fma — perform a fused multiply-add operation
genType fma(
|
genType a, |
| genType b, | |
genType c); |
a
Specifies the first multiplicand.
b
Specifies the second multiplicand.
c
Specifies the value to be added to the result.
fma performs, where possible, a fused multiply-add operation,
returning a * b + c.
In use cases where the return value is eventually consumed by a variable declared as
precise:
fma() is considered a single
operation, whereas the expression a * b +
c consumed by a variable declared as
precise is considered two operations.
The precision of fma() can
differ from the precision of the expression a
* b + c.
fma() will be computed with the
same precision as any other
fma() consumed by a
precise variable, giving invariant
results for the same input values of
a, b
and c.
Otherwise, in the absense of precise consumption, there are no
special constraints on the number of operations or difference in precision between
fma() and the expression a * b + c.
| OpenGL ES Shading Language Version | |||
|---|---|---|---|
| Function Name | 1.00 | 3.00 | 3.10 |
fma
|
- | - | ✔ |
Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. https://opencontent.org/openpub/.