The run-time-support library contains a number of assembly language functions that provide arithmetic routines for C/C++ math operations that the C6000 instruction set does not provide, such as integer division, integer remainder, and floating-point operations.
These routines follow the standard C/C++ calling sequence. The compiler automatically adds these routines when appropriate; they are not intended to be called directly by your programs.
The source code for these functions is in the source library rts.src. The source code has comments that describe the operation of the functions. You can extract, inspect, and modify any of the math functions. Be sure, however, that you follow the calling conventions and register-saving rules outlined in this chapter. Table 8-9 summarizes the run-time-support functions used for arithmetic.
| Type | Function | Description |
|---|---|---|
| float | __c6xabi_cvtdf (double) | Convert double to float |
| int | __c6xabi_fixdi (double) | Convert double to signed integer |
| long | __c6xabi_fixdi (double) | Convert double to long |
| long long | __c6xabi_fixdlli (double) | Convert double to long long |
| uint | __c6xabi_fixdlli (double) | Convert double to unsigned integer |
| ulong | __c6xabi_fixdul (double) | Convert double to unsigned long |
| ulong long | __c6xabi_fixdull (double) | Convert double to unsigned long long |
| double | __c6xabi_cvtfd (float) | Convert float to double |
| int | __c6xabi_fixfi (float) | Convert float to signed integer |
| long | __c6xabi_fixfli (float) | Convert float to long |
| long long | __c6xabi_fixflli (float) | Convert float to long long |
| uint | __c6xabi_fixfu (float) | Convert float to unsigned integer |
| ulong | __c6xabi_fixful (float) | Convert float to unsigned long |
| ulong long | __c6xabi_fixfull (float) | Convert float to unsigned long long |
| double | __c6xabi_fltid (int) | Convert signed integer to double |
| float | __c6xabi_fltif (int) | Convert signed integer to float |
| double | __c6xabi_fltud (uint) | Convert unsigned integer to double |
| float | __c6xabi_fltuf (uint) | Convert unsigned integer to float |
| double | __c6xabi_fltlid (long) | Convert signed long to double |
| float | __c6xabi_fltlif (long) | Convert signed long to float |
| double | __c6xabi_fltuld (ulong) | Convert unsigned long to double |
| float | __c6xabi_fltulf (ulong) | Convert unsigned long to float |
| double | __c6xabi_fltllid (long long) | Convert signed long long to double |
| float | __c6xabi_fltllif (long long) | Convert signed long long to float |
| double | __c6xabi_fltulld (ulong long) | Convert unsigned long long to double |
| float | __c6xabi_fltullf (ulong long) | Convert unsigned long long to float |
| double | __c6xabi_absd (double) | Double absolute value |
| float | __c6xabi_absf (float) | Float absolute value |
| long | __c6xabi_labs (long) | Long absolute value |
| long long | __c6xabi_llabs (long long) | Long long absolute value |
| double | __c6xabi_negd (double) | Double negate value |
| float | __c6xabi_negf (float) | Float negate value |
| long long | __c6xabi_negll (long) | Long long negate value |
| long long | __c6xabi_llshl (long long) | Long long shift left |
| long long | __c6xabi_llshr (long long) | Long long shift right |
| ulong long | __c6xabi_llshru (ulong long) | Unsigned long long shift right |
| double | __c6xabi_addd (double, double) | Double addition |
| double | __c6xabi_cmpd (double, double) | Double comparison |
| double | __c6xabi_divd (double, double) | Double division |
| double | __c6xabi_mpyd (double, double) | Double multiplication |
| double | __c6xabi_subd (double, double) | Double subtraction |
| float | __c6xabi_addf (float, float) | Float addition |
| float | __c6xabi_cmpf (float, float) | Float comparison |
| float | __c6xabi_divf (float, float) | Float division |
| float | __c6xabi_mpyf (float, float) | Float multiplication |
| float | __c6xabi_subf (float, float) | Float subtraction |
| int | __c6xabi_divi (int, int) | Signed integer division |
| int | __c6xabi_remi (int, int) | Signed integer remainder |
| uint | __c6xabi_divu (uint, uint) | Unsigned integer division |
| uint | __c6xabi_remu (uint, uint) | Unsigned integer remainder |
| long | __c6xabi_divli (long, long) | Signed long division |
| long | __c6xabi_remli (long, long) | Signed long remainder |
| ulong | __c6xabi_divul (ulong, ulong) | Unsigned long division |
| ulong | __c6xabi_remul (ulong, ulong) | Unsigned long remainder |
| long long | __c6xabi_divlii (long long, long long) | Signed long long division |
| long long | __c6xabi_remlli (long long, long long) | Signed long long remainder |
| ulong long | __c6xabi_mpyll (long long, long long) | Unsigned long long multiplication |
| ulong long | __c6xabi_divull (ulong long, ulong long) | Unsigned long long division |
| ulong long | __c6xabi_remull (ulong long, ulong long) | Unsigned long long remainder |