https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92379
--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> --- commit r10-7169-g50c96067c8ed60f4b3fcbee89fe31c905241b356 Author: Aaron Sawdey <acsaw...@linux.ibm.com> Date: Fri Mar 13 18:14:22 2020 -0500 Fix UBSAN error, shifting 64 bit value by 64. 2020-03-13 Aaron Sawdey <acsaw...@linux.ibm.com> PR target/92379 * config/rs6000/rs6000.c (num_insns_constant_multi) Don't shift a 64-bit value by 64 bits (UB).