LDC 1.5.0-beta1

[Nicholas Wilson]

On Monday, 23 October 2017 at 21:26:46 UTC, Guillaume Piolat 
wrote:
> Some measurements for some audio processing. Output are 
> identical across compilers (30 measures).
>
>
> ### LDC 1.2.0
>
> Results:
>  * minimum time: 440 ms => 48.024 x real-time
>  * median  time: 443 ms => 47.6987 x real-time
>  * average time: 444.233 ms => 47.5663 x real-time
>
> ### LDC 1.3.0
>
> Results:
>  * minimum time: 439 ms => 48.1334 x real-time
>  * median  time: 442 ms => 47.8067 x real-time
>  * average time: 442.6 ms => 47.7419 x real-time
>
> ### LDC 1.4.0
>
> Results:
>  * minimum time: 436 ms => 48.4646 x real-time
>  * median  time: 439 ms => 48.1334 x real-time
>  * average time: 439.767 ms => 48.0494 x real-time
>
>
> ### LDC 1.5.0-b1
>
> Results:
>  * minimum time: 429 ms => 49.2553 x real-time
>  * median  time: 432 ms => 48.9133 x real-time
>  * average time: 433.3 ms => 48.7665 x real-time
>
>
> Results are only precise up to the ~0.5% range.
>
> So approx. +2.5% relative improvement in LDC 1.5.0-b1 vs LDC 
> 1.2, free lunch is always good.
>
> The number of flags in -help-hidden seems very large, I haven't 
> tried any yet (apart from -enable-unsafe-fp-math which seems to 
> lose speed like -ffast-math, for this benchmark).

would it help to have them grouped/filterable by category?
e.g.
$ldc2 -help-hidden=category
common
sanitiser
asan
tsan
cache
disable
enable
debug
optimisation
compiler-diaganostics
...

$ldc2 -help-hidden=asan
-asan-always-slow-path
...