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2007-06-04 Jakub Jelinek <jakub@redhat.com>

Browse Source 
* 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 2007-07-12 15:29:06 +00:00
parent 5b4675550e
commit 5dbbefb6b5
3 changed files with 93 additions and 54 deletions
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15
ChangeLog
View File

@ -1,3 +1,18 @@
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.
2007-05-29 Ulrich Drepper <drepper@redhat.com>
* nscd/nscd_helper.c (get_mapping): Handle short replies instead

35
sysdeps/ieee754/ldbl-128ibm/s_fpclassifyl.c
View File

@ -30,14 +30,16 @@
* -NaN fffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
* +Inf 7ff0 0000 0000 0000 xxxx xxxx xxxx xxxx
* -Inf fff0 0000 0000 0000 xxxx xxxx xxxx xxxx
* +0 0000 0000 0000 0000
* -0 8000 0000 0000 0000
* +normal 001n nnnn nnnn nnnn (smallest)
* -normal 801n nnnn nnnn nnnn (smallest)
* +normal 7fen nnnn nnnn nnnn (largest)
* -normal ffen nnnn nnnn nnnn (largest)
* +denorm 000n nnnn nnnn nnnn
* -denorm 800n nnnn nnnn nnnn
* +0 0000 0000 0000 0000 xxxx xxxx xxxx xxxx
* -0 8000 0000 0000 0000 xxxx xxxx xxxx xxxx
* +normal 0360 0000 0000 0000 0000 0000 0000 0000 (smallest)
* -normal 8360 0000 0000 0000 0000 0000 0000 0000 (smallest)
* +normal 7fef ffff ffff ffff 7c8f ffff ffff fffe (largest)
* +normal ffef ffff ffff ffff fc8f ffff ffff fffe (largest)
* +denorm 0360 0000 0000 0000 8000 0000 0000 0001 (largest)
* -denorm 8360 0000 0000 0000 0000 0000 0000 0001 (largest)
* +denorm 000n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
* -denorm 800n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
*/
int
@ -59,12 +61,23 @@ ___fpclassifyl (long double x)
/* +/-zero or +/- normal or +/- denormal */
if (hx & 0x7fffffffffffffffULL) {
/* +/- normal or +/- denormal */
if ((hx & 0x7ff0000000000000ULL) >= 0x0360000000000000ULL) {
if ((hx & 0x7ff0000000000000ULL) > 0x0360000000000000ULL) {
/* +/- normal */
retval = FP_NORMAL;
} else {
/* +/- denormal */
retval = FP_SUBNORMAL;
if ((hx & 0x7ff0000000000000ULL) == 0x0360000000000000ULL) {
if ((lx & 0x7fffffffffffffff) /* lower is non-zero */
&& ((lx^hx) & 0x8000000000000000ULL)) { /* and sign differs */
/* +/- denormal */
retval = FP_SUBNORMAL;
} else {
/* +/- normal */
retval = FP_NORMAL;
}
} else {
/* +/- denormal */
retval = FP_SUBNORMAL;
}
}
} else {
/* +/- zero */

97
sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c
View File

@ -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);