fma, Qfma
Determines whether the compiler
generates fused multiply-add (FMA) instructions if such instructions exist on
the target processor.
Syntax
Linux:
-fma
-no-fma
Windows:
/Qfma
/Qfma-
Arguments
None
Default
- -fmaor/Qfma
- If the instructions exist on the target processor, the compiler generates fused multiply-add (FMA) instructions.However, if you specify-fp-model strict(Linux*)or, but do not explicitly specify/fp:strict(Windows*)-fmaor, the default is/Qfma-no-fmaor./Qfma-
Description
This option determines whether the compiler generates fused multiply-add
(FMA) instructions if such instructions exist on the target processor. When the
[Q]fma
option is specified, the compiler may generate FMA
instructions for combining multiply and add operations. When the negative form
of the
[Q]fma
option is specified, the compiler must generate
separate multiply and add instructions with intermediate rounding.
This option has no effect unless setting CORE-AVX2 or higher is specified
for option [Q]x,
-march
(Linux),
or
/arch
(Windows).
IDE Equivalent
None