https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
user202729 changed:
What|Removed |Added
CC||user202729 at protonmail dot
com
---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #16 from rguenther at suse dot de ---
On Tue, 6 Jun 2023, amonakov at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
>
> --- Comment #15 from Alexander Monakov ---
> malloc and friends modify 'errno'
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #15 from Alexander Monakov ---
malloc and friends modify 'errno' on failure, so in they would have to be
special-cased for alias analysis.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
Richard Biener changed:
What|Removed |Added
CC||aagarwa at gcc dot gnu.org,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #13 from rguenther at suse dot de ---
On Tue, 6 Jun 2023, ptk.prasertsuk at gmail dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
>
> --- Comment #11 from Pontakorn Prasertsuk
> ---
> (In reply to
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #12 from Pontakorn Prasertsuk ---
I notice that GCC also does not optimize this case:
https://godbolt.org/z/7oGqjqqz4
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #11 from Pontakorn Prasertsuk ---
(In reply to rguent...@suse.de from comment #10)
> On Mon, 5 Jun 2023, ptk.prasertsuk at gmail dot com wrote:
>
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
> >
> > --- Comment #9 from
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #10 from rguenther at suse dot de ---
On Mon, 5 Jun 2023, ptk.prasertsuk at gmail dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
>
> --- Comment #9 from Pontakorn Prasertsuk ---
> (In reply to Richard Biener
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #9 from Pontakorn Prasertsuk ---
(In reply to Richard Biener from comment #8)
> (In reply to Pontakorn Prasertsuk from comment #7)
> > For the LLVM IR code of the snippet I provided, Clang's alias analysis can
> > prove that `new`
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #8 from Richard Biener ---
(In reply to Pontakorn Prasertsuk from comment #7)
> For the LLVM IR code of the snippet I provided, Clang's alias analysis can
> prove that `new` call has no side effect to other memory location. This is
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #7 from Pontakorn Prasertsuk ---
For the LLVM IR code of the snippet I provided, Clang's alias analysis can
prove that `new` call has no side effect to other memory location. This is
indicated by `noalias` keyword at the return
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #6 from rguenther at suse dot de ---
On Tue, 30 May 2023, pinskia at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
>
> Andrew Pinski changed:
>
>What|Removed
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #5 from Pontakorn Prasertsuk ---
(In reply to Andrew Pinski from comment #3)
> We don't even optimize:
> ```
> struct MyClass
> {
> unsigned long long arr[128];
> };
>
> [[gnu::noipa]]
> void sink(void *m);
> void gg(MyClass ,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #4 from Pontakorn Prasertsuk ---
(In reply to Richard Biener from comment #1)
> Ick - convoluted C++. We end up with
>
> void ff (struct MyClass & obj)
> {
> vector(2) long unsigned int vect_SR.16;
> vector(2) long unsigned
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #3 from Andrew Pinski ---
We don't even optimize:
```
struct MyClass
{
unsigned long long arr[128];
};
[[gnu::noipa]]
void sink(void *m);
void gg(MyClass , MyClass *b)
{
MyClass c = a;
*b = c;
sink(b);
}
```
As I
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
Andrew Pinski changed:
What|Removed |Added
Keywords||missed-optimization
Ever
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110035
--- Comment #1 from Richard Biener ---
Ick - convoluted C++. We end up with
void ff (struct MyClass & obj)
{
vector(2) long unsigned int vect_SR.16;
vector(2) long unsigned int vect_SR.15;
vector(2) long unsigned int vect_SR.14;
void
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