Re: Fix for review

Hi,

On 9/19/25 6:41 PM, tshah wrote:

> 1. The failure also occurs on arm64, which has always used IEEE . This 
> strongly suggests that the issue is not specific to IBM format. Also 
> most probably  the recent transitions are for long double and here btas 
> is using double.

Mh, so it may be passing on x87 FPUs only, which is brittle even on 
x86/x86_64 because it depends on using x87 style FPU instructions and 
keeping intermediates on the FPU stack without spilling them, so 
different compiler options can influence the result.

In that case, a larger epsilon might be correct, but it could also be 
that the expected value is wrong (because it was calculated with an x87 
style FPU), so the proper fix is to fix the expected value to what an 
IEEE conformant implementation outputs, and then maybe extend the 
epsilon for x86.

    Simon