With the patch from http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49452
the regstate information is resetted at the unspec_volatile instead of
invalidated!
You're right. This wouldn't have happened if the code had been properly
commented.
2011-11-14 Andreas Krebbel
Hi,
a problem in postreload causes a miscompilation of libgomp on s390x.
insn 1: r1 = r1 + r2
insn 2: r3 = r1
insn 3: unspec_volatile
insn 4: use r1
With the patch from http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49452
the regstate information is resetted at the unspec_volatile instead of
