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| author | wolfbeast <mcwerewolf@wolfbeast.com> | 2019-11-15 13:51:29 +0100 |
|---|---|---|
| committer | wolfbeast <mcwerewolf@wolfbeast.com> | 2019-11-15 13:51:29 +0100 |
| commit | 85c60f94fb584ecab49743ab533e56f0f9981ecc (patch) | |
| tree | ab4d77628de849f137ca9b2d0b543da4d49c63ba /modules/fdlibm | |
| parent | 2057abd196545ddf8c85ab83e7d220367af8b276 (diff) | |
| download | UXP-85c60f94fb584ecab49743ab533e56f0f9981ecc.tar UXP-85c60f94fb584ecab49743ab533e56f0f9981ecc.tar.gz UXP-85c60f94fb584ecab49743ab533e56f0f9981ecc.tar.lz UXP-85c60f94fb584ecab49743ab533e56f0f9981ecc.tar.xz UXP-85c60f94fb584ecab49743ab533e56f0f9981ecc.zip | |
Issue #1291 - Part 1: Ensure exp(1) returns e exactly (use a const)
Diffstat (limited to 'modules/fdlibm')
| -rw-r--r-- | modules/fdlibm/src/e_exp.cpp | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/modules/fdlibm/src/e_exp.cpp b/modules/fdlibm/src/e_exp.cpp index b31979134..c4e530d4d 100644 --- a/modules/fdlibm/src/e_exp.cpp +++ b/modules/fdlibm/src/e_exp.cpp @@ -96,6 +96,8 @@ P3 = 6.61375632143793436117e-05, /* 0x3F11566A, 0xAF25DE2C */ P4 = -1.65339022054652515390e-06, /* 0xBEBBBD41, 0xC5D26BF1 */ P5 = 4.13813679705723846039e-08; /* 0x3E663769, 0x72BEA4D0 */ +static const double E = 2.7182818284590452354; /* e */ + static volatile double huge = 1.0e+300, twom1000= 9.33263618503218878990e-302; /* 2**-1000=0x01700000,0*/ @@ -127,6 +129,7 @@ __ieee754_exp(double x) /* default IEEE double exp */ /* argument reduction */ if(hx > 0x3fd62e42) { /* if |x| > 0.5 ln2 */ if(hx < 0x3FF0A2B2) { /* and |x| < 1.5 ln2 */ + if (x == 1.0) return E; hi = x-ln2HI[xsb]; lo=ln2LO[xsb]; k = 1-xsb-xsb; } else { k = (int)(invln2*x+halF[xsb]); |