Yesterday's patch has been approved (decremnt IV support): https://gcc.gnu.org/pipermail/gcc-patches/2023-May/619663.html
However, it creates fails on PowerPC: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109971 I am really sorry for causing inconvinience. I wonder as we disccussed: + /* If we're vectorizing a loop that uses length "controls" and + can iterate more than once, we apply decrementing IV approach + in loop control. */ + if (LOOP_VINFO_CAN_USE_PARTIAL_VECTORS_P (loop_vinfo) + && !LOOP_VINFO_LENS (loop_vinfo).is_empty () + && LOOP_VINFO_PARTIAL_LOAD_STORE_BIAS (loop_vinfo) == 0 + && !(LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo) + && known_le (LOOP_VINFO_INT_NITERS (loop_vinfo), + LOOP_VINFO_VECT_FACTOR (loop_vinfo)))) + LOOP_VINFO_USING_DECREMENTING_IV_P (loop_vinfo) = true; This conditions can not disable decrement IV on PowerPC. Should I add a target hook for it? The patch I can only do bootstrap and regression on X86. I didn't have an environment to test PowerPC. I am really sorry. Thanks. juzhe.zh...@rivai.ai
