[libc-commits] [libc] [libc][math][c23] Fix impl and tests for X86_80 canonicalize function. (PR #87103)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

Cool, this PR LGTM from the aspect of reverts + individual fixes on top. Remember to squash when merging (only merge 1 commit).  I'll leave the review of the updates to @lntue .

https://github.com/llvm/llvm-project/pull/87103