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2007-06-04 Jakub Jelinek <jakub@redhat.com>
* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (nextafterl): Remove unused ily variable. Fix nextafterl on +-__LDBL_MAX__ and +-Inf. Remove unreachable code at the end. 2007-06-01 Steven Munroe <sjmunroe@us.ibm.com> * sysdeps/ieee754/ldbl-128ibm/s_fpclassifyl.c: Correct description of ldbl-128ibm in comment. (fpclassifyl): Correct classification of denormals. * sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (nextafterl): Correct return value for MIN denormal. Rewrite using long double math too correctly handle denormals and canonicalize the results.
This commit is contained in:
Jakub Jelinek
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5b4675550e
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5dbbefb6b5
15
ChangeLog
15
ChangeLog
@ -1,3 +1,18 @@
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2007-06-04 Jakub Jelinek <jakub@redhat.com>
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* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (nextafterl): Remove
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unused ily variable. Fix nextafterl on +-__LDBL_MAX__ and +-Inf.
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Remove unreachable code at the end.
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2007-06-01 Steven Munroe <sjmunroe@us.ibm.com>
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* sysdeps/ieee754/ldbl-128ibm/s_fpclassifyl.c: Correct description of
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ldbl-128ibm in comment.
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(fpclassifyl): Correct classification of denormals.
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* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (nextafterl): Correct
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return value for MIN denormal. Rewrite using long double math too
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correctly handle denormals and canonicalize the results.
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2007-05-29 Ulrich Drepper <drepper@redhat.com>
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* nscd/nscd_helper.c (get_mapping): Handle short replies instead
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@ -30,14 +30,16 @@
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* -NaN fffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
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* +Inf 7ff0 0000 0000 0000 xxxx xxxx xxxx xxxx
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* -Inf fff0 0000 0000 0000 xxxx xxxx xxxx xxxx
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* +0 0000 0000 0000 0000
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* -0 8000 0000 0000 0000
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* +normal 001n nnnn nnnn nnnn (smallest)
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* -normal 801n nnnn nnnn nnnn (smallest)
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* +normal 7fen nnnn nnnn nnnn (largest)
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* -normal ffen nnnn nnnn nnnn (largest)
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* +denorm 000n nnnn nnnn nnnn
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* -denorm 800n nnnn nnnn nnnn
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* +0 0000 0000 0000 0000 xxxx xxxx xxxx xxxx
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* -0 8000 0000 0000 0000 xxxx xxxx xxxx xxxx
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* +normal 0360 0000 0000 0000 0000 0000 0000 0000 (smallest)
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* -normal 8360 0000 0000 0000 0000 0000 0000 0000 (smallest)
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* +normal 7fef ffff ffff ffff 7c8f ffff ffff fffe (largest)
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* +normal ffef ffff ffff ffff fc8f ffff ffff fffe (largest)
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* +denorm 0360 0000 0000 0000 8000 0000 0000 0001 (largest)
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* -denorm 8360 0000 0000 0000 0000 0000 0000 0001 (largest)
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* +denorm 000n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
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* -denorm 800n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
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*/
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int
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@ -59,12 +61,23 @@ ___fpclassifyl (long double x)
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/* +/-zero or +/- normal or +/- denormal */
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if (hx & 0x7fffffffffffffffULL) {
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/* +/- normal or +/- denormal */
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if ((hx & 0x7ff0000000000000ULL) >= 0x0360000000000000ULL) {
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if ((hx & 0x7ff0000000000000ULL) > 0x0360000000000000ULL) {
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/* +/- normal */
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retval = FP_NORMAL;
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} else {
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if ((hx & 0x7ff0000000000000ULL) == 0x0360000000000000ULL) {
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if ((lx & 0x7fffffffffffffff) /* lower is non-zero */
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&& ((lx^hx) & 0x8000000000000000ULL)) { /* and sign differs */
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/* +/- denormal */
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retval = FP_SUBNORMAL;
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} else {
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/* +/- normal */
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retval = FP_NORMAL;
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}
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} else {
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/* +/- denormal */
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retval = FP_SUBNORMAL;
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}
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}
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} else {
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/* +/- zero */
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@ -35,7 +35,7 @@ static char rcsid[] = "$NetBSD: $";
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long double x,y;
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#endif
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{
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int64_t hx,hy,ihx,ihy,ilx,ily;
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int64_t hx,hy,ihx,ihy,ilx;
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u_int64_t lx,ly;
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GET_LDOUBLE_WORDS64(hx,lx,x);
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@ -43,7 +43,6 @@ static char rcsid[] = "$NetBSD: $";
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ihx = hx&0x7fffffffffffffffLL; /* |hx| */
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ilx = lx&0x7fffffffffffffffLL; /* |lx| */
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ihy = hy&0x7fffffffffffffffLL; /* |hy| */
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ily = ly&0x7fffffffffffffffLL; /* |ly| */
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if((((ihx&0x7ff0000000000000LL)==0x7ff0000000000000LL)&&
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((ihx&0x000fffffffffffffLL)!=0)) || /* x is nan */
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@ -54,54 +53,66 @@ static char rcsid[] = "$NetBSD: $";
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return y; /* x=y, return y */
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if(ihx == 0 && ilx == 0) { /* x == 0 */
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long double u;
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SET_LDOUBLE_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */
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u = math_opt_barrier (u);
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hy = (hy & 0x8000000000000000ULL) | 1;
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SET_LDOUBLE_WORDS64(x,hy,0ULL);/* return +-minsubnormal */
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u = math_opt_barrier (x);
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u = u * u;
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math_force_eval (u); /* raise underflow flag */
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return x;
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}
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if(ihx>=0) { /* x > 0 */
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if(ihx>ihy||((ihx==ihy)&&(ilx>ily))) { /* x > y, x -= ulp */
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if(ilx==0)
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hx--;
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else
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lx--;
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} else { /* x < y, x += ulp */
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if((hx==0x7fefffffffffffffLL)&&(lx==0x7c8ffffffffffffeLL))
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{
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SET_LDOUBLE_WORDS64(x,0x7ff0000000000000,0x8000000000000000);
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return x;
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long double u;
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if(x > y) { /* x > y, x -= ulp */
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if((hx==0xffefffffffffffffLL)&&(lx==0xfc8ffffffffffffeLL))
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return x+x; /* overflow, return -inf */
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if (hx >= 0x7ff0000000000000LL) {
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SET_LDOUBLE_WORDS64(u,0x7fefffffffffffffLL,0x7c8ffffffffffffeLL);
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return u;
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}
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else if((hx==0xffefffffffffffffLL)&&(lx==0xfc8ffffffffffffeLL))
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{
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SET_LDOUBLE_WORDS64(x,0xfff0000000000000,0x8000000000000000);
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return x;
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}
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else if((lx&0x7fffffffffffffff)==0) hx++;
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else
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lx++;
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}
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} else { /* x < 0 */
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if(ihy>=0||ihx>ihy||((ihx==ihy)&&(ilx>ily))){/* x < y, x -= ulp */
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if((lx&0x7fffffffffffffff)==0)
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hx--;
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else
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lx--;
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} else { /* x > y, x += ulp */
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if((lx&0x7fffffffffffffff)==0) hx++;
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else
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lx++;
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}
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}
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hy = hx&0x7ff0000000000000LL;
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if(hy==0x7ff0000000000000LL) return x+x;/* overflow */
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if(hy==0) {
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long double u = x * x; /* underflow */
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if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */
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u = math_opt_barrier (x);
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x -= __LDBL_DENORM_MIN__;
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if (ihx < 0x0360000000000000LL
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|| (hx > 0 && (int64_t) lx <= 0)
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|| (hx < 0 && (int64_t) lx > 1)) {
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u = u * u;
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math_force_eval (u); /* raise underflow flag */
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}
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SET_LDOUBLE_WORDS64(x,hx,lx);
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return x;
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}
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if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */
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SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL),0ULL);
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u *= 0x1.0000000000000p-105L;
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} else
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SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL)-0x0690000000000000LL,0ULL);
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return x - u;
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} else { /* x < y, x += ulp */
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if((hx==0x7fefffffffffffffLL)&&(lx==0x7c8ffffffffffffeLL))
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return x+x; /* overflow, return +inf */
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if ((u_int64_t) hx >= 0xfff0000000000000ULL) {
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SET_LDOUBLE_WORDS64(u,0xffefffffffffffffLL,0xfc8ffffffffffffeLL);
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return u;
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}
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if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */
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u = math_opt_barrier (x);
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x += __LDBL_DENORM_MIN__;
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if (ihx < 0x0360000000000000LL
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|| (hx > 0 && (int64_t) lx < 0 && lx != 0x8000000000000001LL)
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|| (hx < 0 && (int64_t) lx >= 0)) {
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u = u * u;
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math_force_eval (u); /* raise underflow flag */
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}
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if (x == 0.0L) /* handle negative __LDBL_DENORM_MIN__ case */
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x = -0.0L;
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return x;
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}
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if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */
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SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL),0ULL);
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u *= 0x1.0000000000000p-105L;
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} else
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SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL)-0x0690000000000000LL,0ULL);
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return x + u;
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}
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}
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strong_alias (__nextafterl, __nexttowardl)
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long_double_symbol (libm, __nextafterl, nextafterl);
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