Commit 14d416f83b
Changed files (1)
src
src/parse_f128.c
@@ -16,7 +16,7 @@
#define shunget(f) ((f)->shlim>=0 ? (void)(f)->rpos-- : (void)0)
#define sh_fromstring(f, s) \
- ((f)->buf = (f)->rpos = (void *)(s), (f)->rend = (void*)-1)
+ ((f)->buf = (f)->rpos = (void *)(s), (f)->rend = (void*)-1)
#define LD_B1B_DIG 4
#define LD_B1B_MAX 10384593, 717069655, 257060992, 658440191
@@ -50,147 +50,147 @@
#if __BYTE_ORDER == __LITTLE_ENDIAN
union ldshape {
- float128_t f;
- struct {
- uint64_t lo;
- uint32_t mid;
- uint16_t top;
- uint16_t se;
- } i;
- struct {
- uint64_t lo;
- uint64_t hi;
- } i2;
+ float128_t f;
+ struct {
+ uint64_t lo;
+ uint32_t mid;
+ uint16_t top;
+ uint16_t se;
+ } i;
+ struct {
+ uint64_t lo;
+ uint64_t hi;
+ } i2;
};
#elif __BYTE_ORDER == __BIG_ENDIAN
union ldshape {
- float128_t f;
- struct {
- uint16_t se;
- uint16_t top;
- uint32_t mid;
- uint64_t lo;
- } i;
- struct {
- uint64_t hi;
- uint64_t lo;
- } i2;
+ float128_t f;
+ struct {
+ uint16_t se;
+ uint16_t top;
+ uint32_t mid;
+ uint64_t lo;
+ } i;
+ struct {
+ uint64_t hi;
+ uint64_t lo;
+ } i2;
};
#error Unsupported endian
#endif
struct MuslFILE {
- unsigned flags;
- unsigned char *rpos, *rend;
- int (*close)(struct MuslFILE *);
- unsigned char *wend, *wpos;
- unsigned char *mustbezero_1;
- unsigned char *wbase;
- size_t (*read)(struct MuslFILE *, unsigned char *, size_t);
- size_t (*write)(struct MuslFILE *, const unsigned char *, size_t);
- off_t (*seek)(struct MuslFILE *, off_t, int);
- unsigned char *buf;
- size_t buf_size;
- struct MuslFILE *prev, *next;
- int fd;
- int pipe_pid;
- long lockcount;
- int mode;
- volatile int lock;
- int lbf;
- void *cookie;
- off_t off;
- char *getln_buf;
- void *mustbezero_2;
- unsigned char *shend;
- off_t shlim, shcnt;
- struct MuslFILE *prev_locked, *next_locked;
- struct __locale_struct *locale;
+ unsigned flags;
+ unsigned char *rpos, *rend;
+ int (*close)(struct MuslFILE *);
+ unsigned char *wend, *wpos;
+ unsigned char *mustbezero_1;
+ unsigned char *wbase;
+ size_t (*read)(struct MuslFILE *, unsigned char *, size_t);
+ size_t (*write)(struct MuslFILE *, const unsigned char *, size_t);
+ off_t (*seek)(struct MuslFILE *, off_t, int);
+ unsigned char *buf;
+ size_t buf_size;
+ struct MuslFILE *prev, *next;
+ int fd;
+ int pipe_pid;
+ long lockcount;
+ int mode;
+ volatile int lock;
+ int lbf;
+ void *cookie;
+ off_t off;
+ char *getln_buf;
+ void *mustbezero_2;
+ unsigned char *shend;
+ off_t shlim, shcnt;
+ struct MuslFILE *prev_locked, *next_locked;
+ struct __locale_struct *locale;
};
static void __shlim(struct MuslFILE *f, off_t lim)
{
- f->shlim = lim;
- f->shcnt = f->buf - f->rpos;
- /* If lim is nonzero, rend must be a valid pointer. */
- if (lim && f->rend - f->rpos > lim)
- f->shend = f->rpos + lim;
- else
- f->shend = f->rend;
+ f->shlim = lim;
+ f->shcnt = f->buf - f->rpos;
+ /* If lim is nonzero, rend must be a valid pointer. */
+ if (lim && f->rend - f->rpos > lim)
+ f->shend = f->rpos + lim;
+ else
+ f->shend = f->rend;
}
static int __toread(struct MuslFILE *f)
{
- f->mode |= f->mode-1;
- if (f->wpos != f->wbase) f->write(f, 0, 0);
- f->wpos = f->wbase = f->wend = 0;
- if (f->flags & F_NORD) {
- f->flags |= F_ERR;
- return EOF;
- }
- f->rpos = f->rend = f->buf + f->buf_size;
- return (f->flags & F_EOF) ? EOF : 0;
+ f->mode |= f->mode-1;
+ if (f->wpos != f->wbase) f->write(f, 0, 0);
+ f->wpos = f->wbase = f->wend = 0;
+ if (f->flags & F_NORD) {
+ f->flags |= F_ERR;
+ return EOF;
+ }
+ f->rpos = f->rend = f->buf + f->buf_size;
+ return (f->flags & F_EOF) ? EOF : 0;
}
static int __uflow(struct MuslFILE *f)
{
- unsigned char c;
- if (!__toread(f) && f->read(f, &c, 1)==1) return c;
- return EOF;
+ unsigned char c;
+ if (!__toread(f) && f->read(f, &c, 1)==1) return c;
+ return EOF;
}
static int __shgetc(struct MuslFILE *f)
{
- int c;
- off_t cnt = shcnt(f);
- if ((f->shlim && cnt >= f->shlim) || (c=__uflow(f)) < 0) {
- f->shcnt = f->buf - f->rpos + cnt;
- f->shend = f->rpos;
- f->shlim = -1;
- return EOF;
- }
- cnt++;
- if (f->shlim && f->rend - f->rpos > f->shlim - cnt)
- f->shend = f->rpos + (f->shlim - cnt);
- else
- f->shend = f->rend;
- f->shcnt = f->buf - f->rpos + cnt;
- if (f->rpos[-1] != c) f->rpos[-1] = c;
- return c;
+ int c;
+ off_t cnt = shcnt(f);
+ if ((f->shlim && cnt >= f->shlim) || (c=__uflow(f)) < 0) {
+ f->shcnt = f->buf - f->rpos + cnt;
+ f->shend = f->rpos;
+ f->shlim = -1;
+ return EOF;
+ }
+ cnt++;
+ if (f->shlim && f->rend - f->rpos > f->shlim - cnt)
+ f->shend = f->rpos + (f->shlim - cnt);
+ else
+ f->shend = f->rend;
+ f->shcnt = f->buf - f->rpos + cnt;
+ if (f->rpos[-1] != c) f->rpos[-1] = c;
+ return c;
}
static long long scanexp(struct MuslFILE *f, int pok)
{
- int c;
- int x;
- long long y;
- int neg = 0;
-
- c = shgetc(f);
- if (c=='+' || c=='-') {
- neg = (c=='-');
- c = shgetc(f);
- if (c-'0'>=10U && pok) shunget(f);
- }
- if (c-'0'>=10U) {
- shunget(f);
- return LLONG_MIN;
- }
- for (x=0; c-'0'<10U && x<INT_MAX/10; c = shgetc(f))
- x = 10*x + c-'0';
- for (y=x; c-'0'<10U && y<LLONG_MAX/100; c = shgetc(f))
- y = 10*y + c-'0';
- for (; c-'0'<10U; c = shgetc(f));
- shunget(f);
- return neg ? -y : y;
+ int c;
+ int x;
+ long long y;
+ int neg = 0;
+
+ c = shgetc(f);
+ if (c=='+' || c=='-') {
+ neg = (c=='-');
+ c = shgetc(f);
+ if (c-'0'>=10U && pok) shunget(f);
+ }
+ if (c-'0'>=10U) {
+ shunget(f);
+ return LLONG_MIN;
+ }
+ for (x=0; c-'0'<10U && x<INT_MAX/10; c = shgetc(f))
+ x = 10*x + c-'0';
+ for (y=x; c-'0'<10U && y<LLONG_MAX/100; c = shgetc(f))
+ y = 10*y + c-'0';
+ for (; c-'0'<10U; c = shgetc(f));
+ shunget(f);
+ return neg ? -y : y;
}
static float128_t copysignf128(float128_t x, float128_t y)
{
- union ldshape ux = {x}, uy = {y};
- ux.i.se &= 0x7fff;
- ux.i.se |= uy.i.se & 0x8000;
- return ux.f;
+ union ldshape ux = {x}, uy = {y};
+ ux.i.se &= 0x7fff;
+ ux.i.se |= uy.i.se & 0x8000;
+ return ux.f;
}
static void mul_eq_f128_float(float128_t *x, float op_float) {
@@ -214,101 +214,101 @@ static float128_t dbl_to_f128(double x) {
static float128_t fmodf128(float128_t x, float128_t y)
{
- union ldshape ux = {x}, uy = {y};
- int ex = ux.i.se & 0x7fff;
- int ey = uy.i.se & 0x7fff;
- int sx = ux.i.se & 0x8000;
+ union ldshape ux = {x}, uy = {y};
+ int ex = ux.i.se & 0x7fff;
+ int ey = uy.i.se & 0x7fff;
+ int sx = ux.i.se & 0x8000;
float128_t zero;
ui32_to_f128M(0, &zero);
// if (y == 0 || isnan(y) || ex == 0x7fff)
- if (f128M_eq(&y, &zero) || f128M_isSignalingNaN(&y) || ex == 0x7fff) {
- //return (x*y)/(x*y);
+ if (f128M_eq(&y, &zero) || f128M_isSignalingNaN(&y) || ex == 0x7fff) {
+ //return (x*y)/(x*y);
float128_t x_times_y;
f128M_mul(&x, &y, &x_times_y);
float128_t result;
f128M_div(&x_times_y, &x_times_y, &result);
return result;
}
- ux.i.se = ex;
- uy.i.se = ey;
- //if (ux.f <= uy.f) {
+ ux.i.se = ex;
+ uy.i.se = ey;
+ //if (ux.f <= uy.f) {
if (f128M_le(&ux.f, &uy.f)) {
- //if (ux.f == uy.f) {
- if (f128M_eq(&ux.f, &uy.f)) {
- //return 0*x;
+ //if (ux.f == uy.f) {
+ if (f128M_eq(&ux.f, &uy.f)) {
+ //return 0*x;
float128_t result;
f128M_mul(&zero, &x, &result);
return result;
}
- return x;
- }
+ return x;
+ }
- /* normalize x and y */
- if (!ex) {
- //ux.f *= 0x1p120f;
+ /* normalize x and y */
+ if (!ex) {
+ //ux.f *= 0x1p120f;
mul_eq_f128_float(&ux.f, 0x1p120f);
- ex = ux.i.se - 120;
- }
- if (!ey) {
- //uy.f *= 0x1p120f;
+ ex = ux.i.se - 120;
+ }
+ if (!ey) {
+ //uy.f *= 0x1p120f;
mul_eq_f128_float(&uy.f, 0x1p120f);
- ey = uy.i.se - 120;
- }
-
- /* x mod y */
- uint64_t hi, lo, xhi, xlo, yhi, ylo;
- xhi = (ux.i2.hi & -1ULL>>16) | 1ULL<<48;
- yhi = (uy.i2.hi & -1ULL>>16) | 1ULL<<48;
- xlo = ux.i2.lo;
- ylo = uy.i2.lo;
- for (; ex > ey; ex--) {
- hi = xhi - yhi;
- lo = xlo - ylo;
- if (xlo < ylo)
- hi -= 1;
- if (hi >> 63 == 0) {
- if ((hi|lo) == 0) {
- //return 0*x;
+ ey = uy.i.se - 120;
+ }
+
+ /* x mod y */
+ uint64_t hi, lo, xhi, xlo, yhi, ylo;
+ xhi = (ux.i2.hi & -1ULL>>16) | 1ULL<<48;
+ yhi = (uy.i2.hi & -1ULL>>16) | 1ULL<<48;
+ xlo = ux.i2.lo;
+ ylo = uy.i2.lo;
+ for (; ex > ey; ex--) {
+ hi = xhi - yhi;
+ lo = xlo - ylo;
+ if (xlo < ylo)
+ hi -= 1;
+ if (hi >> 63 == 0) {
+ if ((hi|lo) == 0) {
+ //return 0*x;
float128_t result;
f128M_mul(&zero, &x, &result);
return result;
}
- xhi = 2*hi + (lo>>63);
- xlo = 2*lo;
- } else {
- xhi = 2*xhi + (xlo>>63);
- xlo = 2*xlo;
- }
- }
- hi = xhi - yhi;
- lo = xlo - ylo;
- if (xlo < ylo)
- hi -= 1;
- if (hi >> 63 == 0) {
- if ((hi|lo) == 0) {
- //return 0*x;
+ xhi = 2*hi + (lo>>63);
+ xlo = 2*lo;
+ } else {
+ xhi = 2*xhi + (xlo>>63);
+ xlo = 2*xlo;
+ }
+ }
+ hi = xhi - yhi;
+ lo = xlo - ylo;
+ if (xlo < ylo)
+ hi -= 1;
+ if (hi >> 63 == 0) {
+ if ((hi|lo) == 0) {
+ //return 0*x;
float128_t result;
f128M_mul(&zero, &x, &result);
return result;
}
- xhi = hi;
- xlo = lo;
- }
- for (; xhi >> 48 == 0; xhi = 2*xhi + (xlo>>63), xlo = 2*xlo, ex--);
- ux.i2.hi = xhi;
- ux.i2.lo = xlo;
-
- /* scale result */
- if (ex <= 0) {
- ux.i.se = (ex+120)|sx;
- //ux.f *= 0x1p-120f;
- mul_eq_f128_float(&ux.f, 0x1p-120f);
- } else
- ux.i.se = ex|sx;
- return ux.f;
+ xhi = hi;
+ xlo = lo;
+ }
+ for (; xhi >> 48 == 0; xhi = 2*xhi + (xlo>>63), xlo = 2*xlo, ex--);
+ ux.i2.hi = xhi;
+ ux.i2.lo = xlo;
+
+ /* scale result */
+ if (ex <= 0) {
+ ux.i.se = (ex+120)|sx;
+ //ux.f *= 0x1p-120f;
+ mul_eq_f128_float(&ux.f, 0x1p-120f);
+ } else
+ ux.i.se = ex|sx;
+ return ux.f;
}
static float128_t int_mul_f128_cast_u32(int sign, uint32_t x0) {
@@ -348,7 +348,7 @@ static void mul_eq_f128_int(float128_t *y, int sign) {
}
static float128_t make_f128(uint64_t hi, uint64_t lo) {
- union ldshape ux;
+ union ldshape ux;
ux.i2.hi = hi;
ux.i2.lo = lo;
return ux.f;
@@ -374,21 +374,21 @@ static void add_eq_f128_dbl(float128_t *a, double b) {
static float128_t scalbnf128(float128_t x, int n)
{
- union ldshape u;
+ union ldshape u;
- if (n > 16383) {
- //x *= 0x1p16383q;
+ if (n > 16383) {
+ //x *= 0x1p16383q;
mul_eq_f128_f128(&x, make_f128(0x7ffe000000000000, 0x0000000000000000));
- n -= 16383;
- if (n > 16383) {
- //x *= 0x1p16383q;
+ n -= 16383;
+ if (n > 16383) {
+ //x *= 0x1p16383q;
mul_eq_f128_f128(&x, make_f128(0x7ffe000000000000, 0x0000000000000000));
- n -= 16383;
- if (n > 16383)
- n = 16383;
- }
- } else if (n < -16382) {
- //x *= 0x1p-16382q * 0x1p113q;
+ n -= 16383;
+ if (n > 16383)
+ n = 16383;
+ }
+ } else if (n < -16382) {
+ //x *= 0x1p-16382q * 0x1p113q;
{
float128_t mul_result;
float128_t a = make_f128(0x0001000000000000, 0x0000000000000000);
@@ -396,9 +396,9 @@ static float128_t scalbnf128(float128_t x, int n)
f128M_mul(&a, &b, &mul_result);
mul_eq_f128_f128(&x, mul_result);
}
- n += 16382 - 113;
- if (n < -16382) {
- //x *= 0x1p-16382q * 0x1p113q;
+ n += 16382 - 113;
+ if (n < -16382) {
+ //x *= 0x1p-16382q * 0x1p113q;
{
float128_t mul_result;
float128_t a = make_f128(0x0001000000000000, 0x0000000000000000);
@@ -406,113 +406,113 @@ static float128_t scalbnf128(float128_t x, int n)
f128M_mul(&a, &b, &mul_result);
mul_eq_f128_f128(&x, mul_result);
}
- n += 16382 - 113;
- if (n < -16382)
- n = -16382;
- }
- }
- //u.f = 1.0;
+ n += 16382 - 113;
+ if (n < -16382)
+ n = -16382;
+ }
+ }
+ //u.f = 1.0;
ui32_to_f128M(1, &u.f);
- u.i.se = 0x3fff + n;
+ u.i.se = 0x3fff + n;
mul_eq_f128_f128(&x, u.f);
return x;
}
static float128_t fabsf128(float128_t x)
{
- union ldshape u = {x};
+ union ldshape u = {x};
- u.i.se &= 0x7fff;
- return u.f;
+ u.i.se &= 0x7fff;
+ return u.f;
}
static float128_t decfloat(struct MuslFILE *f, int c, int bits, int emin, int sign, int pok)
{
- uint32_t x[KMAX];
- static const uint32_t th[] = { LD_B1B_MAX };
- int i, j, k, a, z;
- long long lrp=0, dc=0;
- long long e10=0;
- int lnz = 0;
- int gotdig = 0, gotrad = 0;
- int rp;
- int e2;
- int emax = -emin-bits+3;
- int denormal = 0;
- float128_t y;
+ uint32_t x[KMAX];
+ static const uint32_t th[] = { LD_B1B_MAX };
+ int i, j, k, a, z;
+ long long lrp=0, dc=0;
+ long long e10=0;
+ int lnz = 0;
+ int gotdig = 0, gotrad = 0;
+ int rp;
+ int e2;
+ int emax = -emin-bits+3;
+ int denormal = 0;
+ float128_t y;
float128_t zero;
ui32_to_f128M(0, &zero);
- float128_t frac=zero;
- float128_t bias=zero;
- static const int p10s[] = { 10, 100, 1000, 10000,
- 100000, 1000000, 10000000, 100000000 };
-
- j=0;
- k=0;
-
- /* Don't let leading zeros consume buffer space */
- for (; c=='0'; c = shgetc(f)) gotdig=1;
- if (c=='.') {
- gotrad = 1;
- for (c = shgetc(f); c=='0'; c = shgetc(f)) gotdig=1, lrp--;
- }
-
- x[0] = 0;
- for (; c-'0'<10U || c=='.'; c = shgetc(f)) {
- if (c == '.') {
- if (gotrad) break;
- gotrad = 1;
- lrp = dc;
- } else if (k < KMAX-3) {
- dc++;
- if (c!='0') lnz = dc;
- if (j) x[k] = x[k]*10 + c-'0';
- else x[k] = c-'0';
- if (++j==9) {
- k++;
- j=0;
- }
- gotdig=1;
- } else {
- dc++;
- if (c!='0') {
- lnz = (KMAX-4)*9;
- x[KMAX-4] |= 1;
- }
- }
- }
- if (!gotrad) lrp=dc;
-
- if (gotdig && (c|32)=='e') {
- e10 = scanexp(f, pok);
- if (e10 == LLONG_MIN) {
- if (pok) {
- shunget(f);
- } else {
- shlim(f, 0);
- return zero;
- }
- e10 = 0;
- }
- lrp += e10;
- } else if (c>=0) {
- shunget(f);
- }
- if (!gotdig) {
- errno = EINVAL;
- shlim(f, 0);
- return zero;
- }
-
- /* Handle zero specially to avoid nasty special cases later */
- if (!x[0]) {
+ float128_t frac=zero;
+ float128_t bias=zero;
+ static const int p10s[] = { 10, 100, 1000, 10000,
+ 100000, 1000000, 10000000, 100000000 };
+
+ j=0;
+ k=0;
+
+ /* Don't let leading zeros consume buffer space */
+ for (; c=='0'; c = shgetc(f)) gotdig=1;
+ if (c=='.') {
+ gotrad = 1;
+ for (c = shgetc(f); c=='0'; c = shgetc(f)) gotdig=1, lrp--;
+ }
+
+ x[0] = 0;
+ for (; c-'0'<10U || c=='.'; c = shgetc(f)) {
+ if (c == '.') {
+ if (gotrad) break;
+ gotrad = 1;
+ lrp = dc;
+ } else if (k < KMAX-3) {
+ dc++;
+ if (c!='0') lnz = dc;
+ if (j) x[k] = x[k]*10 + c-'0';
+ else x[k] = c-'0';
+ if (++j==9) {
+ k++;
+ j=0;
+ }
+ gotdig=1;
+ } else {
+ dc++;
+ if (c!='0') {
+ lnz = (KMAX-4)*9;
+ x[KMAX-4] |= 1;
+ }
+ }
+ }
+ if (!gotrad) lrp=dc;
+
+ if (gotdig && (c|32)=='e') {
+ e10 = scanexp(f, pok);
+ if (e10 == LLONG_MIN) {
+ if (pok) {
+ shunget(f);
+ } else {
+ shlim(f, 0);
+ return zero;
+ }
+ e10 = 0;
+ }
+ lrp += e10;
+ } else if (c>=0) {
+ shunget(f);
+ }
+ if (!gotdig) {
+ errno = EINVAL;
+ shlim(f, 0);
+ return zero;
+ }
+
+ /* Handle zero specially to avoid nasty special cases later */
+ if (!x[0]) {
//return sign * 0.0;
return dbl_to_f128(sign * 0.0);
}
- /* Optimize small integers (w/no exponent) and over/under-flow */
- if (lrp==dc && dc<10 && (bits>30 || x[0]>>bits==0)) {
- //return sign * (float128_t)x[0];
+ /* Optimize small integers (w/no exponent) and over/under-flow */
+ if (lrp==dc && dc<10 && (bits>30 || x[0]>>bits==0)) {
+ //return sign * (float128_t)x[0];
float128_t sign_f128;
i32_to_f128M(sign, &sign_f128);
float128_t x0_f128;
@@ -521,131 +521,131 @@ static float128_t decfloat(struct MuslFILE *f, int c, int bits, int emin, int si
f128M_mul(&sign_f128, &x0_f128, &result);
return result;
}
- if (lrp > -emin/2) {
- errno = ERANGE;
- //return sign * LDBL_MAX * LDBL_MAX;
- return zero;
- }
- if (lrp < emin-2*LDBL_MANT_DIG) {
- errno = ERANGE;
- //return sign * LDBL_MIN * LDBL_MIN;
- return zero;
- }
-
- /* Align incomplete final B1B digit */
- if (j) {
- for (; j<9; j++) x[k]*=10;
- k++;
- j=0;
- }
-
- a = 0;
- z = k;
- e2 = 0;
- rp = lrp;
-
- /* Optimize small to mid-size integers (even in exp. notation) */
- if (lnz<9 && lnz<=rp && rp < 18) {
- if (rp == 9) {
+ if (lrp > -emin/2) {
+ errno = ERANGE;
+ //return sign * LDBL_MAX * LDBL_MAX;
+ return zero;
+ }
+ if (lrp < emin-2*LDBL_MANT_DIG) {
+ errno = ERANGE;
+ //return sign * LDBL_MIN * LDBL_MIN;
+ return zero;
+ }
+
+ /* Align incomplete final B1B digit */
+ if (j) {
+ for (; j<9; j++) x[k]*=10;
+ k++;
+ j=0;
+ }
+
+ a = 0;
+ z = k;
+ e2 = 0;
+ rp = lrp;
+
+ /* Optimize small to mid-size integers (even in exp. notation) */
+ if (lnz<9 && lnz<=rp && rp < 18) {
+ if (rp == 9) {
//return sign * (float128_t)(x[0]);
return int_mul_f128_cast_u32(sign, x[0]);
}
- if (rp < 9) {
+ if (rp < 9) {
//return sign * (float128_t)(x[0]) / p10s[8-rp];
return triple_divide(sign, x[0], p10s[8-rp]);
}
- int bitlim = bits-3*(int)(rp-9);
- if (bitlim>30 || x[0]>>bitlim==0)
- //return sign * (float128_t)(x[0]) * p10s[rp-10];
- return triple_multiply(sign, x[0], p10s[rp-10]);
- }
-
- /* Drop trailing zeros */
- for (; !x[z-1]; z--);
-
- /* Align radix point to B1B digit boundary */
- if (rp % 9) {
- int rpm9 = rp>=0 ? rp%9 : rp%9+9;
- int p10 = p10s[8-rpm9];
- uint32_t carry = 0;
- for (k=a; k!=z; k++) {
- uint32_t tmp = x[k] % p10;
- x[k] = x[k]/p10 + carry;
- carry = 1000000000/p10 * tmp;
- if (k==a && !x[k]) {
- a = (a+1 & MASK);
- rp -= 9;
- }
- }
- if (carry) x[z++] = carry;
- rp += 9-rpm9;
- }
-
- /* Upscale until desired number of bits are left of radix point */
- while (rp < 9*LD_B1B_DIG || (rp == 9*LD_B1B_DIG && x[a]<th[0])) {
- uint32_t carry = 0;
- e2 -= 29;
- for (k=(z-1 & MASK); ; k=(k-1 & MASK)) {
- uint64_t tmp = ((uint64_t)x[k] << 29) + carry;
- if (tmp > 1000000000) {
- carry = tmp / 1000000000;
- x[k] = tmp % 1000000000;
- } else {
- carry = 0;
- x[k] = tmp;
- }
- if (k==(z-1 & MASK) && k!=a && !x[k]) z = k;
- if (k==a) break;
- }
- if (carry) {
- rp += 9;
- a = (a-1 & MASK);
- if (a == z) {
- z = (z-1 & MASK);
- x[z-1 & MASK] |= x[z];
- }
- x[a] = carry;
- }
- }
-
- /* Downscale until exactly number of bits are left of radix point */
- for (;;) {
- uint32_t carry = 0;
- int sh = 1;
- for (i=0; i<LD_B1B_DIG; i++) {
- k = (a+i & MASK);
- if (k == z || x[k] < th[i]) {
- i=LD_B1B_DIG;
- break;
- }
- if (x[a+i & MASK] > th[i]) break;
- }
- if (i==LD_B1B_DIG && rp==9*LD_B1B_DIG) break;
- /* FIXME: find a way to compute optimal sh */
- if (rp > 9+9*LD_B1B_DIG) sh = 9;
- e2 += sh;
- for (k=a; k!=z; k=(k+1 & MASK)) {
- uint32_t tmp = x[k] & (1<<sh)-1;
- x[k] = (x[k]>>sh) + carry;
- carry = (1000000000>>sh) * tmp;
- if (k==a && !x[k]) {
- a = (a+1 & MASK);
- i--;
- rp -= 9;
- }
- }
- if (carry) {
- if ((z+1 & MASK) != a) {
- x[z] = carry;
- z = (z+1 & MASK);
- } else x[z-1 & MASK] |= 1;
- }
- }
-
- /* Assemble desired bits into floating point variable */
- for (y=zero,i=0; i<LD_B1B_DIG; i++) {
- if ((a+i & MASK)==z) x[(z=(z+1 & MASK))-1] = 0;
- //y = 1000000000.0L * y + x[a+i & MASK];
+ int bitlim = bits-3*(int)(rp-9);
+ if (bitlim>30 || x[0]>>bitlim==0)
+ //return sign * (float128_t)(x[0]) * p10s[rp-10];
+ return triple_multiply(sign, x[0], p10s[rp-10]);
+ }
+
+ /* Drop trailing zeros */
+ for (; !x[z-1]; z--);
+
+ /* Align radix point to B1B digit boundary */
+ if (rp % 9) {
+ int rpm9 = rp>=0 ? rp%9 : rp%9+9;
+ int p10 = p10s[8-rpm9];
+ uint32_t carry = 0;
+ for (k=a; k!=z; k++) {
+ uint32_t tmp = x[k] % p10;
+ x[k] = x[k]/p10 + carry;
+ carry = 1000000000/p10 * tmp;
+ if (k==a && !x[k]) {
+ a = (a+1 & MASK);
+ rp -= 9;
+ }
+ }
+ if (carry) x[z++] = carry;
+ rp += 9-rpm9;
+ }
+
+ /* Upscale until desired number of bits are left of radix point */
+ while (rp < 9*LD_B1B_DIG || (rp == 9*LD_B1B_DIG && x[a]<th[0])) {
+ uint32_t carry = 0;
+ e2 -= 29;
+ for (k=(z-1 & MASK); ; k=(k-1 & MASK)) {
+ uint64_t tmp = ((uint64_t)x[k] << 29) + carry;
+ if (tmp > 1000000000) {
+ carry = tmp / 1000000000;
+ x[k] = tmp % 1000000000;
+ } else {
+ carry = 0;
+ x[k] = tmp;
+ }
+ if (k==(z-1 & MASK) && k!=a && !x[k]) z = k;
+ if (k==a) break;
+ }
+ if (carry) {
+ rp += 9;
+ a = (a-1 & MASK);
+ if (a == z) {
+ z = (z-1 & MASK);
+ x[z-1 & MASK] |= x[z];
+ }
+ x[a] = carry;
+ }
+ }
+
+ /* Downscale until exactly number of bits are left of radix point */
+ for (;;) {
+ uint32_t carry = 0;
+ int sh = 1;
+ for (i=0; i<LD_B1B_DIG; i++) {
+ k = (a+i & MASK);
+ if (k == z || x[k] < th[i]) {
+ i=LD_B1B_DIG;
+ break;
+ }
+ if (x[a+i & MASK] > th[i]) break;
+ }
+ if (i==LD_B1B_DIG && rp==9*LD_B1B_DIG) break;
+ /* FIXME: find a way to compute optimal sh */
+ if (rp > 9+9*LD_B1B_DIG) sh = 9;
+ e2 += sh;
+ for (k=a; k!=z; k=(k+1 & MASK)) {
+ uint32_t tmp = x[k] & (1<<sh)-1;
+ x[k] = (x[k]>>sh) + carry;
+ carry = (1000000000>>sh) * tmp;
+ if (k==a && !x[k]) {
+ a = (a+1 & MASK);
+ i--;
+ rp -= 9;
+ }
+ }
+ if (carry) {
+ if ((z+1 & MASK) != a) {
+ x[z] = carry;
+ z = (z+1 & MASK);
+ } else x[z-1 & MASK] |= 1;
+ }
+ }
+
+ /* Assemble desired bits into floating point variable */
+ for (y=zero,i=0; i<LD_B1B_DIG; i++) {
+ if ((a+i & MASK)==z) x[(z=(z+1 & MASK))-1] = 0;
+ //y = 1000000000.0L * y + x[a+i & MASK];
float128_t const_f128;
ui64_to_f128M(1000000000, &const_f128);
float128_t mul_y;
@@ -653,56 +653,56 @@ static float128_t decfloat(struct MuslFILE *f, int c, int bits, int emin, int si
float128_t x_f128;
ui32_to_f128M(x[a+i & MASK], &x_f128);
f128M_add(&mul_y, &x_f128, &y);
- }
+ }
- //y *= sign;
+ //y *= sign;
mul_eq_f128_int(&y, sign);
- /* Limit precision for denormal results */
- if (bits > LDBL_MANT_DIG+e2-emin) {
- bits = LDBL_MANT_DIG+e2-emin;
- if (bits<0) bits=0;
- denormal = 1;
- }
-
- /* Calculate bias term to force rounding, move out lower bits */
- if (bits < LDBL_MANT_DIG) {
- bias = copysignf128(dbl_to_f128(scalbn(1, 2*LDBL_MANT_DIG-bits-1)), y);
- frac = fmodf128(y, dbl_to_f128(scalbn(1, LDBL_MANT_DIG-bits)));
- //y -= frac;
+ /* Limit precision for denormal results */
+ if (bits > LDBL_MANT_DIG+e2-emin) {
+ bits = LDBL_MANT_DIG+e2-emin;
+ if (bits<0) bits=0;
+ denormal = 1;
+ }
+
+ /* Calculate bias term to force rounding, move out lower bits */
+ if (bits < LDBL_MANT_DIG) {
+ bias = copysignf128(dbl_to_f128(scalbn(1, 2*LDBL_MANT_DIG-bits-1)), y);
+ frac = fmodf128(y, dbl_to_f128(scalbn(1, LDBL_MANT_DIG-bits)));
+ //y -= frac;
{
float128_t new_value;
f128M_sub(&y, &frac, &new_value);
y = new_value;
}
- //y += bias;
+ //y += bias;
{
float128_t new_value;
f128M_add(&y, &frac, &new_value);
y = new_value;
}
- }
+ }
- /* Process tail of decimal input so it can affect rounding */
- if ((a+i & MASK) != z) {
- uint32_t t = x[a+i & MASK];
- if (t < 500000000 && (t || (a+i+1 & MASK) != z)) {
- //frac += 0.25*sign;
+ /* Process tail of decimal input so it can affect rounding */
+ if ((a+i & MASK) != z) {
+ uint32_t t = x[a+i & MASK];
+ if (t < 500000000 && (t || (a+i+1 & MASK) != z)) {
+ //frac += 0.25*sign;
add_eq_f128_dbl(&frac, 0.25*sign);
} else if (t > 500000000) {
- //frac += 0.75*sign;
+ //frac += 0.75*sign;
add_eq_f128_dbl(&frac, 0.75*sign);
} else if (t == 500000000) {
- if ((a+i+1 & MASK) == z) {
- //frac += 0.5*sign;
+ if ((a+i+1 & MASK) == z) {
+ //frac += 0.5*sign;
add_eq_f128_dbl(&frac, 0.5*sign);
} else {
- //frac += 0.75*sign;
+ //frac += 0.75*sign;
add_eq_f128_dbl(&frac, 0.75*sign);
}
- }
- //if (LDBL_MANT_DIG-bits >= 2 && !fmodf128(frac, 1))
- if (LDBL_MANT_DIG-bits >= 2) {
+ }
+ //if (LDBL_MANT_DIG-bits >= 2 && !fmodf128(frac, 1))
+ if (LDBL_MANT_DIG-bits >= 2) {
float128_t one;
ui32_to_f128M(1, &one);
float128_t mod_result = fmodf128(frac, one);
@@ -711,29 +711,29 @@ static float128_t decfloat(struct MuslFILE *f, int c, int bits, int emin, int si
add_eq_f128_dbl(&frac, 1.0);
}
}
- }
+ }
- //y += frac;
+ //y += frac;
{
float128_t new_value;
f128M_add(&y, &frac, &new_value);
y = new_value;
}
- //y -= bias;
+ //y -= bias;
{
float128_t new_value;
f128M_sub(&y, &bias, &new_value);
y = new_value;
}
- if ((e2+LDBL_MANT_DIG & INT_MAX) > emax-5) {
- //if (fabsf128(y) >= 0x1p113)
+ if ((e2+LDBL_MANT_DIG & INT_MAX) > emax-5) {
+ //if (fabsf128(y) >= 0x1p113)
float128_t abs_y = fabsf128(y);
float128_t mant_f128 = make_f128(0x4070000000000000, 0x0000000000000000);
- if (!f128M_lt(&abs_y, &mant_f128)) {
- if (denormal && bits==LDBL_MANT_DIG+e2-emin)
- denormal = 0;
- //y *= 0.5;
+ if (!f128M_lt(&abs_y, &mant_f128)) {
+ if (denormal && bits==LDBL_MANT_DIG+e2-emin)
+ denormal = 0;
+ //y *= 0.5;
{
float128_t point_5 = dbl_to_f128(0.5);
float128_t new_value;
@@ -741,13 +741,13 @@ static float128_t decfloat(struct MuslFILE *f, int c, int bits, int emin, int si
y = new_value;
}
- e2++;
- }
- if (e2+LDBL_MANT_DIG>emax || (denormal && !f128M_eq(&frac, &zero)))
- errno = ERANGE;
- }
+ e2++;
+ }
+ if (e2+LDBL_MANT_DIG>emax || (denormal && !f128M_eq(&frac, &zero)))
+ errno = ERANGE;
+ }
- return scalbnf128(y, e2);
+ return scalbnf128(y, e2);
}
static float128_t hexfloat(struct MuslFILE *f, int bits, int emin, int sign, int pok)
@@ -760,42 +760,42 @@ static float128_t hexfloat(struct MuslFILE *f, int bits, int emin, int sign, int
ui32_to_f128M(16, &sixteen);
float128_t point_5 = dbl_to_f128(0.5);
- uint32_t x = 0;
- float128_t y = zero;
- float128_t scale = one;
- float128_t bias = zero;
- int gottail = 0, gotrad = 0, gotdig = 0;
- long long rp = 0;
- long long dc = 0;
- long long e2 = 0;
- int d;
- int c;
-
- c = shgetc(f);
-
- /* Skip leading zeros */
- for (; c=='0'; c = shgetc(f)) gotdig = 1;
-
- if (c=='.') {
- gotrad = 1;
- c = shgetc(f);
- /* Count zeros after the radix point before significand */
- for (rp=0; c=='0'; c = shgetc(f), rp--) gotdig = 1;
- }
-
- for (; c-'0'<10U || (c|32)-'a'<6U || c=='.'; c = shgetc(f)) {
- if (c=='.') {
- if (gotrad) break;
- rp = dc;
- gotrad = 1;
- } else {
- gotdig = 1;
- if (c > '9') d = (c|32)+10-'a';
- else d = c-'0';
- if (dc<8) {
- x = x*16 + d;
- } else if (dc < LDBL_MANT_DIG/4+1) {
- //y += d*(scale/=16);
+ uint32_t x = 0;
+ float128_t y = zero;
+ float128_t scale = one;
+ float128_t bias = zero;
+ int gottail = 0, gotrad = 0, gotdig = 0;
+ long long rp = 0;
+ long long dc = 0;
+ long long e2 = 0;
+ int d;
+ int c;
+
+ c = shgetc(f);
+
+ /* Skip leading zeros */
+ for (; c=='0'; c = shgetc(f)) gotdig = 1;
+
+ if (c=='.') {
+ gotrad = 1;
+ c = shgetc(f);
+ /* Count zeros after the radix point before significand */
+ for (rp=0; c=='0'; c = shgetc(f), rp--) gotdig = 1;
+ }
+
+ for (; c-'0'<10U || (c|32)-'a'<6U || c=='.'; c = shgetc(f)) {
+ if (c=='.') {
+ if (gotrad) break;
+ rp = dc;
+ gotrad = 1;
+ } else {
+ gotdig = 1;
+ if (c > '9') d = (c|32)+10-'a';
+ else d = c-'0';
+ if (dc<8) {
+ x = x*16 + d;
+ } else if (dc < LDBL_MANT_DIG/4+1) {
+ //y += d*(scale/=16);
{
float128_t divided;
f128M_div(&scale, &sixteen, ÷d);
@@ -808,8 +808,8 @@ static float128_t hexfloat(struct MuslFILE *f, int bits, int emin, int sign, int
f128M_add(&y, &add_op, &new_y);
y = new_y;
}
- } else if (d && !gottail) {
- //y += 0.5*scale;
+ } else if (d && !gottail) {
+ //y += 0.5*scale;
{
float128_t add_op;
f128M_mul(&point_5, &scale, &add_op);
@@ -817,60 +817,60 @@ static float128_t hexfloat(struct MuslFILE *f, int bits, int emin, int sign, int
f128M_add(&y, &add_op, &new_y);
y = new_y;
}
- gottail = 1;
- }
- dc++;
- }
- }
- if (!gotdig) {
- shunget(f);
- if (pok) {
- shunget(f);
- if (gotrad) shunget(f);
- } else {
- shlim(f, 0);
- }
- //return sign * 0.0;
+ gottail = 1;
+ }
+ dc++;
+ }
+ }
+ if (!gotdig) {
+ shunget(f);
+ if (pok) {
+ shunget(f);
+ if (gotrad) shunget(f);
+ } else {
+ shlim(f, 0);
+ }
+ //return sign * 0.0;
return dbl_to_f128(sign * 0.0);
- }
- if (!gotrad) rp = dc;
- while (dc<8) x *= 16, dc++;
- if ((c|32)=='p') {
- e2 = scanexp(f, pok);
- if (e2 == LLONG_MIN) {
- if (pok) {
- shunget(f);
- } else {
- shlim(f, 0);
- return zero;
- }
- e2 = 0;
- }
- } else {
- shunget(f);
- }
- e2 += 4*rp - 32;
-
- if (!x) {
+ }
+ if (!gotrad) rp = dc;
+ while (dc<8) x *= 16, dc++;
+ if ((c|32)=='p') {
+ e2 = scanexp(f, pok);
+ if (e2 == LLONG_MIN) {
+ if (pok) {
+ shunget(f);
+ } else {
+ shlim(f, 0);
+ return zero;
+ }
+ e2 = 0;
+ }
+ } else {
+ shunget(f);
+ }
+ e2 += 4*rp - 32;
+
+ if (!x) {
//return sign * 0.0;
return dbl_to_f128(sign * 0.0);
}
- if (e2 > -emin) {
- errno = ERANGE;
- //return sign * LDBL_MAX * LDBL_MAX;
- return zero;
- }
- if (e2 < emin-2*LDBL_MANT_DIG) {
- errno = ERANGE;
- //return sign * LDBL_MIN * LDBL_MIN;
- return zero;
- }
-
- while (x < 0x80000000) {
- //if (y>=0.5)
- if (!f128M_lt(&y, &point_5)) {
- x += x + 1;
- //y += y - 1;
+ if (e2 > -emin) {
+ errno = ERANGE;
+ //return sign * LDBL_MAX * LDBL_MAX;
+ return zero;
+ }
+ if (e2 < emin-2*LDBL_MANT_DIG) {
+ errno = ERANGE;
+ //return sign * LDBL_MIN * LDBL_MIN;
+ return zero;
+ }
+
+ while (x < 0x80000000) {
+ //if (y>=0.5)
+ if (!f128M_lt(&y, &point_5)) {
+ x += x + 1;
+ //y += y - 1;
{
float128_t minus_one;
f128M_sub(&y, &one, &minus_one);
@@ -878,33 +878,33 @@ static float128_t hexfloat(struct MuslFILE *f, int bits, int emin, int sign, int
f128M_add(&y, &minus_one, &new_y);
y = new_y;
}
- } else {
- x += x;
- //y += y;
+ } else {
+ x += x;
+ //y += y;
{
float128_t new_y;
f128M_add(&y, &y, &new_y);
y = new_y;
}
- }
- e2--;
- }
+ }
+ e2--;
+ }
- if (bits > 32+e2-emin) {
- bits = 32+e2-emin;
- if (bits<0) bits=0;
- }
+ if (bits > 32+e2-emin) {
+ bits = 32+e2-emin;
+ if (bits<0) bits=0;
+ }
- if (bits < LDBL_MANT_DIG) {
+ if (bits < LDBL_MANT_DIG) {
float128_t sign_f128;
i32_to_f128M(sign, &sign_f128);
- bias = copysignf128(dbl_to_f128(scalbn(1, 32+LDBL_MANT_DIG-bits-1)), sign_f128);
+ bias = copysignf128(dbl_to_f128(scalbn(1, 32+LDBL_MANT_DIG-bits-1)), sign_f128);
}
- //if (bits<32 && y && !(x&1)) x++, y=0;
- if (bits<32 && !f128M_eq(&y, &zero) && !(x&1)) x++, y=zero;
+ //if (bits<32 && y && !(x&1)) x++, y=0;
+ if (bits<32 && !f128M_eq(&y, &zero) && !(x&1)) x++, y=zero;
- //y = bias + sign*(float128_t)x + sign*y;
+ //y = bias + sign*(float128_t)x + sign*y;
{
float128_t x_f128;
ui32_to_f128M(x, &x_f128);
@@ -920,25 +920,25 @@ static float128_t hexfloat(struct MuslFILE *f, int bits, int emin, int sign, int
f128M_add(&bias_op, &sign_mul_y, &new_y);
y = new_y;
}
- //y -= bias;
+ //y -= bias;
{
float128_t new_y;
f128M_sub(&y, &bias, &new_y);
y = new_y;
}
- if (f128M_eq(&y, &zero)) errno = ERANGE;
+ if (f128M_eq(&y, &zero)) errno = ERANGE;
- return scalbnf128(y, e2);
+ return scalbnf128(y, e2);
}
static int isspace(int c)
{
- return c == ' ' || (unsigned)c-'\t' < 5;
+ return c == ' ' || (unsigned)c-'\t' < 5;
}
static inline float128_t makeInf128() {
- union ldshape ux;
+ union ldshape ux;
ux.i2.hi = 0x7fff000000000000UL;
ux.i2.lo = 0x0UL;
return ux.f;
@@ -946,7 +946,7 @@ static inline float128_t makeInf128() {
static inline float128_t makeNaN128() {
uint64_t rand = 0UL;
- union ldshape ux;
+ union ldshape ux;
ux.i2.hi = 0x7fff000000000000UL | (rand & 0xffffffffffffUL);
ux.i2.lo = 0x0UL;
return ux.f;
@@ -954,86 +954,86 @@ static inline float128_t makeNaN128() {
float128_t __floatscan(struct MuslFILE *f, int prec, int pok)
{
- int sign = 1;
- size_t i;
- int bits = LDBL_MANT_DIG;
- int emin = LDBL_MIN_EXP-bits;
- int c;
-
- while (isspace((c=shgetc(f))));
-
- if (c=='+' || c=='-') {
- sign -= 2*(c=='-');
- c = shgetc(f);
- }
-
- for (i=0; i<8 && (c|32)=="infinity"[i]; i++)
- if (i<7) c = shgetc(f);
- if (i==3 || i==8 || (i>3 && pok)) {
- if (i!=8) {
- shunget(f);
- if (pok) for (; i>3; i--) shunget(f);
- }
- //return sign * INFINITY;
+ int sign = 1;
+ size_t i;
+ int bits = LDBL_MANT_DIG;
+ int emin = LDBL_MIN_EXP-bits;
+ int c;
+
+ while (isspace((c=shgetc(f))));
+
+ if (c=='+' || c=='-') {
+ sign -= 2*(c=='-');
+ c = shgetc(f);
+ }
+
+ for (i=0; i<8 && (c|32)=="infinity"[i]; i++)
+ if (i<7) c = shgetc(f);
+ if (i==3 || i==8 || (i>3 && pok)) {
+ if (i!=8) {
+ shunget(f);
+ if (pok) for (; i>3; i--) shunget(f);
+ }
+ //return sign * INFINITY;
float128_t sign_f128;
i32_to_f128M(sign, &sign_f128);
float128_t infinity_f128 = makeInf128();
float128_t result;
f128M_mul(&sign_f128, &infinity_f128, &result);
return result;
- }
- if (!i) for (i=0; i<3 && (c|32)=="nan"[i]; i++)
- if (i<2) c = shgetc(f);
- if (i==3) {
- if (shgetc(f) != '(') {
- shunget(f);
- return makeNaN128();
- }
- for (i=1; ; i++) {
- c = shgetc(f);
- if (c-'0'<10U || c-'A'<26U || c-'a'<26U || c=='_')
- continue;
- if (c==')') return makeNaN128();
- shunget(f);
- if (!pok) {
- errno = EINVAL;
- shlim(f, 0);
+ }
+ if (!i) for (i=0; i<3 && (c|32)=="nan"[i]; i++)
+ if (i<2) c = shgetc(f);
+ if (i==3) {
+ if (shgetc(f) != '(') {
+ shunget(f);
+ return makeNaN128();
+ }
+ for (i=1; ; i++) {
+ c = shgetc(f);
+ if (c-'0'<10U || c-'A'<26U || c-'a'<26U || c=='_')
+ continue;
+ if (c==')') return makeNaN128();
+ shunget(f);
+ if (!pok) {
+ errno = EINVAL;
+ shlim(f, 0);
float128_t zero;
ui32_to_f128M(0, &zero);
- return zero;
- }
- while (i--) shunget(f);
- return makeNaN128();
- }
- return makeNaN128();
- }
-
- if (i) {
- shunget(f);
- errno = EINVAL;
- shlim(f, 0);
+ return zero;
+ }
+ while (i--) shunget(f);
+ return makeNaN128();
+ }
+ return makeNaN128();
+ }
+
+ if (i) {
+ shunget(f);
+ errno = EINVAL;
+ shlim(f, 0);
float128_t zero;
ui32_to_f128M(0, &zero);
- return zero;
- }
-
- if (c=='0') {
- c = shgetc(f);
- if ((c|32) == 'x')
- return hexfloat(f, bits, emin, sign, pok);
- shunget(f);
- c = '0';
- }
-
- return decfloat(f, c, bits, emin, sign, pok);
+ return zero;
+ }
+
+ if (c=='0') {
+ c = shgetc(f);
+ if ((c|32) == 'x')
+ return hexfloat(f, bits, emin, sign, pok);
+ shunget(f);
+ c = '0';
+ }
+
+ return decfloat(f, c, bits, emin, sign, pok);
}
float128_t parse_f128(const char *s, char **p) {
- struct MuslFILE f;
- sh_fromstring(&f, s);
- shlim(&f, 0);
- float128_t y = __floatscan(&f, 2, 1);
- off_t cnt = shcnt(&f);
- if (p) *p = cnt ? (char *)s + cnt : (char *)s;
- return y;
+ struct MuslFILE f;
+ sh_fromstring(&f, s);
+ shlim(&f, 0);
+ float128_t y = __floatscan(&f, 2, 1);
+ off_t cnt = shcnt(&f);
+ if (p) *p = cnt ? (char *)s + cnt : (char *)s;
+ return y;
}