https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71488
Bug ID: 71488
Summary: Wrong code on GCC trunk with ivybridge and westmere
targets
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 38673
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38673&action=edit
Reproducer
It looks like the result on -O3 is incorrect
Reproduce:
> g++ -std=c++11 -static-libgcc -static-libstdc++ -O0 -march=westmere -o out
> crash.cpp
Output: -5386832788153059297
> g++ -std=c++11 -static-libgcc -static-libstdc++ -O3 -march=westmere -o out
> crash.cpp
Output: -5386832788153059298
> g++ -std=c++11 -static-libgcc -static-libstdc++ -O0 -march=ivybridge -o out
> crash.cpp
Output: -5386832788153059297
> g++ -std=c++11 -static-libgcc -static-libstdc++ -O3 -march=ivybridge -o out
> crash.cpp
Output: -5386832788153059298
> 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=237240/svn-rev:237241/
--prefix=/export/users/gnutester/stability/work/trunk/64/install
--enable-languages=c,c++,fortran,java,lto
Thread model: posix
gcc version 7.0.0 20160608 (experimental) (Revision=237240/svn-rev:237241/)
