[PATCH] D24925: [testsuite] turn fp-contract off for ARM because output checking is not flexible enough

[Steve Canon via llvm-commits]

scanon added a comment.

The tests in question are broken.  They blindly apply a relative error tolerance that is not motivated by sound numerical analysis, despite the existence of well-known and well-founded error bounds for these problems, in every basic numerical analysis textbook.

That said, this doesn't actually fix the issue.  It's a band-aid that allows the other patch to proceed.  Since you seem to want to block that change in the short-term, there's probably not much point in proceeding with this one.

If someone has the time to devote to a correct fix for these tests, I can help them with the mathematically-correct error bounds.


https://reviews.llvm.org/D24925