The run-time-support library contains a number of assembly language functions that provide arithmetic routines for C/C++ math operations that the C7000 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 provided in the lib/src source directory. 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 6-3 summarizes the run-time-support functions used for arithmetic.
| Return Type | C Function | Description |
|---|---|---|
| void | __c7xabi_abort_msg (const char *) | Report failed assertion. (See notes below.) |
| double | __c7xabi_divd (double, double) | Divide two double-precision floats. |
| float | __c7xabi_divf (float, float) | Divide two single-precision floats. |
| int | __c7xabi_divi (int, int) | 32-bit signed integer division. |
| long long | __c7xabi_divlli (long long, long long) | 64-bit signed integer division. |
| unsigned | __c7xabi_divu (unsigned, unsigned) | 32-bit unsigned integer division. |
| unsigned long long | __c7xabi_divull (unsigned long long, unsigned long long) | 64-bit unsigned integer division. |
| long long | __c7xabi_fixdlli (double) | Convert double-precision float to 64-bit integer. |
| unsigned | __c7xabi_fixdu (double) | Convert double-precision float to 32-bit unsigned integer. |
| unsigned long long | __c7xabi_fixdull (double) | Convert double-precision float to 64-bit unsigned integer. |
| long long | __c7xabi_fixflli (float) | Convert single-precision float to 64-bit integer. |
| unsigned | __c7xabi_fixfu (float) | Convert single-precision float to 32-bit unsigned integer. |
| unsigned long long | __c7xabi_fixfull (float) | Convert single-precision float to 64-bit unsigned integer. |
| double | __c7xabi_fltllid (long long) | Convert 64-bit integer to double-precision float. |
| float | __c7xabi_fltllif (long long) | Convert 64-bit integer to single-precision float. |
| double | __c7xabi_fltud (unsigned) | Convert 32-bit unsigned integer to double-precision float. |
| float | __c7xabi_fltuf (unsigned) | Convert 32-bit unsigned integer to single-precision float. |
| double | __c7xabi_fltulld (unsigned long long) | Convert 64-bit unsigned integer to double-precision float. |
| float | __c7xabi_fltullf (unsigned long long) | Convert 64-bit unsigned integer to single-precision float. |
| int | __c7xabi_remi (int, int) | 32-bit integer modulo. |
| long long | __c7xabi_remlli (long long, long long) | 64-bit integer modulo. |
| unsigned | __c7xabi_remu (unsigned, unsigned) | 32-bit unsigned integer modulo. |
| unsigned long long | __c7xabi_remull (unsigned long long, unsigned long long) | 64-bit unsigned integer modulo. |
| void | __c7xabi_strasg (int*, const int*, unsigned) | Block copy. (See notes below.) |
| __c7xabi_unwind_cpp_pr0 | Short frame unwinding, 16-bit scope. | |
| __c7xabi_unwind_cpp_pr1 | Long frame unwinding, 16-bit scope. | |
| __c7xabi_unwind_cpp_pr2 | Long frame unwinding, 32-bit scope. | |
| __c7xabi_unwind_cpp_pr3 | Unwinding, 24-bit encoding, 16-bit scope. |
__c7xabi_abort_msg() Function:
void __c7xabi_abort_msg(const char *msg)
The function __c7xabi_abort_msg() is generated to print a diagnostic message when a run-time assertion (for example, the C assert macro) fails. It must not return. That is, it must call abort or terminate the program by other means.
__c7xabi_strasg() Function:
void __c7xabi_strasg(int* dst, const int* src, unsigned cnt)
The function __c7xabi_strasg() is generated by the compiler for efficient out-of-line structure or array copy operations. The cnt argument is the size in bytes.