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NAME

       fma - perform a fused multiply-add operation

DECLARATION

       genType fma(genType a, genType b, genType c);

       genDType fma(genDType a, genDType b, genDType c);

PARAMETERS

       a
           Specifies the first multiplicand.

       b
           Specifies the second multiplicand.

       c
           Specifies the value to be added to the result.

DESCRIPTION

       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.

VERSION SUPPORT

       ┌───────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │           │        OpenGL Shading Language Version                                            │
       ├───────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │Function1.101.201.301.401.503.304.004.104.204.304.404.50 │
       │Name       │      │      │      │      │      │      │      │      │      │      │      │      │
       ├───────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │fma        │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       │(genType)  │      │      │      │      │      │      │      │      │      │      │      │      │
       ├───────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │fma        │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       │(genDType) │      │      │      │      │      │      │      │      │      │      │      │      │
       └───────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘

COPYRIGHT

       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.
       http://opencontent.org/openpub/.

COPYRIGHT

       Copyright © 2011-2014 Khronos Group

[FIXME: source]                             01/03/2018                                    FMA(3G)