scanon added inline comments.
================
Comment at: include/math.h:1582
+ const _RealT __trunc_r = __builtin_trunc(__r);
+ if (__trunc_r >= ::nextafter(static_cast<_RealT>(_MaxVal), INFINITY)) {
+ return _Lim::max();
----------------
EricWF wrote:
> scanon wrote:
> > zoecarver wrote:
> > > Maybe change `INFINITY` to `std::numeric_limits< _RealT >::infinity()`
> > Why isn't this just `__trunc_r > _MaxVal`?
> Consider `long long` and `double`. `MaxVal - numeric_limits<long long>::max()
> == 1024`, and we want values between `MaxVal` and `::max()` to round down. So
> instead we essentially check for `__r >= numeric_limits<long long>::max() +
> 1`. This approach seems more accurate.
> Consider long long and double. MaxVal - numeric_limits<long long>::max() ==
> 1024, and we want values between MaxVal and ::max() to round down. So instead
> we essentially check for __r >= numeric_limits<long long>::max() + 1
Yes, but there are no values between MaxVal and ::max() in the floating-point
format; if there were, they would be MaxVal instead. So you can ditch the
nextafter and just use `> static_cast<_FloatT>(MaxVal)`.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D66836/new/
https://reviews.llvm.org/D66836
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
