On Tuesday, 23 May 2017 at 08:18:26 UTC, Iain Buclaw wrote:
If you want a hint (though it's not my place to say), LLVM I'm told is a reasonably OK compiler, and any reasonably OK compiler should come with overflow intrinsics - try using them directly.

The intrinsics are exposed by LDC's druntime, they just need to be made use of:
https://github.com/ldc-developers/druntime/blob/ldc/src/ldc/intrinsics.di#L446-L468

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