fma â perform a fused multiply-add operation
genType fma(genType a, genType b, genType c);
genDType fma( | genDType  | a, |
|  | genDType  | b, |
|  | genDType  | 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.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.
+
| Function | Version 1.10 | Version 1.20 | Version 1.30 | Version 1.40 | Version 1.50 | Version 3.30 | Version 4.00 | Version 4.10 | Version 4.20 | Version 4.30 |
|---|---|---|---|---|---|---|---|---|---|---|
| fma (genType) | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y |
| fma (genDType) | - | - | - | - | - | - | Y | Y | Y | Y |
+ Copyright © 2011 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. + http://opencontent.org/openpub/. +