Texas Instruments TMS34010 - Page 98

Appendix 0
Table 0-1. Floating Point Error Descriptions
Error Functions
Code
Generating Error Description
(decimal) the Error
1
-FP-DTOI
Conversion error: Generated if destination format cannot
-FP-DTOU
faithfully represent source value(essentially
2
-FP-DTOF
an overflow occurs when trying to make the conversion
3
-FP-FTOI
from source format to destination format).
-FP-FTOU
4
-FP-ADD
Infinity - infinity: Default result is zero.
5
-FP-ADD
Overflow: Generated when there is an
6 -FP-MUL
overflow during an arithmetic operation (i.e.,
7 -FP-DIV
the result is too big to be represented in the given format).
Default result is + / - infinity.
11
-FP-MUL
Infinity x 0: default result is zero.
12 -FP-ADD Underflow: Generated when there is an underflow
13
-FP_MUL
during an arithmetic operation (Le., the
14
_FP_DIV
result is too small to be represented in the given format). De-
fault result is zero.
15
-FP-DIV
Divide by zero: Default result is + / - infinity.
16
-FP-DIV
Infinity/infinity: Default result is +/-1.
0.5.1 Default Error Exception Handler
The default error exception handler fp-error can be modified to meet your
specific needs. As supplied, the routine is as follows:
void fp-error (error_code)
int error - code;
[
return; /* does nothing */
}
0.6 Function Descriptions
This section contains a description of each of the TMS3401 0 C floating point
RTS (Run-Time Support) functions. Each function is covered in a one-page
summary describing its inputs, outputs, error detection, and argument passing.
Argument passing
is described via a convention indicating arguments as de-
scribed
below. The following notations and conventions are used in the
function summaries:
float
double
int
opcode
single-precision floating-point number (32 bits)
double-precision
floating-point number (64 bits)
integer
(32 bits)
32-bit operation code
0-7