FP_CONTRACT, FP_FAST_FMAF, FP_FAST_FMA_HALF
FP_CONTRACT, FP_FAST_FMAF, FP_FAST_FMA_HALF
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FP_CONTRACT, FP_FAST_FMAF, FP_FAST_FMA_HALF Control expression contraction; fast fma()

    #pragma OPENCL FP_CONTRACT on-off-switch

    on-off-switch is one of:
         ON, OFF or DEFAULT.
         The DEFAULT value is ON.

    FP_FAST_FMAF
    FP_FAST_FMA
    FP_FAST_FMA_HALF

## FP_CONTRACT

The `FP_CONTRACT` pragma takes the form:

#pragma OPENCL FP_CONTRACT on-off-switch

`FP_CONTRACT` can be used to allow (if the state is `on`) or disallow (if the state is `off`) the implementation to contract expressions. Each pragma can occur either outside external declarations or preceding all explicit declarations and statements inside a compound statement.

The parameter `on-off-switch` is one of ON, OFF or DEFAULT. The DEFAULT value is ON.

When outside external declarations, the pragma takes effect from its occurrence until another `FP_CONTRACT` pragma is encountered, or until the end of the translation unit. When inside a compound statement, the pragma takes effect from its occurrence until another `FP_CONTRACT` pragma is encountered (including within a nested compound statement), or until the end of the compound statement; at the end of a compound statement the state for the pragma is restored to its condition just before the compound statement. If this pragma is used in any other context, the behavior is undefined.

## FP_FAST_FMAF and FP_FAST_FMA

The `FP_FAST_FMAF` macro indicates whether the fma function is fast compared with direct code for single precision floating-point. If defined, the `FP_FAST_FMAF` macro shall indicate that the fma() function generally executes about as fast as, or faster than, a multiply and an add of float operands.

The `FP_FAST_FMA` macro indicates whether the fma family of functions are fast compared with direct code for double precision floating-point. If defined, the `FP_FAST_FMA` macro shall indicate that the fma() function generally executes about as fast as, or faster than, a multiply and an add of double operands.

The `FP_FAST_FMA_HALF` macro indicates whether the fma() family of functions are fast compared with direct code for half precision floating-point. If defined, the `FP_FAST_FMA_HALF` macro shall indicate that the fma() function generally executes about as fast as, or faster than, a multiply and an add of half operands

## Specification

OpenCL Specification

## Also see

Math Functions, Symbolic Math Constants, Macros and Limits

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