https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #18 from Alexander Cherepanov ---
Adding a `memset` makes trunk fail too:
--
#include
#include
struct s {
char c;
int i;
};
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #17 from Martin Jambor ---
If we really decide to fix this in SRA, i can be done (after the previous
patches in the series are in) with something like
https://gcc.gnu.org/ml/gcc-patches/2019-12/msg01185.html
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #16 from Alexander Cherepanov ---
BTW this bug combines nicely with pr71460. Possible effects:
- padding in a long double inside a struct is lost on x86-64;
- sNaN is converted to qNaN in a double inside a struct on x86-32.
Both are
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #15 from Martin Jambor ---
(In reply to rguent...@suse.de from comment #14)
> On Fri, 15 Nov 2019, jamborm at gcc dot gnu.org wrote:
>
> [...] But yes, for your example we'd copy-prop out c and b which
> might then have created
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #14 from rguenther at suse dot de ---
On Fri, 15 Nov 2019, jamborm at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
>
> --- Comment #13 from Martin Jambor ---
> (In reply to rguent...@suse.de from
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #13 from Martin Jambor ---
(In reply to rguent...@suse.de from comment #10)
> [...] But total scalarization works with the premise
> that we don't see any direct accesses to source or destination
That is not true, total
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #12 from rguenther at suse dot de ---
On Thu, 14 Nov 2019, ch3root at openwall dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
>
> --- Comment #9 from Alexander Cherepanov ---
> > Now as an exercise build a
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #11 from rguenther at suse dot de ---
On Thu, 14 Nov 2019, msebor at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
>
> Martin Sebor changed:
>
>What|Removed |Added
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #10 from rguenther at suse dot de ---
On Thu, 14 Nov 2019, pinskia at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
>
> --- Comment #7 from Andrew Pinski ---
> I have another idea, cant we add fake
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #9 from Alexander Cherepanov ---
> Now as an exercise build a complete testcase for the DSE issue above.
Source code:
--
#include
#include
struct s {
char
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
Martin Sebor changed:
What|Removed |Added
CC||msebor at gcc dot gnu.org
--- Comment #8
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #7 from Andrew Pinski ---
I have another idea, cant we add fake field decls while doing structure layout?
Then sra total scalarization will just work. And there is no other magic in the
compiler needed?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #6 from rguenther at suse dot de ---
On November 14, 2019 5:11:55 PM GMT+01:00, "jamborm at gcc dot gnu.org"
wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
>
>--- Comment #5 from Martin Jambor ---
>While I don't share
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #5 from Martin Jambor ---
While I don't share this preference about assignments, SRA only
ignores padding when doing "total scalarization" aka the poor man's
aggregate copy propagation because in that mode it would have to
invent
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
Richard Biener changed:
What|Removed |Added
CC||jamborm at gcc dot gnu.org
--- Comment
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
--- Comment #3 from Richard Biener ---
Note when changing struct s to say
struct s {
char c;
int i __attribute__((aligned(128)));
};
you can (if you disable SRA!) observe that RTL expansion copies padding
for aggregate assignments:
g:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
Richard Biener changed:
What|Removed |Added
Keywords||wrong-code
CC|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92486
Martin Liška changed:
What|Removed |Added
Status|UNCONFIRMED |NEW
Last reconfirmed|
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