Functions providing elementary mathematical functionality.
The scalar unit on the AIE has support for several fixed-point/integer and/or floating-point non-linear functions. Current support includes Sin/Cos, Inv, InvSqrt and Sqrt functions.
This floating point intrinsics can generate exceptions, for more information you can go here.
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| float | _expf (float x) |
| | Exponent.
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| |
| float | _logf (float x) |
| | Logarithm.
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| |
| float | _sqrtf (float a) |
| | Square Root.
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| |
| float | inv (float a) |
| | Inverse.
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| int | inv (int a, int sft1, int sft2) |
| | Inverse.
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| float | invsqrt (float a) |
| | Inverse Square Root.
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| int | invsqrt (int a, int sft1, int sft2) |
| | Inverse Square Root.
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| cint16 | sincos (unsigned int) |
| | Sine and Cosine.
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| int | sqrt (int a, int sft1, int sft2) |
| | Square Root.
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| |
◆ _expf()
Exponent.
- Parameters
-
| a | Single precision floating-point input value |
- Returns
- Single precision floating point inverse square root
◆ _logf()
Logarithm.
- Parameters
-
| a | Single precision floating-point input value |
- Returns
- Single precision floating point inverse square root
◆ _sqrtf()
Square Root.
- Parameters
-
| a | Single precision floating-point input value |
- Returns
- Single precision floating-point result
◆ inv() [1/2]
Inverse.
- Parameters
-
| a | Single precision floating-point input value |
- Returns
- Single precision floating point inverse
◆ inv() [2/2]
| int inv |
( |
int |
a, |
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|
int |
sft1, |
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|
int |
sft2 |
|
) |
| |
Inverse.
Equivalent to float2fix(inv(fix2float(a,sft1)),sft2).
- Parameters
-
| a | Fixed-point input value |
| sft1 | Decimal point of input value |
| sft2 | Decimal point of output value |
- Returns
- Fixed-point result
◆ invsqrt() [1/2]
Inverse Square Root.
- Parameters
-
| a | Single precision floating-point input value |
- Returns
- Single precision floating point inverse square root
◆ invsqrt() [2/2]
| int invsqrt |
( |
int |
a, |
|
|
int |
sft1, |
|
|
int |
sft2 |
|
) |
| |
Inverse Square Root.
Equivalent to float2fix(invsqrt(fix2float(a,sft1)),sft2).
- Parameters
-
| a | Fixed-point input value |
| sft1 | Decimal point of input value |
| sft2 | Decimal point of output value |
- Returns
- Fixed-point result
◆ sincos()
| cint16 sincos |
( |
unsigned int |
| ) |
|
Sine and Cosine.
- Parameters
-
| a | Fixed-point unsigned input value in Q1.31 format scaled with 1/Pi (input value 2^31 corresponds to Pi). Only the upper 20-bit of the input value are used. |
- Returns
- 32-bit integer concatenating Sine (bits [31:16]) and Cosine (bits [15:0]) in signed Q.15 fixed-point format
◆ sqrt()
| int sqrt |
( |
int |
a, |
|
|
int |
sft1, |
|
|
int |
sft2 |
|
) |
| |
Square Root.
Equivalent to float2fix(sqrt(fix2float(a,sft1)),sft2).
- Parameters
-
| a | Fixed-point input value |
| sft1 | Decimal point of input value |
| sft2 | Decimal point of output value |
- Returns
- Fixed-point result
