As of the patch which introduced the new exp implementations:

I am seeing a test failure in the erfc test in libc-test on at least x86-64 (erfc calls exp internally):

src/math/special/erfc.h:6: RN erfc(0x1.5db559fe5c0bap+0) want 0x1.b53cf571d328fp-5 got 0x1.b53cf571d328cp-5 ulperr -2.609 = -0x1.8p+1 + 0x1.900982p-2

Please let me know if there's any other information which would be useful.

Dan