Am 19.01.2014 22:50 schrieb Nikolay Nikolov nick...@users.sourceforge.net
:
On 01/19/2014 10:45 PM, Sven Barth wrote:
Can the compiler optimise this operation choosing the fastest one -
probably depending on the architecture x86, arm, aso.
It can if someone codes support for it (maybe some
On 01/19/2014 09:45 PM, Sven Barth wrote:
Can't really comment on floats, but for integers the fasted to
multiply by 2 should be a shift left.
GCC automatically optimizes this. With the small embedded CPUs I
usually use, it even converts more most multiplications and divisions
with constants
Sven Barth wrote:
Can the compiler optimise this operation choosing the fastest one -
probably depending on the architecture x86, arm, aso.
It can if someone codes support for it (maybe some code generators
already have such simplifications). I thought I've at least seen such
code for
Dear Freepascalers,
The multiplication in floating arthmetic units is usualy know as being slower than the addition. So, have
I interest to code X+X, 2*X or X*2 when using reals (mainly double and extended) ?And with integers ?
Can the compiler optimise this operation choosing the fastest one
forgot
X shl 1
normaly the fastest ...
Em 19.01.2014 17:47,
Ched escreveu:
Dear Freepascalers,
The multiplication in
floating arthmetic units is usualy know as being slower than the
addition. So, have
I interest to code X+X, 2*X or X*2 when using
reals (mainly double and extended)
On 19.01.2014 21:07, Philippe wrote:
forgot
X shl 1
normaly the fastest ...
But only for ints, not floating point values.
Regards,
Sven
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On 19.01.2014 20:47, Ched wrote:
Dear Freepascalers,
The multiplication in floating arthmetic units is usualy know as being
slower than the addition. So, have I interest to code X+X, 2*X or X*2
when using reals (mainly double and extended) ?And with integers ?
Can't really comment on floats,
That is right for positive integers. But for floating point numbers ?
Cheers, Raoul
Le 19 janv. 2014 21:23, Philippe phili...@quarta.com.br a écrit :
forgot
X shl 1
normaly the fastest ...
Em 19.01.2014 17:47, Ched escreveu:
Dear Freepascalers,
The multiplication in floating
On 01/19/2014 10:45 PM, Sven Barth wrote:
On 19.01.2014 20:47, Ched wrote:
Dear Freepascalers,
The multiplication in floating arthmetic units is usualy know as being
slower than the addition. So, have I interest to code X+X, 2*X or X*2
when using reals (mainly double and extended) ?And with
