https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71657
Bug ID: 71657
Summary: Wrong code on trunk gcc (std::out_of_range), westmere
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: anton.mitrokhin at phystech dot edu
Target Milestone: ---
Created attachment 38767
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38767&action=edit
Reproducer
It looks like there is some king of overflow while computing array index (which
is actually should be correct)
This happens only on westmere, O3/Ofast
Compile:
> g++ -std=c++11 -static-libgcc -static-libstdc++ -O3 -march=westmere -o out
> crash_init.cpp crash_main.cpp
Run:
> ./out
Output:
terminate called after throwing an instance of 'std::out_of_range'
what(): vector::_M_range_check: __n (which is 20751846) >= this->size()
(which is 38)
Aborted (core dumped)
> gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/export/users/amitrokh/gcc_trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /export/users/gnutester/stability/svn/trunk/configure
--with-arch=corei7 --with-cpu=corei7 --enable-clocale=gnu --with-system-zlib
--enable-shared --with-demangler-in-ld --enable-cloog-backend=isl
--with-fpmath=sse --with-pkgversion=Revision=237716/svn-rev:237719/
--prefix=/export/users/gnutester/stability/work/trunk/64/install
--enable-languages=c,c++,fortran,java,lto
Thread model: posix
gcc version 7.0.0 20160622 (experimental) (Revision=237716/svn-rev:237719/)
