[Bug math/16315] Bad overflowing pow results for directed rounding

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=16315

--- Comment #1 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Similar issues apply for x86_64 powl as well, including cases where the error
is in the other direction, e.g.:

Failure: Test: pow_downward (-0x2p+0, 0x1.fffffffffffffp+52)
Result:
 is:         -1.18973149535723176503e+4932  -0xf.fffffffffffffff00000p+16380
 should be:  -inf  -inf

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