[flang-commits] [flang] [flang] optimize `tand` precision (PR #155629)

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c8ef wrote:

> We support f128 if either libquadmath is available or if libm defines macros indicating that it supports f128: `LDBL_MANT_DIG == 113`. See #106957

Thanks for the pointer, I'll look into it later. On my Ubuntu 22.04 development box, the glibc version is 2.35. My thought is to have f128 usable by default on both x86_64 and aarch64, but on x86, it's currently unsupported by default.

https://github.com/llvm/llvm-project/pull/155629