__builtin_bcdsetsign

Purpose

Set the sign code of the input parameter in packed decimal format.

This built-in function is valid only when -qarch(-mcpu) is set to utilize the POWER9™ technology and the altivec.h file is included.

vector unsigned char __builtin_bcdsetsign(vector unsigned char, unsigned char);

Returns the packed decimal value of the first parameter combined with the sign code.

The sign code is set according to the following rules:

If the packed decimal value of the first parameter is positive, the following rules apply:
- If the second parameter is 0, the sign code is set to 0xC.
- If the second parameter is 1, the sign code is set to 0xF.
If the packed decimal value of the first parameter is negative, the sign code is set to 0xD.

Notes:

The second parameter can only be 0 or 1.
You can determine whether a packed decimal value is positive or negative according to the following rules:
- Packed decimal values with sign code of 0xA, 0xC, 0xE, or 0xF are interpreted as positive values.
- Packed decimal values with sign code of 0xB or 0xD are interpreted as negative values.