Operator overloading leads to bad code optimization

[Ola Fosheim Grøstad]

On Monday, 6 December 2021 at 00:41:06 UTC, max haughton wrote:
> These kinds of wacky phase ordering (I assume) issues is why I 
> am slightly distrustful of GDC post-inlining decision.

Multiplying with 0.5 only affects the exponent, but the add could 
overflow/underflow. Maybe that is wacky for D since it specifies 
IEEE compliance, but in the gcc-family -O# is really a shortcut 
for a set of options. If I specify -O or -O3 I would expect the 
same options as gcc. Otherwise people will claim that C++ is 
faster?