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From: Andrew Macleod <amacleod@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-2793] Convert CFN_CLZ builtins to range-ops. Date: Thu, 22 Sep 2022 18:49:48 +0000 (GMT) [thread overview] Message-ID: <20220922184948.2FCE23858005@sourceware.org> (raw) https://gcc.gnu.org/g:ae1669a98656cca594fcd2fef6bd2cd7308a361f commit r13-2793-gae1669a98656cca594fcd2fef6bd2cd7308a361f Author: Andrew MacLeod <amacleod@redhat.com> Date: Tue Sep 20 18:12:25 2022 -0400 Convert CFN_CLZ builtins to range-ops. * gimple-range-fold.cc (range_of_builtin_int_call): Remove case for CFN_CLZ. * gimple-range-op.cc (class cfn_clz): New. (gimple_range_op_handler::maybe_builtin_call): Set arguments. Diff: --- gcc/gimple-range-fold.cc | 61 ----------------------------------- gcc/gimple-range-op.cc | 84 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 84 insertions(+), 61 deletions(-) diff --git a/gcc/gimple-range-fold.cc b/gcc/gimple-range-fold.cc index ca531037e13..63eaa90be96 100644 --- a/gcc/gimple-range-fold.cc +++ b/gcc/gimple-range-fold.cc @@ -926,67 +926,6 @@ fold_using_range::range_of_builtin_int_call (irange &r, gcall *call, r.set (build_zero_cst (type), build_one_cst (type)); return true; - CASE_CFN_CLZ: - // __builtin_c[lt]z* return [0, prec-1], except when the - // argument is 0, but that is undefined behavior. - // - // For __builtin_c[lt]z* consider argument of 0 always undefined - // behavior, for internal fns depending on C?Z_DEFINED_VALUE_AT_ZERO. - arg = gimple_call_arg (call, 0); - prec = TYPE_PRECISION (TREE_TYPE (arg)); - mini = 0; - maxi = prec - 1; - mode = SCALAR_INT_TYPE_MODE (TREE_TYPE (arg)); - if (gimple_call_internal_p (call)) - { - if (optab_handler (clz_optab, mode) != CODE_FOR_nothing - && CLZ_DEFINED_VALUE_AT_ZERO (mode, zerov) == 2) - { - // Only handle the single common value. - if (zerov == prec) - maxi = prec; - else - // Magic value to give up, unless we can prove arg is non-zero. - mini = -2; - } - } - - src.get_operand (r, arg); - // From clz of minimum we can compute result maximum. - if (!r.undefined_p ()) - { - // From clz of minimum we can compute result maximum. - if (wi::gt_p (r.lower_bound (), 0, TYPE_SIGN (r.type ()))) - { - maxi = prec - 1 - wi::floor_log2 (r.lower_bound ()); - if (mini == -2) - mini = 0; - } - else if (!range_includes_zero_p (&r)) - { - mini = 0; - maxi = prec - 1; - } - if (mini == -2) - break; - // From clz of maximum we can compute result minimum. - wide_int max = r.upper_bound (); - int newmini = prec - 1 - wi::floor_log2 (max); - if (max == 0) - { - // If CLZ_DEFINED_VALUE_AT_ZERO is 2 with VALUE of prec, - // return [prec, prec], otherwise ignore the range. - if (maxi == prec) - mini = prec; - } - else - mini = newmini; - } - if (mini == -2) - break; - r.set (build_int_cst (type, mini), build_int_cst (type, maxi)); - return true; - CASE_CFN_CTZ: // __builtin_ctz* return [0, prec-1], except for when the // argument is 0, but that is undefined behavior. diff --git a/gcc/gimple-range-op.cc b/gcc/gimple-range-op.cc index 84837f8ee43..caba49309f9 100644 --- a/gcc/gimple-range-op.cc +++ b/gcc/gimple-range-op.cc @@ -414,6 +414,81 @@ public: } } op_cfn_popcount; +// Implement range operator for CFN_BUILT_IN_CLZ +class cfn_clz : public range_operator +{ +public: + cfn_clz (bool internal) { m_gimple_call_internal_p = internal; } + using range_operator::fold_range; + virtual bool fold_range (irange &r, tree type, const irange &lh, + const irange &, relation_kind) const; +private: + bool m_gimple_call_internal_p; +} op_cfn_clz (false), op_cfn_clz_internal (true); + +bool +cfn_clz::fold_range (irange &r, tree type, const irange &lh, + const irange &, relation_kind) const +{ + // __builtin_c[lt]z* return [0, prec-1], except when the + // argument is 0, but that is undefined behavior. + // + // For __builtin_c[lt]z* consider argument of 0 always undefined + // behavior, for internal fns depending on C?Z_DEFINED_ALUE_AT_ZERO. + if (lh.undefined_p ()) + return false; + int prec = TYPE_PRECISION (lh.type ()); + int mini = 0; + int maxi = prec - 1; + int zerov = 0; + scalar_int_mode mode = SCALAR_INT_TYPE_MODE (lh.type ()); + if (m_gimple_call_internal_p) + { + if (optab_handler (clz_optab, mode) != CODE_FOR_nothing + && CLZ_DEFINED_VALUE_AT_ZERO (mode, zerov) == 2) + { + // Only handle the single common value. + if (zerov == prec) + maxi = prec; + else + // Magic value to give up, unless we can prove arg is non-zero. + mini = -2; + } + } + + // From clz of minimum we can compute result maximum. + if (wi::gt_p (lh.lower_bound (), 0, TYPE_SIGN (lh.type ()))) + { + maxi = prec - 1 - wi::floor_log2 (lh.lower_bound ()); + if (mini == -2) + mini = 0; + } + else if (!range_includes_zero_p (&lh)) + { + mini = 0; + maxi = prec - 1; + } + if (mini == -2) + return false; + // From clz of maximum we can compute result minimum. + wide_int max = lh.upper_bound (); + int newmini = prec - 1 - wi::floor_log2 (max); + if (max == 0) + { + // If CLZ_DEFINED_VALUE_AT_ZERO is 2 with VALUE of prec, + // return [prec, prec], otherwise ignore the range. + if (maxi == prec) + mini = prec; + } + else + mini = newmini; + + if (mini == -2) + return false; + r.set (build_int_cst (type, mini), build_int_cst (type, maxi)); + return true; +} + // Set up a gimple_range_op_handler for any built in function which can be // supported via range-ops. @@ -469,6 +544,15 @@ gimple_range_op_handler::maybe_builtin_call () m_valid = true; break; + CASE_CFN_CLZ: + m_op1 = gimple_call_arg (call, 0); + m_valid = true; + if (gimple_call_internal_p (call)) + m_int = &op_cfn_clz_internal; + else + m_int = &op_cfn_clz; + break; + default: break; }
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