SetDenormAreZeros

Enable or disable the flush-to-zero (FTZ) mode:

HmppResult HMPP_SetDenormAreZeros (int32_t value);

Parameters

Parameter	Description	Value Range	Input/Output
value	0: FTZ is disabled. Non-zero value: FTZ is enabled.	int32_t	Input

Return Value

Success: HMPP_STS_NO_ERR
Failure: An error code is returned.

Error Codes

Error Code	Description
HMPP_STS_NOT_SUPPORT	The current system does not use the AArch64 architecture and does not support this function.

Example

#define LEN 4
void  SetDenormAreZeros_Example()
{
    HmppResult result = HMPP_SetDenormAreZeros(1);
    cout << HMPP_GetStatusString(result) << endl;
    const float a[LEN] = {0.99 * pow(2, -126), 1.0 * pow(2, -126),
                          1.5 * pow(2, -126), 1.5 * pow(2, -126)};
    const float b[LEN] = {0.99 * pow(2, -126), 0.99 * pow(2, -126),
                          1.4 * pow(2, -126), -1.4 * pow(2, -126)};

    for (int32_t i = 0; i < LEN; ++i) {
        cout << a[i] + b[i] << endl;
    }

    result = HMPP_SetDenormAreZeros(0);
    cout << HMPP_GetStatusString(result) << endl;

    for (int32_t i = 0; i < LEN; ++i) {
        cout << a[i] + b[i] << endl;
    }
}

Output:

No Error
0
1.17549e-38
3.40893e-38
0
No Error
2.32748e-38
2.33923e-38
3.40893e-38
1.17549e-39

Parent topic: Basic Functions