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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2018-04-29 18:15:16 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2018-04-29 18:15:16 -0400 |
| commit | 9e4caa2748f469d3f37a68f5012a2993dad0db10 (patch) | |
| tree | 7da351d7a078af41e32930489041e1590dfcc594 /src/tutorial/complex.c | |
| parent | eaed0d2305f294b8e6656930d1a22e22911d3ced (diff) | |
Avoid wrong results for power() with NaN input on more platforms.
Buildfarm results show that the modern POSIX rule that 1 ^ NaN = 1 is not
honored on *BSD until relatively recently, and really old platforms don't
believe that NaN ^ 0 = 1 either. (This is unsurprising, perhaps, since
SUSv2 doesn't require either behavior.) In hopes of getting to platform
independent behavior, let's deal with all the NaN-input cases explicitly
in dpow().
Note that numeric_power() doesn't know either of these special cases.
But since that behavior is platform-independent, I think it should be
addressed separately, and probably not back-patched.
Discussion: https://postgr.es/m/75DB81BEEA95B445AE6D576A0A5C9E936A73E741@BPXM05GP.gisp.nec.co.jp
Diffstat (limited to 'src/tutorial/complex.c')
0 files changed, 0 insertions, 0 deletions