https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80902
Bug ID: 80902
Summary: A problem in expand_builtin_atomic_fetch_op
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: segher at gcc dot gnu.org
Target Milestone: ---
Since r247848 there are 633 FAILs in go and 131 FAILs in libgo, on
powerpc-linux. What happens is the test for atomic.Xadd64 fails, in
runtime1.go, and then it throws an error but that itself crashes because
getg() returns 0, it hasn't been initialised yet.
The Xadd64 test fails because Xadd64 returns the original value, not the
modified value. This is a problem in builtins.c; I have a patch.
