https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90106
--- Comment #15 from JunMa <JunMa at linux dot alibaba.com> ---
(In reply to Christophe Lyon from comment #14)
> Sure, here is the contents of cdce3.c.105t.cdce:
>
> ;; Function foo (foo, funcdef_no=0, decl_uid=4197, cgraph_uid=1,
> symbol_order=0)
>
> foo (float x)
> {
> float _4;
>
> <bb 2> [local count: 1073741824]:
> _4 = sqrtf (x_2(D));
> return _4;
>
> }
The contents are as same as cdce3.c.104t.stdarg. Would you please dump it whit
-fdump-tree-cdce-details?
Then we can see(in x86_64)
Found conditional dead call: _4 = sqrtf (x_2(D));
cdce3.c:9: note: function call is shrink-wrapped into error conditions.
It seems that gcc thinks arm doesn't support direct internal function (maybe
vsqrt instruction ?) of sqrtf .
