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Diffstat (limited to '')
| -rw-r--r-- | README | 467 |
1 files changed, 464 insertions, 3 deletions
@@ -7,9 +7,470 @@ SYNOPSIS Link with -lj2. DESCRIPTION - libj2 provides integer data types with double the width of - uintmax_t, along with functions for preforming standard - integer operations, with optional overflow-detection. + libj2 provides integer data types with double the width of uintmax_t, + along with functions for preforming standard integer operations, with + optional overflow-detection. + + libj2 provides the following value-assignment functions: + + libj2_ju_to_j2i(3), libj2_ji_to_j2i(3), libj2_ju_to_j2u(3) + Extend an intrinsic integer to an extended-precision integer. + + libj2_j2i_min(3), libj2_j2u_min(3) + Assign the minimum presentable value. + + libj2_j2i_max(3), libj2_j2u_max(3) + Assign the maximum presentable value. + + libj2_j2i_zero(3), libj2_j2u_zero(3) + Assign the value zero. + + libj2_j2u_to_j2i(3), libj2_j2i_to_j2u(3) + Convert between signed and unsigned extended-precision integer. + + libj2 provides the following string-representation functions: + + libj2_str_to_j2i(3), libj2_str_to_j2u(3), libj2_str_to_j2u_sign(3) + Parse a string-representation. + + libj2_j2i_to_str(3), libj2_j2u_to_str(3) + Create a string-representation. + + libj2 provides the following sign-shifting functions: + + libj2_abs_j2i(3), libj2_abs_j2i_to_j2i(3), libj2_abs_j2i_to_j2u(3) + Calculate the absolute value. + + libj2_minus_j2i(3), libj2_minus_j2i_to_j2i(3), libj2_minus_j2i_to_j2u(3), + libj2_minus_j2u(3), libj2_minus_j2u_to_j2i(3), libj2_minus_j2u_to_j2u(3) + Calculate the additive inverse. + + libj2_minus_abs_j2i(3), libj2_minus_abs_j2i_to_j2i(3) + Calculate the additive inverse of the absolute value. + + libj2 provides the following comparsion functions: + + libj2_j2i_cmp_j2i(3), libj2_j2i_cmp_ji(3), libj2_ji_cmp_j2i(3), + libj2_j2i_cmp_j2u(3), libj2_j2i_cmp_ju(3), libj2_ji_cmp_j2u(3), + libj2_j2u_cmp_j2i(3), libj2_j2u_cmp_ji(3), libj2_ju_cmp_j2i(3), + libj2_j2u_cmp_j2u(3), libj2_j2u_cmp_ju(3), libj2_ju_cmp_j2u(3) + Perform three-way comparision. + + libj2_j2i_eq_j2i(3), libj2_j2i_eq_ji(3), libj2_ji_eq_j2i(3), + libj2_j2i_eq_j2u(3), libj2_j2i_eq_ju(3), libj2_ji_eq_j2u(3), + libj2_j2u_eq_j2i(3), libj2_j2u_eq_ji(3), libj2_ju_eq_j2i(3), + libj2_j2u_eq_j2u(3), libj2_j2u_eq_ju(3), libj2_ju_eq_j2u(3) + Check whether two values are equal. + + libj2_j2i_ne_j2i(3), libj2_j2i_ne_ji(3), libj2_ji_ne_j2i(3), + libj2_j2i_ne_j2u(3), libj2_j2i_ne_ju(3), libj2_ji_ne_j2u(3), + libj2_j2u_ne_j2i(3), libj2_j2u_ne_ji(3), libj2_ju_ne_j2i(3), + libj2_j2u_ne_j2u(3), libj2_j2u_ne_ju(3), libj2_ju_ne_j2u(3) + Check whether two values are different. + + libj2_j2i_lt_j2i(3), libj2_j2i_lt_ji(3), libj2_ji_lt_j2i(3), + libj2_j2i_lt_j2u(3), libj2_j2i_lt_ju(3), libj2_ji_lt_j2u(3), + libj2_j2u_lt_j2i(3), libj2_j2u_lt_ji(3), libj2_ju_lt_j2i(3), + libj2_j2u_lt_j2u(3), libj2_j2u_lt_ju(3), libj2_ju_lt_j2u(3) + Check whether a value is less than another value. + + libj2_j2i_le_j2i(3), libj2_j2i_le_ji(3), libj2_ji_le_j2i(3), + libj2_j2i_le_j2u(3), libj2_j2i_le_ju(3), libj2_ji_le_j2u(3), + libj2_j2u_le_j2i(3), libj2_j2u_le_ji(3), libj2_ju_le_j2i(3), + libj2_j2u_le_j2u(3), libj2_j2u_le_ju(3), libj2_ju_le_j2u(3) + Check whether a value is less than another value + or equal to it. + + libj2_j2i_gt_j2i(3), libj2_j2i_gt_ji(3), libj2_ji_gt_j2i(3), + libj2_j2i_gt_j2u(3), libj2_j2i_gt_ju(3), libj2_ji_gt_j2u(3), + libj2_j2u_gt_j2i(3), libj2_j2u_gt_ji(3), libj2_ju_gt_j2i(3), + libj2_j2u_gt_j2u(3), libj2_j2u_gt_ju(3), libj2_ju_gt_j2u(3) + Check whether a value is greater than another value. + + libj2_j2i_ge_j2i(3), libj2_j2i_ge_ji(3), libj2_ji_ge_j2i(3), + libj2_j2i_ge_j2u(3), libj2_j2i_ge_ju(3), libj2_ji_ge_j2u(3), + libj2_j2u_ge_j2i(3), libj2_j2u_ge_ji(3), libj2_ju_ge_j2i(3), + libj2_j2u_ge_j2u(3), libj2_j2u_ge_ju(3), libj2_ju_ge_j2u(3) + Check whether a value is greater than another value + or eqaul to it. + + libj2_j2i_is_min(3), libj2_j2u_is_min(3) + Check whether a value is the minimum presentable value. + + libj2_j2i_is_max(3), libj2_j2u_is_max(3) + Check whether a value is the maximum presentable value. + + libj2_j2i_is_zero(3), libj2_j2u_is_zero(3) + Check whether a value is the value zero. + + libj2_j2i_is_positive(3), libj2_j2u_is_positive(3) + Check whether a value is positive. + + libj2_j2i_is_negative(3) + Check whether a value is negative. + + libj2_sgn_j2i(3), libj2_sgn_j2u(3) + Perform three-way comparision against the value zero (get the + signum of a value). + + libj2_j2i_max_j2i(3), libj2_j2i_max_j2i_to_j2i(3), + libj2_j2i_max_ji(3), libj2_j2i_max_ji_to_j2i(3), + libj2_j2u_max_j2u(3), libj2_j2u_max_j2u_to_j2u(3), + libj2_j2u_max_ju(3), libj2_j2u_max_ju_to_j2u(3) + Get the maximum of two values. + + libj2_max_j2i(3), libj2_max_j2i_to_j2i(3), libj2_max_j2i_return(3), + libj2_max_j2u(3), libj2_max_j2u_to_j2u(3), libj2_max_j2u_return(3), + libj2_vmax_j2i(3), libj2_vmax_j2i_to_j2i(3), libj2_vmax_j2i_return(3), + libj2_vmax_j2u(3), libj2_vmax_j2u_to_j2u(3), libj2_vmax_j2u_return(3) + Get the maximum of a list of values. + + libj2_j2i_min_j2i(3), libj2_j2i_min_j2i_to_j2i(3), + libj2_j2i_min_ji(3), libj2_j2i_min_ji_to_j2i(3), + libj2_j2u_min_j2u(3), libj2_j2u_min_j2u_to_j2u(3), + libj2_j2u_min_ju(3), libj2_j2u_min_ju_to_j2u(3) + Get the minimum of two values. + + libj2_min_j2i(3), libj2_min_j2i_to_j2i(3), libj2_min_j2i_return(3), + libj2_min_j2u(3), libj2_min_j2u_to_j2u(3), libj2_min_j2u_return(3), + libj2_vmin_j2i(3), libj2_vmin_j2i_to_j2i(3), libj2_vmin_j2i_return(3), + libj2_vmin_j2u(3), libj2_vmin_j2u_to_j2u(3), libj2_vmin_j2u_return(3) + Get the minimum of a list of values. + + libj2 provides the following bitwise logic functions: + + libj2_not_j2u(3), libj2_not_j2u_to_j2u(3), libj2_not_ju_to_j2u(3) + Flip all bits. + + libj2_j2i_xor_sign(3), libj2_j2i_xor_sign_to_j2i(3), + libj2_j2i_xor_sign_to_j2u(3) + Flip all bits if the sign-bit is set (if the value is negative). + + libj2_j2u_and_bit(3), libj2_j2u_and_bit_to_j2u(3) + Calculate the bitwise AND of the value and the value where one + specific bit is set and all other bits are cleared. + + libj2_j2u_and_j2u(3), libj2_j2u_and_j2u_to_j2u(3), + libj2_j2u_and_ju(3), libj2_j2u_and_ju_to_j2u(3), + libj2_ju_and_j2u_to_j2u(3) + Calculate the bitwise AND of two values. + + libj2_j2u_or_bit(3), libj2_j2u_or_bit_to_j2u(3) + Calculate the bitwise OR of the value and the value where one + specific bit is set and all other bits are cleared. + + libj2_j2u_or_j2u(3), libj2_j2u_or_j2u_to_j2u(3), + libj2_j2u_or_ju(3), libj2_j2u_or_ju_to_j2u(3), + libj2_ju_or_j2u_to_j2u(3) + Calculate the bitwise OR of two values. + + libj2_j2u_xor_bit(3), libj2_j2u_xor_bit_to_j2u(3) + Calculate the bitwise XOR of the value and the value where one + specific bit is set and all other bits are cleared. + + libj2_j2u_xor_j2u(3), libj2_j2u_xor_j2u_to_j2u(3), + libj2_j2u_xor_ju(3), libj2_j2u_xor_ju_to_j2u(3), + libj2_ju_xor_j2u_to_j2u(3) + Calculate the bitwise XOR of two values. + + libj2_j2u_if_bit(3), libj2_j2u_if_bit_to_j2u(3) + Calculate the bitwise IF of the value and the value where one + specific bit is set and all other bits are cleared. + + libj2_j2u_if_j2u(3), libj2_j2u_if_j2u_to_j2u(3), + libj2_j2u_if_ju(3), libj2_j2u_if_ju_to_j2u(3), + libj2_ju_if_j2u_to_j2u(3) + Calculate the bitwise IF of two values. + + libj2_j2u_imply_bit(3), libj2_j2u_imply_bit_to_j2u(3) + Calculate the bitwise IMPLY of the value and the value where one + specific bit is set and all other bits are cleared. + + libj2_j2u_imply_j2u(3), libj2_j2u_imply_j2u_to_j2u(3), + libj2_j2u_imply_ju(3), libj2_j2u_imply_ju_to_j2u(3), + libj2_ju_imply_j2u_to_j2u(3) + Calculate the bitwise IMPLY of two values. + + libj2_j2u_nand_bit(3), libj2_j2u_nand_bit_to_j2u(3) + Calculate the bitwise NAND of the value and the value where one + specific bit is set and all other bits are cleared. + + libj2_j2u_nand_j2u(3), libj2_j2u_nand_j2u_to_j2u(3), + libj2_j2u_nand_ju(3), libj2_j2u_nand_ju_to_j2u(3), + libj2_ju_nand_j2u_to_j2u(3) + Calculate the bitwise NAND of two values. + + libj2_j2u_nor_bit(3), libj2_j2u_nor_bit_to_j2u(3) + Calculate the bitwise NOR of the value and the value where one + specific bit is set and all other bits are cleared. + + libj2_j2u_nor_j2u(3), libj2_j2u_nor_j2u_to_j2u(3), + libj2_j2u_nor_ju(3), libj2_j2u_nor_ju_to_j2u(3), + libj2_ju_nor_j2u_to_j2u(3) + Calculate the bitwise NOR of two values. + + libj2_j2u_xnor_bit(3), libj2_j2u_xnor_bit_to_j2u(3) + Calculate the bitwise XNOR of the value and the value where one + specific bit is set and all other bits are cleared. + + libj2_j2u_xnor_j2u(3), libj2_j2u_xnor_j2u_to_j2u(3), + libj2_j2u_xnor_ju(3), libj2_j2u_xnor_ju_to_j2u(3), + libj2_ju_xnor_j2u_to_j2u(3) + Calculate the bitwise XNOR of two values. + + libj2_j2u_nif_bit(3), libj2_j2u_nif_bit_to_j2u(3) + Calculate the bitwise NIF of the value and the value where one + specific bit is set and all other bits are cleared. + + libj2_j2u_nif_j2u(3), libj2_j2u_nif_j2u_to_j2u(3), + libj2_j2u_nif_ju(3), libj2_j2u_nif_ju_to_j2u(3), + libj2_ju_nif_j2u_to_j2u(3) + Calculate the bitwise NIF of two values. + + libj2_j2u_nimply_bit(3), libj2_j2u_nimply_bit_to_j2u(3) + Calculate the bitwise NIMPLY of the value and the value where + one specific bit is set and all other bits are cleared. + + libj2_j2u_nimply_j2u(3), libj2_j2u_nimply_j2u_to_j2u(3), + libj2_j2u_nimply_ju(3), libj2_j2u_nimply_ju_to_j2u(3), + libj2_ju_nimply_j2u_to_j2u(3) + Calculate the bitwise NIMPLY of two values. + + libj2_j2u_test_bit(3) + Check whether a specific bit is set. + + libj2_j2u_test_j2u(3), libj2_j2u_test_ju(3), libj2_j2u_test_high_ju(3) + Check whether two values any set bits in common. + + libj2_j2u_has_j2u(3), libj2_j2u_has_ju(3), libj2_j2u_has_high_ju(3) + Check whether a value have all set bits in another value + also set in it. + + libj2 provides the following bit-shifting functions: + + libj2_j2i_lsh(3), libj2_j2i_lsh_to_j2i(3), libj2_ji_lsh_to_j2i(3), + libj2_j2u_lsh(3), libj2_j2u_lsh_to_j2u(3), libj2_ju_lsh_to_j2u(3) + Left-shift a value. + + libj2_j2i_lsh_overflow(3), libj2_j2i_lsh_to_j2i_overflow(3), + libj2_ji_lsh_to_j2i_overflow(3), libj2_j2u_lsh_overflow(3), + libj2_j2u_lsh_to_j2u_overflow(3), libj2_ju_lsh_to_j2u_overflow(3) + Left-shift a value, and detect overflow. + + libj2_j2i_lsh_overflow_p(3), libj2_j2u_lsh_overflow_p(3), + libj2_ji_lsh_overflow_p(3), libj2_ju_lsh_overflow_p(3) + Predict overflow of left-shifting a value. + + libj2_j2u_sat_lsh(3), libj2_j2u_sat_lsh_to_j2u(3), + libj2_ju_sat_lsh_to_j2u(3) + Left-shift a value, but saturate on overflow. + + libj2_j2i_rsh(3), libj2_j2i_rsh_to_j2i(3), libj2_ji_rsh_to_j2i(3), + libj2_j2u_rsh(3), libj2_j2u_rsh_to_j2u(3), libj2_ju_rsh_to_j2u(3) + Right-shift a value. + + libj2_j2i_rsh_underflow(3), libj2_j2i_rsh_to_j2i_underflow(3), + libj2_ji_rsh_to_j2i_underflow(3), libj2_j2u_rsh_underflow(3), + libj2_j2u_rsh_to_j2u_underflow(3), libj2_ju_rsh_to_j2u_underflow(3) + Right-shift a value, and detect underflow. + + libj2_j2i_rsh_underflow_p(3), libj2_ji_rsh_underflow_p(3), + libj2_j2u_rsh_underflow_p(3), libj2_ju_rsh_underflow_p(3) + Predict underflow of right-shifting a value. + + libj2_j2u_lrot(3), libj2_j2u_lrot_to_j2u(3), libj2_ju_lrot_to_j2u(3) + Left-rotate a value. + + libj2_j2u_rrot(3), libj2_j2u_rrot_to_j2u(3), libj2_ju_rrot_to_j2u(3) + Right-rotate a value. + + libj2 provides the following bit-scanning functions: + + libj2_clo_j2u(3) + Count leading set bits. + + libj2_clz_j2u(3) + Count leading cleared bits. + + libj2_cto_j2u(3) + Count trailing set bits. + + libj2_ctz_j2u(3) + Count trailing cleared bits. + + libj2_co_j2u(3) + Count set bits. + + libj2_cz_j2u(3) + Count cleared bits. + + libj2_parity_j2u(3) + Calculate the parity of the set bits (check whether the number + of set bits is odd). + + libj2_fls_j2u(3) + Find the most significant set bit. + + libj2_flc_j2u(3) + Find the most significant cleared bit. + + libj2_ffs_j2u(3) + Find the least significant set bit. + + libj2_ffc_j2u(3) + Find the least significant cleared bit. + + libj2_kls_j2u(3), libj2_kls_j2u_to_j2u(3) + Clear all but the most significant set bit. + + libj2_kfs_j2u(3), libj2_kfs_j2u_to_j2u(3) + Clear all but the least significant set bit. + + libj2_cls_j2u(3), libj2_cls_j2u_to_j2u(3) + Clear the most significant set bit. + + libj2_cfs_j2u(3), libj2_cfs_j2u_to_j2u(3) + Clear the least significant set bit. + + libj2_slc_j2u(3), libj2_slc_j2u_to_j2u(3) + Set the most significant cleared bit. + + libj2_sfc_j2u(3), libj2_sfc_j2u_to_j2u(3) + Set the least significant cleared bit. + + libj2 provides the following arithmetic functions: + + libj2_j2u_add_j2u(3), libj2_j2u_add_j2u_to_j2u(3), + libj2_j2u_add_ju(3), libj2_j2u_add_ju_to_j2u(3), + libj2_ju_add_j2u_to_j2u(3), libj2_ju_add_ju_to_j2u(3) + Calculate the sum of two values. + + libj2_j2u_add_j2u_overflow(3), libj2_j2u_add_j2u_to_j2u_overflow(3), + libj2_j2u_add_ju_overflow(3), libj2_j2u_add_ju_to_j2u_overflow(3), + libj2_ju_add_j2u_to_j2u_overflow(3) + Calculate the sum of two values, and detect overflow. + + libj2_j2u_add_j2u_overflow_p(3), libj2_j2u_add_ju_overflow_p(3), + libj2_ju_add_j2u_overflow_p(3) + Predict whether adding two values will result in an overflow. + + libj2_j2u_sat_add_j2u(3), libj2_j2u_sat_add_j2u_to_j2u(3), + libj2_j2u_sat_add_ju(3), libj2_j2u_sat_add_ju_to_j2u(3), + libj2_ju_sat_add_j2u_to_j2u(3) + Calculate the sum of two values, but saturate on overflow. + + libj2_j2u_sub_j2u(3), libj2_j2u_sub_j2u_to_j2u(3), + libj2_j2u_sub_ju(3), libj2_j2u_sub_ju_to_j2u(3), + libj2_ju_sub_j2u_to_j2u(3), libj2_ju_sub_ju_to_j2u(3) + Calculate the difference between two values. + + libj2_j2u_rsub_j2u(3), libj2_j2u_rsub_ju(3) + Calculate the difference between two values. These functions + swap the position of the two operands. + + libj2_j2u_sub_j2u_overflow(3), libj2_j2u_sub_j2u_to_j2u_overflow(3), + libj2_j2u_sub_ju_overflow(3), libj2_j2u_sub_ju_to_j2u_overflow(3), + libj2_ju_sub_j2u_to_j2u_overflow(3), libj2_ju_sub_ju_to_j2u_overflow(3) + Calculate the difference between two values, and detect + overflow. + + libj2_j2u_rsub_j2u_overflow(3), libj2_j2u_rsub_ju_overflow(3) + Calculate the difference between two values, and detect + overflow. These functions swap the position of the two operands. + + libj2_j2u_sub_j2u_overflow_p(3), libj2_j2u_sub_ju_overflow_p(3), + libj2_ju_sub_j2u_overflow_p(3), libj2_ju_sub_ju_overflow_p(3) + Predict whether subtracting a value will result in an overflow. + + libj2_j2u_rsub_j2u_overflow_p(3), libj2_j2u_rsub_ju_overflow_p(3) + Predict whether subtracting a value will result in an overflow. + These functions swap the position of the two operands. + + libj2_j2u_sat_sub_j2u(3), libj2_j2u_sat_sub_j2u_to_j2u(3), + libj2_j2u_sat_sub_ju(3), libj2_j2u_sat_sub_ju_to_j2u(3), + libj2_ju_sat_sub_j2u_to_j2u(3), libj2_ju_sat_sub_ju_to_j2u(3) + Calculate the difference between two values, but saturate on + overflow. + + libj2_j2u_sat_rsub_j2u(3), libj2_j2u_sat_rsub_ju(3) + Calculate the difference between two values, but saturate on + overflow. These functions swap the position of the two operands. + + libj2_j2u_mul_j2u(3), libj2_j2u_mul_j2u_to_j2u(3), + libj2_j2u_mul_ju(3), libj2_j2u_mul_ju_to_j2u(3), + libj2_ju_mul_j2u_to_j2u(3), libj2_ju_mul_ju_to_j2u(3), + libj2_j2u_mul_j2u_destructive(3) + Calculate the product of two values. + + libj2_j2u_mul_j2u_overflow(3), libj2_j2u_mul_j2u_to_j2u_overflow(3), + libj2_j2u_mul_ju_overflow(3), libj2_j2u_mul_ju_to_j2u_overflow(3), + libj2_ju_mul_j2u_to_j2u_overflow(3), + libj2_j2u_mul_j2u_overflow_destructive(3) + Calculate the product of two values, and detect overflow. + + libj2_j2u_mul_j2u_overflow_p(3), libj2_j2u_mul_ju_overflow_p(3), + libj2_ju_mul_j2u_overflow_p(3) + Predict whether multiplying two values will result in an + overflow. + + libj2_j2u_mul_j2u_overflow_p_quick(3), + libj2_j2u_mul_ju_overflow_p_quick(3), + libj2_ju_mul_j2u_overflow_p_quick(3) + Predict whether multiplying two values will result in an + overflow, but do not preform the prediction if it is costly. + + libj2_j2u_mul_j2u_to_j2u_overflow_p(3), + libj2_j2u_mul_ju_to_j2u_overflow_p(3), + libj2_ju_mul_j2u_to_j2u_overflow_p(3) + Predict whether multiplying two values will result in an + overflow, and if the prediction is costly, perform the + multiplication. + + libj2_j2u_sat_mul_j2u(3), libj2_j2u_sat_mul_j2u_to_j2u(3), + libj2_j2u_sat_mul_ju(3), libj2_j2u_sat_mul_ju_to_j2u(3), + libj2_ju_sat_mul_j2u_to_j2u(3), libj2_j2u_sat_mul_j2u_destructive(3) + Calculate the product of two values, but saturate on overflow. + + libj2_j2u_divmod_j2u(3), libj2_j2u_divmod_j2u_to_j2u(3), + libj2_j2u_divmod_j2u_to_j2u_j2u(3), libj2_j2u_divmod_ju(3), + libj2_j2u_divmod_ju_to_j2u(3), libj2_j2u_divmod_ju_to_j2u_j2u(3) + Calculate the ratio between values, and keep the computed + remainder. + + libj2_j2u_rdivmod_j2u(3), libj2_j2u_rdivmod_j2u_to_j2u(3) + Calculate the ratio between values, and keep the computed + remainder. These functions swap the position of the two + operands. + + libj2_j2u_div_j2u(3), libj2_j2u_div_j2u_to_j2u(3), + libj2_j2u_div_j2u_return(3), libj2_j2u_div_ju(3), + libj2_j2u_div_ju_to_j2u(3), libj2_j2u_div_ju_return(3) + Calculate the ratio between values, and discard the + computed remainder. + + libj2_j2u_rdiv_j2u(3) + Calculate the ratio between values, and discard the + computed remainder. This function swaps the position of the two + operands. + + libj2_j2u_div_j2u_to_j2u_underflow(3), libj2_j2u_div_j2u_underflow(3), + libj2_j2u_div_ju_to_j2u_underflow(3), libj2_j2u_div_ju_underflow(3) + Calculate the ratio between values, and discard the + computed remainder, but detect underflow (non-zero remainder). + + libj2_j2u_rdiv_j2u_underflow(3) + Calculate the ratio between values, and discard the + computed remainder, but detect underflow (non-zero remainder). + This function swaps the position of the two operands. + + libj2_j2u_mod_j2u(3), libj2_j2u_mod_j2u_to_j2u(3), libj2_j2u_mod_ju(3), + libj2_j2u_mod_ju_to_j2u(3) + Calculate the remainder of the integer division between two + values. + + libj2_j2u_rmod_j2u(3) + Calculate the remainder of the integer division between two + values. This function swaps the position of the two operands. SEE ALSO libzahl(7) |