https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103126
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>: https://gcc.gnu.org/g:249b4eeef1fe30237acb4d8e1832243b39d61e7e commit r12-5084-g249b4eeef1fe30237acb4d8e1832243b39d61e7e Author: liuhongt <hongtao....@intel.com> Date: Mon Nov 8 15:49:17 2021 +0800 Extend is_cond_scalar_reduction to handle bit_and/bit_xor/bit_ior. This will enable transformation like - # sum1_50 = PHI <prephitmp_64(13), 0(4)> - # sum2_52 = PHI <sum2_21(13), 0(4)> + # sum1_50 = PHI <_87(13), 0(4)> + # sum2_52 = PHI <_89(13), 0(4)> # ivtmp_62 = PHI <ivtmp_61(13), 64(4)> i.2_7 = (long unsigned int) i_49; _8 = i.2_7 * 8; ... vec1_i_38 = vec1_29 >> _10; vec2_i_39 = vec2_31 >> _10; _11 = vec1_i_38 & 1; - _63 = tmp_37 ^ sum1_50; - prephitmp_64 = _11 == 0 ? sum1_50 : _63; + _ifc__86 = _11 != 0 ? tmp_37 : 0; + _87 = sum1_50 ^ _ifc__86; _12 = vec2_i_39 & 1; : so that vectorizer won't failed due to /* If this isn't a nested cycle or if the nested cycle reduction value is used ouside of the inner loop we cannot handle uses of the reduction value. */ if (nlatch_def_loop_uses > 1 || nphi_def_loop_uses > 1) { if (dump_enabled_p ()) dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location, "reduction used in loop.\n"); return NULL; } gcc/ChangeLog: PR tree-optimization/103126 * tree-vect-loop.c (neutral_op_for_reduction): Remove static. * tree-vectorizer.h (neutral_op_for_reduction): Declare. * tree-if-conv.c : Include tree-vectorizer.h. (is_cond_scalar_reduction): Handle BIT_XOR_EXPR/BIT_IOR_EXPR/BIT_AND_EXPR. (convert_scalar_cond_reduction): Ditto. gcc/testsuite/ChangeLog: * gcc.target/i386/ifcvt-reduction-logic-op.c: New test.
