https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105769
Bug ID: 105769
Summary: program segmentation fault with -ftree-vectorize and
nested lambdas
Product: gcc
Version: 11.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sliwa at ifpan dot edu.pl
Target Milestone: ---
Created attachment 53050
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53050&action=edit
sample program demonstrating undefined behavior
The attached program triggers undefined behavior with g++ (the resulting binary
segfaults in the manager code of a functor wrapper) when compiled as follows
(minimal flags to trigger):
g++ -flto -O1 -ftree-vectorize tst.cc
This may be related to memory alignment of data (I see a crash with long
double, but not with double). Other things to check is the capture of functor
est in program line 57 (adding an ampersand eliminates the issue). Even
changing the data in lines 81-82 (for example to 0) affects the outcome.
Platform: amd64, RHEL or Gentoo Linux.
