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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, FP_FAST_FMA, and FP_FAST_FMA_HALF
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
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