Hi, This patch makes C/C++ FE to use boolean vector as a resulting type for vector comparison. As a result vector comparison in source code now parsed into VEC_COND_EXPR, it required a testcase fix-up.
Thanks, Ilya -- gcc/c 2015-10-02 Ilya Enkovich <enkovich....@gmail.com> * c-typeck.c (build_conditional_expr): Use boolean vector type for vector comparison. (build_vec_cmp): New. (build_binary_op): Use build_vec_cmp for comparison. gcc/cp 2015-10-02 Ilya Enkovich <enkovich....@gmail.com> * call.c (build_conditional_expr_1): Use boolean vector type for vector comparison. * typeck.c (build_vec_cmp): New. (cp_build_binary_op): Use build_vec_cmp for comparison. gcc/testsuite/ 2015-10-02 Ilya Enkovich <enkovich....@gmail.com> * g++.dg/ext/vector22.C: Allow VEC_COND_EXPR. diff --git a/gcc/c/c-typeck.c b/gcc/c/c-typeck.c index 3b26231..3f64d76 100644 --- a/gcc/c/c-typeck.c +++ b/gcc/c/c-typeck.c @@ -4771,6 +4771,18 @@ build_conditional_expr (location_t colon_loc, tree ifexp, bool ifexp_bcp, && TREE_CODE (orig_op2) == INTEGER_CST && !TREE_OVERFLOW (orig_op2))); } + + /* Need to convert condition operand into a vector mask. */ + if (VECTOR_TYPE_P (TREE_TYPE (ifexp))) + { + tree vectype = TREE_TYPE (ifexp); + tree elem_type = TREE_TYPE (vectype); + tree zero = build_int_cst (elem_type, 0); + tree zero_vec = build_vector_from_val (vectype, zero); + tree cmp_type = build_same_sized_truth_vector_type (vectype); + ifexp = build2 (NE_EXPR, cmp_type, ifexp, zero_vec); + } + if (int_const || (ifexp_bcp && TREE_CODE (ifexp) == INTEGER_CST)) ret = fold_build3_loc (colon_loc, COND_EXPR, result_type, ifexp, op1, op2); else @@ -10220,6 +10232,19 @@ push_cleanup (tree decl, tree cleanup, bool eh_only) STATEMENT_LIST_STMT_EXPR (list) = stmt_expr; } +/* Build a vector comparison using VEC_COND_EXPR. */ + +static tree +build_vec_cmp (tree_code code, tree type, + tree arg0, tree arg1) +{ + tree zero_vec = build_zero_cst (type); + tree minus_one_vec = build_minus_one_cst (type); + tree cmp_type = build_same_sized_truth_vector_type (type); + tree cmp = build2 (code, cmp_type, arg0, arg1); + return build3 (VEC_COND_EXPR, type, cmp, minus_one_vec, zero_vec); +} + /* Build a binary-operation expression without default conversions. CODE is the kind of expression to build. LOCATION is the operator's location. @@ -10786,7 +10811,8 @@ build_binary_op (location_t location, enum tree_code code, result_type = build_opaque_vector_type (intt, TYPE_VECTOR_SUBPARTS (type0)); converted = 1; - break; + ret = build_vec_cmp (resultcode, result_type, op0, op1); + goto return_build_binary_op; } if (FLOAT_TYPE_P (type0) || FLOAT_TYPE_P (type1)) warning_at (location, @@ -10938,7 +10964,8 @@ build_binary_op (location_t location, enum tree_code code, result_type = build_opaque_vector_type (intt, TYPE_VECTOR_SUBPARTS (type0)); converted = 1; - break; + ret = build_vec_cmp (resultcode, result_type, op0, op1); + goto return_build_binary_op; } build_type = integer_type_node; if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE diff --git a/gcc/cp/call.c b/gcc/cp/call.c index 367d42b..0488b82 100644 --- a/gcc/cp/call.c +++ b/gcc/cp/call.c @@ -4615,6 +4615,15 @@ build_conditional_expr_1 (location_t loc, tree arg1, tree arg2, tree arg3, if (VECTOR_INTEGER_TYPE_P (TREE_TYPE (arg1))) { + /* If arg1 is another cond_expr choosing between -1 and 0, + then we can use its comparison. It may help to avoid + additional comparison, produce more accurate diagnostics + and enables folding. */ + if (TREE_CODE (arg1) == VEC_COND_EXPR + && integer_minus_onep (TREE_OPERAND (arg1, 1)) + && integer_zerop (TREE_OPERAND (arg1, 2))) + arg1 = TREE_OPERAND (arg1, 0); + arg1 = force_rvalue (arg1, complain); arg2 = force_rvalue (arg2, complain); arg3 = force_rvalue (arg3, complain); @@ -4727,8 +4736,10 @@ build_conditional_expr_1 (location_t loc, tree arg1, tree arg2, tree arg3, } if (!COMPARISON_CLASS_P (arg1)) - arg1 = cp_build_binary_op (loc, NE_EXPR, arg1, - build_zero_cst (arg1_type), complain); + { + tree cmp_type = build_same_sized_truth_vector_type (arg1_type); + arg1 = build2 (NE_EXPR, cmp_type, arg1, build_zero_cst (arg1_type)); + } return fold_build3 (VEC_COND_EXPR, arg2_type, arg1, arg2, arg3); } diff --git a/gcc/cp/typeck.c b/gcc/cp/typeck.c index 482e42c..96b1683 100644 --- a/gcc/cp/typeck.c +++ b/gcc/cp/typeck.c @@ -3900,6 +3900,19 @@ build_binary_op (location_t location, enum tree_code code, tree op0, tree op1, return cp_build_binary_op (location, code, op0, op1, tf_warning_or_error); } +/* Build a vector comparison using VEC_COND_EXPR. */ + +static tree +build_vec_cmp (tree_code code, tree type, + tree arg0, tree arg1) +{ + tree zero_vec = build_zero_cst (type); + tree minus_one_vec = build_minus_one_cst (type); + tree cmp_type = build_same_sized_truth_vector_type(type); + tree cmp = build2 (code, cmp_type, arg0, arg1); + cmp = fold_if_not_in_template (cmp); + return build3 (VEC_COND_EXPR, type, cmp, minus_one_vec, zero_vec); +} /* Build a binary-operation expression without default conversions. CODE is the kind of expression to build. @@ -4769,7 +4782,7 @@ cp_build_binary_op (location_t location, result_type = build_opaque_vector_type (intt, TYPE_VECTOR_SUBPARTS (type0)); converted = 1; - break; + return build_vec_cmp (resultcode, result_type, op0, op1); } build_type = boolean_type_node; if ((code0 == INTEGER_TYPE || code0 == REAL_TYPE diff --git a/gcc/testsuite/g++.dg/ext/vector22.C b/gcc/testsuite/g++.dg/ext/vector22.C index daf4e19..5d28637 100644 --- a/gcc/testsuite/g++.dg/ext/vector22.C +++ b/gcc/testsuite/g++.dg/ext/vector22.C @@ -18,4 +18,3 @@ void h(vec*a){ } /* { dg-final { scan-tree-dump-not "~" "gimple" } } */ -/* { dg-final { scan-tree-dump-not "VEC_COND_EXPR" "gimple" } } */