcr.22_1, pmcr
add x0, x22, :lo12:.LC37 //, tmp177,
mov x1, x21 //, _58
str x2, [sp, 104] // pmcr.22_1, %sfp
bl printf //
```
Which is what you wanted.
