vec_test_data_class
Purpose
Determines the data class of the elements of the given vector.
This built-in function is valid only when -qarch(-mcpu) is set to utilize the POWER9™ technology and the altivec.h file is included.
Syntax
d=vec_test_data_class(a, b)Result and argument types
The following table describes the types of the returned value and the function arguments.
| d | a | b |
|---|---|---|
| vector bool int | vector float | unsigned char |
| vector bool long long | vector double | unsigned char |
Result value
Returns the results of testing a for the condition selected by b. The value of b is in the range of 0-127. Each bit of b enables the test of a different condition. You can refer to the following table for the mapping relations between testing conditions and bits of b:
| Bits of b | Test conditions |
|---|---|
| 0x01 | Test for -Denormal |
| 0x02 | Test for +Denormal |
| 0x04 | Test for -Zero |
| 0x08 | Test for +Zero |
| 0x10 | Test for -Infinity |
| 0x20 | Test for +Infinity |
| 0x40 | Test for NaN |
If any of the enabled test conditions is true, all of the bits of corresponding element are set to 1. If all of the enabled test conditions are false, all of the bits of the corresponding element is set to 0.
