diff options
Diffstat (limited to 'sysdeps/libm-ieee754')
| -rw-r--r-- | sysdeps/libm-ieee754/s_log2.c | 7 | ||||
| -rw-r--r-- | sysdeps/libm-ieee754/s_log2f.c | 7 |
2 files changed, 8 insertions, 6 deletions
diff --git a/sysdeps/libm-ieee754/s_log2.c b/sysdeps/libm-ieee754/s_log2.c index 93c20b3db1..7379ce85e7 100644 --- a/sysdeps/libm-ieee754/s_log2.c +++ b/sysdeps/libm-ieee754/s_log2.c @@ -62,6 +62,7 @@ static const double #else static double #endif +ln2 = 0.69314718055994530942, two54 = 1.80143985094819840000e+16, /* 43500000 00000000 */ Lg1 = 6.666666666666735130e-01, /* 3FE55555 55555593 */ Lg2 = 3.999999999940941908e-01, /* 3FD99999 9997FA04 */ @@ -109,7 +110,7 @@ static double zero = 0.0; if((0x000fffff&(2+hx))<3) { /* |f| < 2**-20 */ if(f==zero) return dk; R = f*f*(0.5-0.33333333333333333*f); - return dk-(R-f); + return dk-(R-f)/ln2; } s = f/(2.0+f); z = s*s; @@ -122,9 +123,9 @@ static double zero = 0.0; R = t2+t1; if(i>0) { hfsq=0.5*f*f; - return dk-((hfsq-(s*(hfsq+R)))-f); + return dk-((hfsq-(s*(hfsq+R)))-f)/ln2; } else { - return dk-((s*(f-R))-f); + return dk-((s*(f-R))-f)/ln2; } } diff --git a/sysdeps/libm-ieee754/s_log2f.c b/sysdeps/libm-ieee754/s_log2f.c index da9dfb8324..2377acd36a 100644 --- a/sysdeps/libm-ieee754/s_log2f.c +++ b/sysdeps/libm-ieee754/s_log2f.c @@ -23,6 +23,7 @@ static const float #else static float #endif +ln2 = 0.69314718055994530942, two25 = 3.355443200e+07, /* 0x4c000000 */ Lg1 = 6.6666668653e-01, /* 3F2AAAAB */ Lg2 = 4.0000000596e-01, /* 3ECCCCCD */ @@ -69,7 +70,7 @@ static float zero = 0.0; if((0x007fffff&(15+ix))<16) { /* |f| < 2**-20 */ if(f==zero) return dk; R = f*f*((float)0.5-(float)0.33333333333333333*f); - return dk-(R-f); + return dk-(R-f)/ln2; } s = f/((float)2.0+f); z = s*s; @@ -82,9 +83,9 @@ static float zero = 0.0; R = t2+t1; if(i>0) { hfsq=(float)0.5*f*f; - return dk-((hfsq-(s*(hfsq+R)))-f); + return dk-((hfsq-(s*(hfsq+R)))-f)/ln2; } else { - return dk-((s*(f-R))-f); + return dk-((s*(f-R))-f)/ln2; } } weak_alias (__log2f, log2f) |