diff options
Diffstat (limited to 'lib/msun/src')
| -rw-r--r-- | lib/msun/src/e_rem_pio2f.c | 48 |
1 files changed, 39 insertions, 9 deletions
diff --git a/lib/msun/src/e_rem_pio2f.c b/lib/msun/src/e_rem_pio2f.c index eaedc48..3d17158 100644 --- a/lib/msun/src/e_rem_pio2f.c +++ b/lib/msun/src/e_rem_pio2f.c @@ -55,6 +55,7 @@ zero = 0.00000000000000000000e+00, /* 0x00000000, 0x00000000 */ half = 5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */ two24 = 1.67772160000000000000e+07, /* 0x41700000, 0x00000000 */ invpio2 = 6.36619772367581382433e-01, /* 0x3FE45F30, 0x6DC9C883 */ +pio2 = 1.57079632679489655700e+00, /* 0x3FF921FB, 0x54442d18 */ pio2_1 = 1.57079632673412561417e+00, /* 0x3FF921FB, 0x54400000 */ pio2_1t = 6.07710050650619224932e-11; /* 0x3DD0B461, 0x1A626331 */ @@ -71,16 +72,45 @@ pio2_1t = 6.07710050650619224932e-11; /* 0x3DD0B461, 0x1A626331 */ /* 33+53 bit pi is good enough for special and medium size cases */ if(ix<0x4016cbe4) { /* |x| < 3pi/4, special case with n=+-1 */ if(hx>0) { - z = x - pio2_1; - y[0] = z - pio2_1t; - y[1] = (z-y[0])-pio2_1t; - return 1; - } else { /* negative x */ - z = x + pio2_1; - y[0] = z + pio2_1t; - y[1] = (z-y[0])+pio2_1t; - return -1; + z = x - pio2; + n = 1; + } else { + z = x + pio2; + n = 3; } + y[0] = z; + y[1] = z - y[0]; + return n; + } + if(ix<0x407b53d1) { /* |x| < 5*pi/4, special case with n=+-2 */ + if(hx>0) + z = x - 2*pio2; + else + z = x + 2*pio2; + y[0] = z; + y[1] = z - y[0]; + return 2; + } + if(ix<0x40afeddf) { /* |x| < 7*pi/4, special case with n=+-3 */ + if(hx>0) { + z = x - 3*pio2; + n = 3; + } else { + z = x + 3*pio2; + n = 1; + } + y[0] = z; + y[1] = z - y[0]; + return n; + } + if(ix<0x40e231d6) { /* |x| < 9*pi/4, special case with n=+-4 */ + if(hx>0) + z = x - 4*pio2; + else + z = x + 4*pio2; + y[0] = z; + y[1] = z - y[0]; + return 0; } if(ix<=0x49490f80) { /* |x| ~<= 2^19*(pi/2), medium size */ t = fabsf(x); |
