On Monday, 14 October 2013 at 19:24:27 UTC, Spacen Jasset wrote:
Hello,
Whilst porting some C++ code I have discovered that the
compiled output from the gdc compiler seems to be 47% quicker
than the dmd compiler.
Here is a few more data points for microbenchmarks of simple
functions
On Monday, 14 October 2013 at 19:24:27 UTC, Spacen Jasset wrote:
gdc 4.6 (0.29.1-4.6.4-1ubuntu4) Which I assume might be v2.020?
with flags: [-O2]
That's a really old gdc. If you can, upgrade to ubuntu 13.10 and
you'll get a more up-to-date version. Alternatively, build from
source:
On 14/10/2013 22:06, bearophile wrote:
Spacen Jasset:
const float pi = 3.14159265f;
float dx = cast(float)(Clock.currSystemTick.length %
(TickDuration.ticksPerSec * 10)) / (TickDuration.ticksPerSec * 10);
float xRot = sin(dx * pi * 2) * 0.4f + pi / 2;
float yRot = cos(dx * pi
On 14/10/2013 22:22, Walter Bright wrote:
On 10/14/2013 12:24 PM, Spacen Jasset wrote:
dmd32 v2.063.2
with flags: [-O, -release, -noboundscheck, -inline]
gdc 4.6 (0.29.1-4.6.4-1ubuntu4) Which I assume might be v2.020?
with flags: [-O2]
dmd uses the x87 for 32 bit code for floating point,
Hello,
Whilst porting some C++ code I have discovered that the compiled output
from the gdc compiler seems to be 47% quicker than the dmd compiler. The
code I believe that is the 'busy' code is below. Although I could
provide a complete test if anyone is interested. Is this an expected
Although I could provide a complete test if anyone is
interested. Is this an expected result and/or is there
something I could change to make the compilers perform
similarly.
Maybe you could do something to make the code compiled with DMD
perform better, but it is not unusual for GDC to
Spacen Jasset:
const float pi = 3.14159265f;
float dx = cast(float)(Clock.currSystemTick.length %
(TickDuration.ticksPerSec * 10)) / (TickDuration.ticksPerSec *
10);
float xRot = sin(dx * pi * 2) * 0.4f + pi / 2;
float yRot = cos(dx * pi * 2) * 0.4f;
float yCos =
On 10/14/2013 12:24 PM, Spacen Jasset wrote:
dmd32 v2.063.2
with flags: [-O, -release, -noboundscheck, -inline]
gdc 4.6 (0.29.1-4.6.4-1ubuntu4) Which I assume might be v2.020?
with flags: [-O2]
dmd uses the x87 for 32 bit code for floating point, while gdc uses the SIMD
instructions, which
