Hi, I would like to ping the following patch: https://gcc.gnu.org/ml/gcc-patches/2016-08/msg01015.html
While implementing divmod transform: https://gcc.gnu.org/ml/gcc-patches/2016-05/msg01757.html I ran into an issue with optab_libfunc(). It appears optab_libfunc (sdivmod_optab, mode) returns bogus libfunc for unsupported modes, for instance on x86_64, optab_libfunc (sdivmod_optab, DImode) returns a libfunc with name "__divmoddi4", even though such a libfunc does not exist in libgcc. This happens because in optabs.def the libfunc entry for sdivmod_optab has gen_int_libfunc, and call to optab_libfunc (sdivmo_optab, DImode) lazily creates a bogus libfunc "__divmoddi4" by calling gen_int_libfunc(). To work around this issue I set libfunc entry for sdivmod_optab to NULL and verified that optab_libfunc (sdivmod_optab, DImode) returns NULL_RTX instead of a bogus libfunc if it's not overriden by the target. Bootstrapped and tested on ppc64le-linux-gnu, x86_64-linux-gnu. Cross tested on arm*-*-*, aarch64*-*-*. OK for trunk ? Thanks, Prathamesh
