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| author | Jeff Johnston <jjohnstn@redhat.com> | 2007-05-01 18:42:15 +0000 |
|---|---|---|
| committer | Jeff Johnston <jjohnstn@redhat.com> | 2007-05-01 18:42:15 +0000 |
| commit | 2babeb3d94cb8a507ca12b46252995b453600290 (patch) | |
| tree | 3e16553171a63e889183bdc36ac4588bd1b3e2e5 /newlib/libm/math/e_pow.c | |
| parent | bb57ddfeb7e766fafb510bce9d1deaa062bb6fd0 (diff) | |
| download | cygnal-2babeb3d94cb8a507ca12b46252995b453600290.tar.gz cygnal-2babeb3d94cb8a507ca12b46252995b453600290.tar.bz2 cygnal-2babeb3d94cb8a507ca12b46252995b453600290.zip | |
2007-05-01 Cary R. <cygcary <at> yahoo.com>
* libm/math/e_pow.c: Fix to be consistent with glibc with regards
to treatment of NaN and +-inf arguments.
* libm/math/ef_pow.c: Ditto.
* libm/math/w_pow.c: Ditto.
* libm/math/wf_pow.c: Ditto.
* libm/math/w_acos.c: Fix domain errors to return NaN.
* libm/math/w_asin.c: Ditto.
* libm/math/wf_acos.c: Ditto.
* libm/math/wf_asin.c: Ditto.
* libm/math/w_log.c: Fix to return NaN for negative number inputs.
* libm/math/wf_log.c: Ditto.
* libm/math/wf_log10.c: Ditto.
* libm/math/w_log10.c: Ditto.
Diffstat (limited to 'newlib/libm/math/e_pow.c')
| -rw-r--r-- | newlib/libm/math/e_pow.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/newlib/libm/math/e_pow.c b/newlib/libm/math/e_pow.c index 56c7980ef..aac0b4211 100644 --- a/newlib/libm/math/e_pow.c +++ b/newlib/libm/math/e_pow.c @@ -25,13 +25,14 @@ * Special cases: * 1. (anything) ** 0 is 1 * 2. (anything) ** 1 is itself - * 3. (anything) ** NAN is NAN + * 3a. (anything) ** NAN is NAN except + * 3b. +1 ** NAN is 1 * 4. NAN ** (anything except 0) is NAN * 5. +-(|x| > 1) ** +INF is +INF * 6. +-(|x| > 1) ** -INF is +0 * 7. +-(|x| < 1) ** +INF is +0 * 8. +-(|x| < 1) ** -INF is +INF - * 9. +-1 ** +-INF is NAN + * 9. +-1 ** +-INF is 1 * 10. +0 ** (+anything except 0, NAN) is +0 * 11. -0 ** (+anything except 0, NAN, odd integer) is +0 * 12. +0 ** (-anything except 0, NAN) is +INF @@ -117,10 +118,11 @@ ivln2_l = 1.92596299112661746887e-08; /* 0x3E54AE0B, 0xF85DDF44 =1/ln2 tail*/ /* y==zero: x**0 = 1 */ if((iy|ly)==0) return one; - /* +-NaN return x+y */ + /* x|y==NaN return NaN unless x==1 then return 1 */ if(ix > 0x7ff00000 || ((ix==0x7ff00000)&&(lx!=0)) || iy > 0x7ff00000 || ((iy==0x7ff00000)&&(ly!=0))) - return x+y; + if(((ix-0x3ff00000)|lx)==0) return one; + else return nan(""); /* determine if y is an odd int when x < 0 * yisint = 0 ... y is not an integer @@ -146,7 +148,7 @@ ivln2_l = 1.92596299112661746887e-08; /* 0x3E54AE0B, 0xF85DDF44 =1/ln2 tail*/ if(ly==0) { if (iy==0x7ff00000) { /* y is +-inf */ if(((ix-0x3ff00000)|lx)==0) - return y - y; /* inf**+-1 is NaN */ + return one; /* +-1**+-inf = 1 */ else if (ix >= 0x3ff00000)/* (|x|>1)**+-inf = inf,0 */ return (hy>=0)? y: zero; else /* (|x|<1)**-,+inf = inf,0 */ |