[PATCH] D72685: [PowerPC] Exploit VSX rounding instrs for rint

[Qiu Chaofan via Phabricator via llvm-commits]

qiucf added a comment.

In D72685#1868618 <https://reviews.llvm.org/D72685#1868618>, @lkail wrote:

> Correct me if I'm wrong. `rint(x)` returns `x` if `x` is an NaN. However, intruction like `XSRDPIC` may turn `SNAN` to `QNAN`. Does it matter?


I didn't find the language standard ensuring this (only '//return NaN for NaN//'). It seems Glibc's `rint` would also return a `qNaN` for `sNaN`, while some other implementations keeps it. Is that specified by any doc/spec? Thanks.


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https://reviews.llvm.org/D72685