diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c | 97 |
1 files changed, 54 insertions, 43 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c b/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c index 4f8aa7d..39d0e6a 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c @@ -35,7 +35,7 @@ static char rcsid[] = "$NetBSD: $"; long double x,y; #endif { - int64_t hx,hy,ihx,ihy,ilx,ily; + int64_t hx,hy,ihx,ihy,ilx; u_int64_t lx,ly; GET_LDOUBLE_WORDS64(hx,lx,x); @@ -43,7 +43,6 @@ static char rcsid[] = "$NetBSD: $"; ihx = hx&0x7fffffffffffffffLL; /* |hx| */ ilx = lx&0x7fffffffffffffffLL; /* |lx| */ ihy = hy&0x7fffffffffffffffLL; /* |hy| */ - ily = ly&0x7fffffffffffffffLL; /* |ly| */ if((((ihx&0x7ff0000000000000LL)==0x7ff0000000000000LL)&& ((ihx&0x000fffffffffffffLL)!=0)) || /* x is nan */ @@ -54,54 +53,66 @@ static char rcsid[] = "$NetBSD: $"; return y; /* x=y, return y */ if(ihx == 0 && ilx == 0) { /* x == 0 */ long double u; - SET_LDOUBLE_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */ - u = math_opt_barrier (u); + hy = (hy & 0x8000000000000000ULL) | 1; + SET_LDOUBLE_WORDS64(x,hy,0ULL);/* return +-minsubnormal */ + u = math_opt_barrier (x); u = u * u; math_force_eval (u); /* raise underflow flag */ return x; } - if(ihx>=0) { /* x > 0 */ - if(ihx>ihy||((ihx==ihy)&&(ilx>ily))) { /* x > y, x -= ulp */ - - if(ilx==0) - hx--; - else - lx--; - } else { /* x < y, x += ulp */ - if((hx==0x7fefffffffffffffLL)&&(lx==0x7c8ffffffffffffeLL)) - { - SET_LDOUBLE_WORDS64(x,0x7ff0000000000000,0x8000000000000000); - return x; - } - else if((hx==0xffefffffffffffffLL)&&(lx==0xfc8ffffffffffffeLL)) - { - SET_LDOUBLE_WORDS64(x,0xfff0000000000000,0x8000000000000000); - return x; - } - else if((lx&0x7fffffffffffffff)==0) hx++; - else - lx++; + + long double u; + if(x > y) { /* x > y, x -= ulp */ + if((hx==0xffefffffffffffffLL)&&(lx==0xfc8ffffffffffffeLL)) + return x+x; /* overflow, return -inf */ + if (hx >= 0x7ff0000000000000LL) { + SET_LDOUBLE_WORDS64(u,0x7fefffffffffffffLL,0x7c8ffffffffffffeLL); + return u; } - } else { /* x < 0 */ - if(ihy>=0||ihx>ihy||((ihx==ihy)&&(ilx>ily))){/* x < y, x -= ulp */ - if((lx&0x7fffffffffffffff)==0) - hx--; - else - lx--; - } else { /* x > y, x += ulp */ - if((lx&0x7fffffffffffffff)==0) hx++; - else - lx++; + if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */ + u = math_opt_barrier (x); + x -= __LDBL_DENORM_MIN__; + if (ihx < 0x0360000000000000LL + || (hx > 0 && (int64_t) lx <= 0) + || (hx < 0 && (int64_t) lx > 1)) { + u = u * u; + math_force_eval (u); /* raise underflow flag */ + } + return x; } + if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */ + SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL),0ULL); + u *= 0x1.0000000000000p-105L; + } else + SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL)-0x0690000000000000LL,0ULL); + return x - u; + } else { /* x < y, x += ulp */ + if((hx==0x7fefffffffffffffLL)&&(lx==0x7c8ffffffffffffeLL)) + return x+x; /* overflow, return +inf */ + if ((u_int64_t) hx >= 0xfff0000000000000ULL) { + SET_LDOUBLE_WORDS64(u,0xffefffffffffffffLL,0xfc8ffffffffffffeLL); + return u; + } + if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */ + u = math_opt_barrier (x); + x += __LDBL_DENORM_MIN__; + if (ihx < 0x0360000000000000LL + || (hx > 0 && (int64_t) lx < 0 && lx != 0x8000000000000001LL) + || (hx < 0 && (int64_t) lx >= 0)) { + u = u * u; + math_force_eval (u); /* raise underflow flag */ + } + if (x == 0.0L) /* handle negative __LDBL_DENORM_MIN__ case */ + x = -0.0L; + return x; + } + if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */ + SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL),0ULL); + u *= 0x1.0000000000000p-105L; + } else + SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL)-0x0690000000000000LL,0ULL); + return x + u; } - hy = hx&0x7ff0000000000000LL; - if(hy==0x7ff0000000000000LL) return x+x;/* overflow */ - if(hy==0) { - long double u = x * x; /* underflow */ - math_force_eval (u); /* raise underflow flag */ - } - SET_LDOUBLE_WORDS64(x,hx,lx); - return x; } strong_alias (__nextafterl, __nexttowardl) long_double_symbol (libm, __nextafterl, nextafterl); |