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authorSiddhesh Poyarekar <siddhesh@redhat.com>2013-02-27 11:28:20 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2013-02-27 11:28:20 +0530
commit09c14ed23ec3c5993f0572ca7887fe9ffedf83f8 (patch)
tree6836c33a8dfbac457cccd7e99c3f2792f672c311 /sysdeps/ieee754
parenta688864eed638ec0004f7271918882c8827b7506 (diff)
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Format mpsqrt.c
Diffstat (limited to 'sysdeps/ieee754')
-rw-r--r--sysdeps/ieee754/dbl-64/mpsqrt.c78
1 files changed, 44 insertions, 34 deletions
diff --git a/sysdeps/ieee754/dbl-64/mpsqrt.c b/sysdeps/ieee754/dbl-64/mpsqrt.c
index 941a4e9cd2..71ef5ce776 100644
--- a/sysdeps/ieee754/dbl-64/mpsqrt.c
+++ b/sysdeps/ieee754/dbl-64/mpsqrt.c
@@ -45,33 +45,37 @@
/* p as integer. Routine computes sqrt(*x) and stores result in *y */
/****************************************************************************/
-static double fastiroot(double);
+static double fastiroot (double);
void
SECTION
-__mpsqrt(mp_no *x, mp_no *y, int p) {
- int i,m,ey;
- double dx,dy;
- static const mp_no
- mphalf = {0,{1.0,8388608.0 /* 2^23 */}},
- mp3halfs = {1,{1.0,1.0,8388608.0 /* 2^23 */}};
- mp_no mpxn,mpz,mpu,mpt1,mpt2;
+__mpsqrt (mp_no *x, mp_no *y, int p)
+{
+ int i, m, ey;
+ double dx, dy;
+ static const mp_no mphalf = {0, {1.0, 8388608.0 /* 2^23 */}};
+ static const mp_no mp3halfs = {1, {1.0, 1.0, 8388608.0 /* 2^23 */}};
+ mp_no mpxn, mpz, mpu, mpt1, mpt2;
- ey=EX/2; __cpy(x,&mpxn,p); mpxn.e -= (ey+ey);
- __mp_dbl(&mpxn,&dx,p); dy=fastiroot(dx); __dbl_mp(dy,&mpu,p);
- __mul(&mpxn,&mphalf,&mpz,p);
+ ey = EX / 2;
+ __cpy (x, &mpxn, p);
+ mpxn.e -= (ey + ey);
+ __mp_dbl (&mpxn, &dx, p);
+ dy = fastiroot (dx);
+ __dbl_mp (dy, &mpu, p);
+ __mul (&mpxn, &mphalf, &mpz, p);
- m=__mpsqrt_mp[p];
- for (i=0; i<m; i++) {
- __sqr(&mpu,&mpt1,p);
- __mul(&mpt1,&mpz,&mpt2,p);
- __sub(&mp3halfs,&mpt2,&mpt1,p);
- __mul(&mpu,&mpt1,&mpt2,p);
- __cpy(&mpt2,&mpu,p);
- }
- __mul(&mpxn,&mpu,y,p); EY += ey;
-
- return;
+ m = __mpsqrt_mp[p];
+ for (i = 0; i < m; i++)
+ {
+ __sqr (&mpu, &mpt1, p);
+ __mul (&mpt1, &mpz, &mpt2, p);
+ __sub (&mp3halfs, &mpt2, &mpt1, p);
+ __mul (&mpu, &mpt1, &mpt2, p);
+ __cpy (&mpt2, &mpu, p);
+ }
+ __mul (&mpxn, &mpu, y, p);
+ EY += ey;
}
/***********************************************************/
@@ -80,22 +84,28 @@ __mpsqrt(mp_no *x, mp_no *y, int p) {
/***********************************************************/
static double
SECTION
-fastiroot(double x) {
- union {int i[2]; double d;} p,q;
- double y,z, t;
+fastiroot (double x)
+{
+ union
+ {
+ int i[2];
+ double d;
+ } p, q;
+ double y, z, t;
int n;
- static const double c0 = 0.99674, c1 = -0.53380, c2 = 0.45472, c3 = -0.21553;
+ static const double c0 = 0.99674, c1 = -0.53380;
+ static const double c2 = 0.45472, c3 = -0.21553;
p.d = x;
- p.i[HIGH_HALF] = (p.i[HIGH_HALF] & 0x3FFFFFFF ) | 0x3FE00000 ;
+ p.i[HIGH_HALF] = (p.i[HIGH_HALF] & 0x3FFFFFFF) | 0x3FE00000;
q.d = x;
y = p.d;
- z = y -1.0;
- n = (q.i[HIGH_HALF] - p.i[HIGH_HALF])>>1;
- z = ((c3*z + c2)*z + c1)*z + c0; /* 2**-7 */
- z = z*(1.5 - 0.5*y*z*z); /* 2**-14 */
- p.d = z*(1.5 - 0.5*y*z*z); /* 2**-28 */
+ z = y - 1.0;
+ n = (q.i[HIGH_HALF] - p.i[HIGH_HALF]) >> 1;
+ z = ((c3 * z + c2) * z + c1) * z + c0; /* 2**-7 */
+ z = z * (1.5 - 0.5 * y * z * z); /* 2**-14 */
+ p.d = z * (1.5 - 0.5 * y * z * z); /* 2**-28 */
p.i[HIGH_HALF] -= n;
- t = x*p.d;
- return p.d*(1.5 - 0.5*p.d*t);
+ t = x * p.d;
+ return p.d * (1.5 - 0.5 * p.d * t);
}