[libc-commits] [libc] [libc][math] Fix double-rounding errors with denormal inputs for hypot function. (PR #208247)

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zimmermann6 wrote:

> * hypot(0, qNaN): this seems to be raised somewhere inside check_worst.c,
>  because when I explicitly clear and retest the invalid except, the
>  FE_INVALID is not raised. Can you double check it?

I have fixed the CORE-MATH test suite and now I get no failure any more
with LLVM libc:

***@***.***:~/svn/core-math$ EXTRA_CFLAGS=-DCORE_MATH_UNDERFLOW_BEFORE CORE_MATH_CHECK_STD=true LIBM=$L ./check.sh hypot
Running worst cases check in --rndn mode...
216432 tests passed, 0 failure(s)
Running worst cases check in --rndz mode...
216432 tests passed, 0 failure(s)
Running worst cases check in --rndu mode...
216432 tests passed, 0 failure(s)
Running worst cases check in --rndd mode...
216432 tests passed, 0 failure(s)

Paul



https://github.com/llvm/llvm-project/pull/208247