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* [Bug c++/109421] New: Compilation takes a long time for struct that contains a large default-initialized array
@ 2023-04-05 17:20 ejakobs at boerboeltrading dot com
2023-04-05 17:24 ` [Bug c++/109421] " pinskia at gcc dot gnu.org
2023-04-05 17:25 ` pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: ejakobs at boerboeltrading dot com @ 2023-04-05 17:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109421
Bug ID: 109421
Summary: Compilation takes a long time for struct that contains
a large default-initialized array
Product: gcc
Version: 11.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ejakobs at boerboeltrading dot com
Target Milestone: ---
This is similar to #59659, but is still a problem in GCC 11.2.1 and GCC 10.2.1.
The following code takes a very long time to compile with -O3 enabled:
#include <vector>
#ifndef SIZE
#define SIZE 100000
#endif
struct S
{
int a;
};
struct T
{
std::vector<S> arr[SIZE]{}; // remove the default-initializer {} to compile
fast
};
int main(int argc, char** argv)
{
T t;
for (int i=0; i<SIZE; ++i) {
t.arr[i].push_back(S{argc * i}); // use argc so that gcc doesn't optimize
everything out
}
return t.arr[SIZE-1][0].a;
}
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/109421] Compilation takes a long time for struct that contains a large default-initialized array
2023-04-05 17:20 [Bug c++/109421] New: Compilation takes a long time for struct that contains a large default-initialized array ejakobs at boerboeltrading dot com
@ 2023-04-05 17:24 ` pinskia at gcc dot gnu.org
2023-04-05 17:25 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-04-05 17:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109421
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks to be fixed with GCC 12.1.0 .
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug c++/109421] Compilation takes a long time for struct that contains a large default-initialized array
2023-04-05 17:20 [Bug c++/109421] New: Compilation takes a long time for struct that contains a large default-initialized array ejakobs at boerboeltrading dot com
2023-04-05 17:24 ` [Bug c++/109421] " pinskia at gcc dot gnu.org
@ 2023-04-05 17:25 ` pinskia at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-04-05 17:25 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109421
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 92385.
*** This bug has been marked as a duplicate of bug 92385 ***
^ permalink raw reply [flat|nested] 3+ messages in thread
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2023-04-05 17:20 [Bug c++/109421] New: Compilation takes a long time for struct that contains a large default-initialized array ejakobs at boerboeltrading dot com
2023-04-05 17:24 ` [Bug c++/109421] " pinskia at gcc dot gnu.org
2023-04-05 17:25 ` pinskia at gcc dot gnu.org
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