diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/e_powl.c | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/sysdeps/ieee754/ldbl-128/e_powl.c b/sysdeps/ieee754/ldbl-128/e_powl.c index d131750718..f531385232 100644 --- a/sysdeps/ieee754/ldbl-128/e_powl.c +++ b/sysdeps/ieee754/ldbl-128/e_powl.c @@ -148,7 +148,7 @@ long double __ieee754_powl (long double x, long double y) { long double z, ax, z_h, z_l, p_h, p_l; - long double y1, t1, t2, r, s, t, u, v, w; + long double y1, t1, t2, r, s, sgn, t, u, v, w; long double s2, s_h, s_l, t_h, t_l, ay; int32_t i, j, k, yisint, n; u_int32_t ix, iy; @@ -262,6 +262,11 @@ __ieee754_powl (long double x, long double y) if (((((u_int32_t) hx >> 31) - 1) | yisint) == 0) return (x - x) / (x - x); + /* sgn (sign of result -ve**odd) = -1 else = 1 */ + sgn = one; + if (((((u_int32_t) hx >> 31) - 1) | (yisint - 1)) == 0) + sgn = -one; /* (-ve)**(odd int) */ + /* |y| is huge. 2^-16495 = 1/2 of smallest representable value. If (1 - 1/131072)^y underflows, y > 1.4986e9 */ @@ -277,9 +282,9 @@ __ieee754_powl (long double x, long double y) } /* over/underflow if x is not close to one */ if (ix < 0x3ffeffff) - return (hy < 0) ? huge * huge : tiny * tiny; + return (hy < 0) ? sgn * huge * huge : sgn * tiny * tiny; if (ix > 0x3fff0000) - return (hy > 0) ? huge * huge : tiny * tiny; + return (hy > 0) ? sgn * huge * huge : sgn * tiny * tiny; } ay = y > 0 ? y : -y; @@ -366,11 +371,6 @@ __ieee754_powl (long double x, long double y) t1 = o.value; t2 = z_l - (((t1 - t) - dp_h[k]) - z_h); - /* s (sign of result -ve**odd) = -1 else = 1 */ - s = one; - if (((((u_int32_t) hx >> 31) - 1) | (yisint - 1)) == 0) - s = -one; /* (-ve)**(odd int) */ - /* split up y into y1+y2 and compute (y1+y2)*(t1+t2) */ y1 = y; o.value = y1; @@ -386,11 +386,11 @@ __ieee754_powl (long double x, long double y) { /* if z > 16384 */ if (((j - 0x400d0000) | o.parts32.w1 | o.parts32.w2 | o.parts32.w3) != 0) - return s * huge * huge; /* overflow */ + return sgn * huge * huge; /* overflow */ else { if (p_l + ovt > z - p_h) - return s * huge * huge; /* overflow */ + return sgn * huge * huge; /* overflow */ } } else if ((j & 0x7fffffff) >= 0x400d01b9) /* z <= -16495 */ @@ -398,11 +398,11 @@ __ieee754_powl (long double x, long double y) /* z < -16495 */ if (((j - 0xc00d01bc) | o.parts32.w1 | o.parts32.w2 | o.parts32.w3) != 0) - return s * tiny * tiny; /* underflow */ + return sgn * tiny * tiny; /* underflow */ else { if (p_l <= z - p_h) - return s * tiny * tiny; /* underflow */ + return sgn * tiny * tiny; /* underflow */ } } /* compute 2**(p_h+p_l) */ @@ -441,6 +441,6 @@ __ieee754_powl (long double x, long double y) o.parts32.w0 = j; z = o.value; } - return s * z; + return sgn * z; } strong_alias (__ieee754_powl, __powl_finite) |