[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665 --- Comment #9 from Jonathan Wakely --- Correction, on both x86_64 and ppc64le it requires all of: -fstrict-aliasing -ftree-loop-vectorize -ftree-sra -ftree-ch -ftree-forwprop -ftree-copy-prop

[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665 Ville Voutilainen changed: What|Removed |Added CC||ville.voutilainen at gmail dot com

[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665 --- Comment #7 from Jonathan Wakely --- On x86_64 it fails with -O1 -fstrict-aliasing -ftree-loop-vectorize It still fails if every -fno-xxx option for -O1 is added except -fno-tree-copy-prop so it seems to require: -fstrict-aliasing

[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665 --- Comment #6 from Jonathan Wakely --- Since r254694 only changed all -std modes to match -std=c++17 I bisected again using -std=c++17 to find the change that really caused it, and it was indeed r246301 which first removed that null check.

[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665 --- Comment #5 from Jonathan Wakely --- Confirmed that -fcheck-null fixes the miscompilation.

[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665 Jonathan Wakely changed: What|Removed |Added CC||ville at gcc dot gnu.org Target

[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665 Richard Biener changed: What|Removed |Added Target Milestone|--- |8.3

[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665 --- Comment #3 from Jan Christoph Uhde --- » g++-head -v Using built-in specs. COLLECT_GCC=g++-head COLLECT_LTO_WRAPPER=/bal/gcc_trunk_install/bin/../libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with:

[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665 --- Comment #2 from Jonathan Wakely --- (In reply to Jonathan Wakely from comment #1) > The behaviour changed with r255268 Which doesn't make sense as the bug seems to be target-independent.

[Bug c++/87665] [8/9 Regression] gcc HEAD (svn: 265340) breaks elements on resize

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87665 Jonathan Wakely changed: What|Removed |Added Status|UNCONFIRMED |NEW Known to work|