From: Ju-Zhe Zhong <juzhe.zh...@rivai.ai> Hi, Richi.
Sorry for making mistake on LEN_MASK_GATHER_LOAD/LEN_MASK_SCATTER_STORE with SELECT_VL loop control. Consider this following case: #define TEST_LOOP(DATA_TYPE, BITS) \ void __attribute__ ((noinline, noclone)) \ f_##DATA_TYPE##_##BITS (DATA_TYPE *restrict dest, DATA_TYPE *restrict src, \ INDEX##BITS stride, INDEX##BITS n) \ { \ for (INDEX##BITS i = 0; i < n; ++i) \ dest[i] += src[i * stride]; \ } When "stride" is a constant, current flow works fine. However, when "stride" is a variable. It causes an ICE: # vectp_src.67_85 = PHI <vectp_src.67_86(6), src_21(D)(12)> ... _96 = .SELECT_VL (ivtmp_94, 4); ... ivtmp_78 = ((sizetype) _39 * (sizetype) _96) * 4; vect__11.69_87 = .LEN_MASK_GATHER_LOAD (vectp_src.67_85, _84, 4, { 0, 0, 0, 0 }, { -1, -1, -1, -1 }, _96, 0); ... vectp_src.67_86 = vectp_src.67_85 + ivtmp_78; Becase the IR: ivtmp_78 = ((sizetype) _39 * (sizetype) _96) * 4; Instead, I split the IR into: step_stride = _39 step = step_stride * 4 ivtmp_78 = step * _96 I don't think this patch's code is elegant enough, could you help me refine these codes? Thanks. gcc/ChangeLog: * tree-vect-stmts.cc (vect_get_strided_load_store_ops): Fix ICE. --- gcc/tree-vect-stmts.cc | 38 +++++++++++++++++++++++++++++++++----- 1 file changed, 33 insertions(+), 5 deletions(-) diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc index c10a4be60eb..12d1b0f1ac0 100644 --- a/gcc/tree-vect-stmts.cc +++ b/gcc/tree-vect-stmts.cc @@ -3172,12 +3172,40 @@ vect_get_strided_load_store_ops (stmt_vec_info stmt_info, vectp_a.9_26 = vectp_a.9_7 + ivtmp_8; */ tree loop_len = vect_get_loop_len (loop_vinfo, gsi, loop_lens, 1, vectype, 0, 0); - tree tmp - = fold_build2 (MULT_EXPR, sizetype, - fold_convert (sizetype, unshare_expr (DR_STEP (dr))), - loop_len); + tree tmp; + gassign *assign; + + if (TREE_CODE (DR_STEP (dr)) == INTEGER_CST) + tmp = fold_build2 (MULT_EXPR, sizetype, + fold_convert (sizetype, unshare_expr (DR_STEP (dr))), + loop_len); + else + { + /* If DR_STEP = (unsigned int) _37 * 4; + Extract _37 and 4, explicit MULT_EXPR. */ + + /* 1. step_stride = (unsigned int) _37. */ + tree step_stride = make_ssa_name (create_tmp_var (sizetype)); + assign = gimple_build_assign ( + step_stride, TREE_OPERAND (TREE_OPERAND (DR_STEP (dr), 0), 0)); + gsi_insert_before (gsi, assign, GSI_SAME_STMT); + + /* 2. step = step_stride * 4. */ + tree step_align = TREE_OPERAND (TREE_OPERAND (DR_STEP (dr), 0), 1); + tree step = make_ssa_name (create_tmp_var (sizetype)); + assign + = gimple_build_assign (step, fold_build2 (MULT_EXPR, sizetype, + step_stride, step_align)); + gsi_insert_before (gsi, assign, GSI_SAME_STMT); + + /* 3. tmp = step * loop_len. */ + tmp = make_ssa_name (create_tmp_var (sizetype)); + assign = gimple_build_assign (tmp, fold_build2 (MULT_EXPR, sizetype, + step, loop_len)); + gsi_insert_before (gsi, assign, GSI_SAME_STMT); + } tree bump = make_temp_ssa_name (sizetype, NULL, "ivtmp"); - gassign *assign = gimple_build_assign (bump, tmp); + assign = gimple_build_assign (bump, tmp); gsi_insert_before (gsi, assign, GSI_SAME_STMT); *dataref_bump = bump; } -- 2.36.3