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Fix ldbl-128 rintl/nearbyintl just like flt-32 variants.

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* sysdeps/ieee754/ldbl-128/s_nearbyintl.c (__nearbyintl): Do not
	manipulate bits before adding and subtracting TWO112[sx].
	* sysdeps/ieee754/ldbl-128/s_rintl.c (__rintl): Likewise.
This commit is contained in:
David S. Miller
2012-02-27 14:51:45 -08:00
parent 36c8acb4f8
commit a78bc6549c
3 changed files with 12 additions and 44 deletions
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6
ChangeLog
View File

@@ -1,3 +1,9 @@
2012-02-27 David S. Miller <davem@davemloft.net>
* sysdeps/ieee754/ldbl-128/s_nearbyintl.c (__nearbyintl): Do not
manipulate bits before adding and subtracting TWO112[sx].
* sysdeps/ieee754/ldbl-128/s_rintl.c (__rintl): Likewise.
2012-02-27 Roland McGrath <roland@hack.frob.com> 2012-02-27 Roland McGrath <roland@hack.frob.com>
[BZ #13775] [BZ #13775]

25
sysdeps/ieee754/ldbl-128/s_nearbyintl.c
View File

@@ -37,18 +37,13 @@ long double __nearbyintl(long double x)
{ {
fenv_t env; fenv_t env;
int64_t i0,j0,sx; int64_t i0,j0,sx;
u_int64_t i,i1; u_int64_t i1;
long double w,t; long double w,t;
GET_LDOUBLE_WORDS64(i0,i1,x); GET_LDOUBLE_WORDS64(i0,i1,x);
sx = (((u_int64_t)i0)>>63); sx = (((u_int64_t)i0)>>63);
j0 = ((i0>>48)&0x7fff)-0x3fff; j0 = ((i0>>48)&0x7fff)-0x3fff;
if(j0<48) { if(j0<112) {
if(j0<0) { if(j0<0) {
if(((i0&0x7fffffffffffffffLL)|i1)==0) return x;
i1 |= (i0&0x0000ffffffffffffLL);
i0 &= 0xffffe00000000000ULL;
i0 |= ((i1|-i1)>>16)&0x0000800000000000LL;
SET_LDOUBLE_MSW64(x,i0);
feholdexcept (&env); feholdexcept (&env);
w = TWO112[sx]+x; w = TWO112[sx]+x;
t = w-TWO112[sx]; t = w-TWO112[sx];
@@ -56,25 +51,11 @@ long double __nearbyintl(long double x)
GET_LDOUBLE_MSW64(i0,t); GET_LDOUBLE_MSW64(i0,t);
SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63)); SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
return t; return t;
}
} else { } else {
i = (0x0000ffffffffffffLL)>>j0;
if(((i0&i)|i1)==0) return x; /* x is integral */
i>>=1;
if(((i0&i)|i1)!=0) {
if(j0==47) i1 = 0x4000000000000000ULL; else
i0 = (i0&(~i))|((0x0000200000000000LL)>>j0);
}
}
} else if (j0>111) {
if(j0==0x4000) return x+x; /* inf or NaN */ if(j0==0x4000) return x+x; /* inf or NaN */
else return x; /* x is integral */ else return x; /* x is integral */
} else {
i = -1ULL>>(j0-48);
if((i1&i)==0) return x; /* x is integral */
i>>=1;
if((i1&i)!=0) i1 = (i1&(~i))|((0x4000000000000000LL)>>(j0-48));
} }
SET_LDOUBLE_WORDS64(x,i0,i1);
feholdexcept (&env); feholdexcept (&env);
w = TWO112[sx]+x; w = TWO112[sx]+x;
t = w-TWO112[sx]; t = w-TWO112[sx];

25
sysdeps/ieee754/ldbl-128/s_rintl.c
View File

@@ -39,42 +39,23 @@ TWO112[2]={
long double __rintl(long double x) long double __rintl(long double x)
{ {
int64_t i0,j0,sx; int64_t i0,j0,sx;
u_int64_t i,i1; u_int64_t i1;
long double w,t; long double w,t;
GET_LDOUBLE_WORDS64(i0,i1,x); GET_LDOUBLE_WORDS64(i0,i1,x);
sx = (((u_int64_t)i0)>>63); sx = (((u_int64_t)i0)>>63);
j0 = ((i0>>48)&0x7fff)-0x3fff; j0 = ((i0>>48)&0x7fff)-0x3fff;
if(j0<48) { if(j0<112) {
if(j0<0) { if(j0<0) {
if(((i0&0x7fffffffffffffffLL)|i1)==0) return x;
i1 |= (i0&0x0000ffffffffffffLL);
i0 &= 0xffffe00000000000ULL;
i0 |= ((i1|-i1)>>16)&0x0000800000000000LL;
SET_LDOUBLE_MSW64(x,i0);
w = TWO112[sx]+x; w = TWO112[sx]+x;
t = w-TWO112[sx]; t = w-TWO112[sx];
GET_LDOUBLE_MSW64(i0,t); GET_LDOUBLE_MSW64(i0,t);
SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63)); SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
return t; return t;
}
} else { } else {
i = (0x0000ffffffffffffLL)>>j0;
if(((i0&i)|i1)==0) return x; /* x is integral */
i>>=1;
if(((i0&i)|i1)!=0) {
if(j0==47) i1 = 0x4000000000000000ULL; else
i0 = (i0&(~i))|((0x0000200000000000LL)>>j0);
}
}
} else if (j0>111) {
if(j0==0x4000) return x+x; /* inf or NaN */ if(j0==0x4000) return x+x; /* inf or NaN */
else return x; /* x is integral */ else return x; /* x is integral */
} else {
i = -1ULL>>(j0-48);
if((i1&i)==0) return x; /* x is integral */
i>>=1;
if((i1&i)!=0) i1 = (i1&(~i))|((0x4000000000000000LL)>>(j0-48));
} }
SET_LDOUBLE_WORDS64(x,i0,i1);
w = TWO112[sx]+x; w = TWO112[sx]+x;
return w-TWO112[sx]; return w-TWO112[sx];
} }