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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 │
├───────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
│Function │ 1.10 │ 1.20 │ 1.30 │ 1.40 │ 1.50 │ 3.30 │ 4.00 │ 4.10 │ 4.20 │ 4.30 │ 4.40 │ 4.50 │
│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] 07/22/2015 FMA(3G)