https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61493
Bug ID: 61493
Summary: Bug exposed by speculative devirtualizing
Product: gcc
Version: 4.10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: wmi at google dot com
1.cxx is attached.
$~/workarea/gcc-r211604/build/install/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/usr/local/google/home/wmi/workarea/gcc-r211604/build/install/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/google/home/wmi/workarea/gcc-r211604/build/install/libexec/gcc/x86_64-unknown-linux-gnu/4.10.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../src/configure --enable-languages=c,c++ --disable-bootstrap
--prefix=/usr/local/google/home/wmi/workarea/gcc-r211604/build/install
Thread model: posix
gcc version 4.10.0 20140613 (experimental) (GCC)
$~/workarea/gcc-r211604/build/install/bin/g++ -O2 1.cxx
$./a.out
not equal
$~/workarea/gcc-r211604/build/install/bin/g++ -O2 1.cxx
$./a.out
equal
$~/workarea/gcc-r211604/build/install/bin/g++ -O2
-fno-devirtualize-speculatively 1.cxx
$./a.out
equal
Google ref b/15521306
