Developer Guide and Reference

Contents

ffp-contract

Controls when the compiler is permitted to form fused floating-point operations, such as fused multiply-add (FMA). Fused operations are allowed to produce more precise results than performing the individual operations separately.

Syntax

Linux:
-ffp-contract
=
keyword
Windows:
None
Arguments
keyword
Possible values are:
fast
Fuses floating-point operations across statements.
on
Fuses floating-point operations within the same statement.
off
Does not fuse floating-point operations.
Default
-ffp-contract=fast
Fuses floating-point operations across statements.
However, if option
-fp-model=strict
is specified, the default is
-ffp-contract=off
.
Description
This option controls when the compiler is permitted to form fused floating-point operations, such as fused multiply-add (FMA). Fused operations are allowed to produce more precise results than performing the individual operations separately.
IDE Equivalent
None
Alternate Options
None

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.