https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88011
--- Comment #3 from boger at gcc dot gnu.org --- Created attachment 45003 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45003&action=edit Reproducer testcase for gccgo testresults failures in GCD You should be able to build this using gccgo: gccgo -o gcdbug gcdbug.go Here is the link to the Go documentation for GCD: https://golang.org/pkg/math/big/#Int.GCD So far it looks like many of the testcase failures call GCD at some point.