Comment 6 for bug 554983

I have the following pattern.

-O0, -O3: no failing assert
-O1, -O2: failing assert

But no apparent reason since -O3 is a superset of -O2

gcc -c -Q -O3 --help=optimizers > /tmp/O3-opts
gcc -c -Q -O2 --help=optimizers > /tmp/O2-opts
diff /tmp/O2-opts /tmp/O3-opts | grep enabled

> -fgcse-after-reload [enabled]
> -finline-functions [enabled]
> -fipa-cp-clone [enabled]
> -fpredictive-commoning [enabled]
> -ftree-vectorize [enabled]
> -funswitch-loops [enabled]