diff options
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/e_fmodl.c | 27 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/math_ldbl.h | 10 |
3 files changed, 26 insertions, 18 deletions
diff --git a/ChangeLog b/ChangeLog index 938c7aa1eb..925e986f1f 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,10 @@ +2012-06-04 Adhemerval Zanella <azanella@linux.vnet.ibm.com> + + * sysdeps/ieee754/ldbl-128ibm/e_fmodl.c (__ieee754_fmodl): Fix + subnormal exponent extraction and add some __builtin_expect. + * sysdeps/ieee754/ldbl-128ibm/math_ldbl.h (ldbl_extract_mantissa): + Fix for subnormal mantissa calculation. + 2012-06-04 Mike Frysinger <vapier@gentoo.org> * sysdeps/unix/sysv/linux/tst-getcpu.c (do_test): Call perror when diff --git a/sysdeps/ieee754/ldbl-128ibm/e_fmodl.c b/sysdeps/ieee754/ldbl-128ibm/e_fmodl.c index 10cda317a9..31e709b5d5 100644 --- a/sysdeps/ieee754/ldbl-128ibm/e_fmodl.c +++ b/sysdeps/ieee754/ldbl-128ibm/e_fmodl.c @@ -27,8 +27,8 @@ static const long double one = 1.0, Zero[] = {0.0, -0.0,}; long double __ieee754_fmodl (long double x, long double y) { - int64_t n,hx,hy,hz,ix,iy,sx,i; - u_int64_t lx,ly,lz; + int64_t n,hx,hy,hz,ix,iy,sx; + u_int64_t lx,ly,lz, i; int temp; GET_LDOUBLE_WORDS64(hx,lx,x); @@ -38,41 +38,42 @@ __ieee754_fmodl (long double x, long double y) hy &= 0x7fffffffffffffffLL; /* |y| */ /* purge off exception values */ - if((hy|(ly&0x7fffffffffffffff))==0||(hx>=0x7ff0000000000000LL)|| /* y=0,or x not finite */ - (hy>0x7ff0000000000000LL)) /* or y is NaN */ + if(__builtin_expect((hy|(ly&0x7fffffffffffffff))==0 || + (hx>=0x7ff0000000000000LL)|| /* y=0,or x not finite */ + (hy>0x7ff0000000000000LL),0)) /* or y is NaN */ return (x*y)/(x*y); - if(hx<=hy) { + if(__builtin_expect(hx<=hy,0)) { if((hx<hy)||(lx<ly)) return x; /* |x|<|y| return x */ if(lx==ly) return Zero[(u_int64_t)sx>>63]; /* |x|=|y| return x*0*/ } /* determine ix = ilogb(x) */ - if(hx<0x0010000000000000LL) { /* subnormal x */ + if(__builtin_expect(hx<0x0010000000000000LL,0)) { /* subnormal x */ if(hx==0) { for (ix = -1043, i=lx; i>0; i<<=1) ix -=1; } else { - for (ix = -1022, i=hx<<19; i>0; i<<=1) ix -=1; + for (ix = -1022, i=(hx<<11); i>0; i<<=1) ix -=1; } } else ix = (hx>>52)-0x3ff; /* determine iy = ilogb(y) */ - if(hy<0x0010000000000000LL) { /* subnormal y */ + if(__builtin_expect(hy<0x0010000000000000LL,0)) { /* subnormal y */ if(hy==0) { for (iy = -1043, i=ly; i>0; i<<=1) iy -=1; } else { - for (iy = -1022, i=hy<<19; i>0; i<<=1) iy -=1; + for (iy = -1022, i=(hy<<11); i>0; i<<=1) iy -=1; } } else iy = (hy>>52)-0x3ff; /* Make the IBM extended format 105 bit mantissa look like the ieee854 112 - bit mantissa so the following operatations will give the correct + bit mantissa so the following operations will give the correct result. */ ldbl_extract_mantissa(&hx, &lx, &temp, x); ldbl_extract_mantissa(&hy, &ly, &temp, y); /* set up {hx,lx}, {hy,ly} and align y to x */ - if(ix >= -1022) + if(__builtin_expect(ix >= -1022, 1)) hx = 0x0001000000000000LL|(0x0000ffffffffffffLL&hx); else { /* subnormal x, shift x to normal */ n = -1022-ix; @@ -84,7 +85,7 @@ __ieee754_fmodl (long double x, long double y) lx = 0; } } - if(iy >= -1022) + if(__builtin_expect(iy >= -1022, 1)) hy = 0x0001000000000000LL|(0x0000ffffffffffffLL&hy); else { /* subnormal y, shift y to normal */ n = -1022-iy; @@ -118,7 +119,7 @@ __ieee754_fmodl (long double x, long double y) hx = hx+hx+(lx>>63); lx = lx+lx; iy -= 1; } - if(iy>= -1022) { /* normalize output */ + if(__builtin_expect(iy>= -1022,0)) { /* normalize output */ x = ldbl_insert_mantissa((sx>>63), iy, hx, lx); } else { /* subnormal output */ n = -1022 - iy; diff --git a/sysdeps/ieee754/ldbl-128ibm/math_ldbl.h b/sysdeps/ieee754/ldbl-128ibm/math_ldbl.h index d055d6597e..be9ac71cb0 100644 --- a/sysdeps/ieee754/ldbl-128ibm/math_ldbl.h +++ b/sysdeps/ieee754/ldbl-128ibm/math_ldbl.h @@ -6,20 +6,20 @@ #include <ieee754.h> static inline void -ldbl_extract_mantissa (int64_t *hi64, u_int64_t *lo64, int *exp, long double x) +ldbl_extract_mantissa (int64_t *hi64, uint64_t *lo64, int *exp, long double x) { /* We have 105 bits of mantissa plus one implicit digit. Since 106 bits are representable we use the first implicit digit for the number before the decimal point and the second implicit bit as bit 53 of the mantissa. */ - unsigned long long hi, lo; + uint64_t hi, lo; int ediff; union ibm_extended_long_double eldbl; eldbl.d = x; *exp = eldbl.ieee.exponent - IBM_EXTENDED_LONG_DOUBLE_BIAS; - lo = ((long long)eldbl.ieee.mantissa2 << 32) | eldbl.ieee.mantissa3; - hi = ((long long)eldbl.ieee.mantissa0 << 32) | eldbl.ieee.mantissa1; + lo = ((int64_t)eldbl.ieee.mantissa2 << 32) | eldbl.ieee.mantissa3; + hi = ((int64_t)eldbl.ieee.mantissa0 << 32) | eldbl.ieee.mantissa1; /* If the lower double is not a denomal or zero then set the hidden 53rd bit. */ if (eldbl.ieee.exponent2 > 0x001) @@ -31,8 +31,8 @@ ldbl_extract_mantissa (int64_t *hi64, u_int64_t *lo64, int *exp, long double x) ediff = eldbl.ieee.exponent - eldbl.ieee.exponent2; if (ediff > 53) lo = lo >> (ediff-53); + hi |= (1ULL << 52); } - hi |= (1ULL << 52); if ((eldbl.ieee.negative != eldbl.ieee.negative2) && ((eldbl.ieee.exponent2 != 0) && (lo != 0LL))) |