diff options
Diffstat (limited to 'lib/msun/src/e_exp.c')
| -rw-r--r-- | lib/msun/src/e_exp.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/lib/msun/src/e_exp.c b/lib/msun/src/e_exp.c index 60b8b2a..0809c66 100644 --- a/lib/msun/src/e_exp.c +++ b/lib/msun/src/e_exp.c @@ -102,7 +102,7 @@ P5 = 4.13813679705723846039e-08; /* 0x3E663769, 0x72BEA4D0 */ double __ieee754_exp(double x) /* default IEEE double exp */ { - double y,hi=0.0,lo=0.0,c,t; + double y,hi=0.0,lo=0.0,c,t,twopk; int32_t k=0,xsb; u_int32_t hx; @@ -142,18 +142,17 @@ __ieee754_exp(double x) /* default IEEE double exp */ /* x is now in primary range */ t = x*x; + if(k >= -1021) + INSERT_WORDS(twopk,0x3ff00000+(k<<20), 0); + else + INSERT_WORDS(twopk,0x3ff00000+((k+1000)<<20), 0); c = x - t*(P1+t*(P2+t*(P3+t*(P4+t*P5)))); if(k==0) return one-((x*c)/(c-2.0)-x); else y = one-((lo-(x*c)/(2.0-c))-hi); if(k >= -1021) { - u_int32_t hy; - GET_HIGH_WORD(hy,y); - SET_HIGH_WORD(y,hy+(k<<20)); /* add k to y's exponent */ - return y; + if (k==1024) return y*2.0*0x1p1023; + return y*twopk; } else { - u_int32_t hy; - GET_HIGH_WORD(hy,y); - SET_HIGH_WORD(y,hy+((k+1000)<<20)); /* add k to y's exponent */ - return y*twom1000; + return y*twopk*twom1000; } } |
