diff options
Diffstat (limited to 'src/import/generic/memory/lib/utils/mss_math.H')
| -rw-r--r-- | src/import/generic/memory/lib/utils/mss_math.H | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/src/import/generic/memory/lib/utils/mss_math.H b/src/import/generic/memory/lib/utils/mss_math.H index b60cbc2ae..ebb3da8e3 100644 --- a/src/import/generic/memory/lib/utils/mss_math.H +++ b/src/import/generic/memory/lib/utils/mss_math.H @@ -5,7 +5,7 @@ /* */ /* OpenPOWER HostBoot Project */ /* */ -/* Contributors Listed Below - COPYRIGHT 2017 */ +/* Contributors Listed Below - COPYRIGHT 2017,2019 */ /* [+] International Business Machines Corp. */ /* */ /* */ @@ -71,6 +71,42 @@ inline int64_t round_half_away_from_zero( const double i_input ) return ( i_input < 0.0 ? static_cast<int64_t>(i_input - 0.5) : static_cast<int64_t>(i_input + 0.5) ); } +/// +/// @brief Divide and round unsigned values +/// @tparam T input and output types +/// @param[in] i_divisor the divisor (number to be divided) +/// @param[in] i_dividend the dividend (number to divide by) +/// @param[out] o_quotient the quotient +/// @return FAPI2_RC_SUCCESS iff successful +/// +template<typename T> +inline fapi2::ReturnCode divide_and_round( const T i_divisor, + const T i_dividend, + T& o_quotient ) +{ + o_quotient = 0; + + // Zero dividend would cause a divide-by-zero, so prevent that + FAPI_ASSERT( (i_dividend != 0), + fapi2::MSS_DIVIDE_BY_ZERO() + .set_DIVISOR(i_divisor) + .set_DIVIDEND(i_dividend), + "Caught an attempt to divide by zero (%d / %d)", + i_divisor, i_dividend ); + + { + const auto l_quotient_unrounded = i_divisor / i_dividend; + const auto l_remainder = i_divisor % i_dividend; + + // Round the quotient up or down depending on the remainder + o_quotient = l_quotient_unrounded + ((l_remainder >= i_dividend / 2) ? 1 : 0); + } + return fapi2::FAPI2_RC_SUCCESS; + +fapi_try_exit: + return fapi2::current_err; +} + }// mss |
