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Unified Diff: fusl/src/math/sqrt.c

Issue 1714623002: [fusl] clang-format fusl (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: headers too Created 4 years, 10 months ago
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Index: fusl/src/math/sqrt.c
diff --git a/fusl/src/math/sqrt.c b/fusl/src/math/sqrt.c
index b27756738595dc29a8a7f35e7bffa8da64214826..ff184fa7f08787e47cf524d5dbf066c6103d321e 100644
--- a/fusl/src/math/sqrt.c
+++ b/fusl/src/math/sqrt.c
@@ -80,106 +80,105 @@
static const double tiny = 1.0e-300;
-double sqrt(double x)
-{
- double z;
- int32_t sign = (int)0x80000000;
- int32_t ix0,s0,q,m,t,i;
- uint32_t r,t1,s1,ix1,q1;
+double sqrt(double x) {
+ double z;
+ int32_t sign = (int)0x80000000;
+ int32_t ix0, s0, q, m, t, i;
+ uint32_t r, t1, s1, ix1, q1;
- EXTRACT_WORDS(ix0, ix1, x);
+ EXTRACT_WORDS(ix0, ix1, x);
- /* take care of Inf and NaN */
- if ((ix0&0x7ff00000) == 0x7ff00000) {
- return x*x + x; /* sqrt(NaN)=NaN, sqrt(+inf)=+inf, sqrt(-inf)=sNaN */
- }
- /* take care of zero */
- if (ix0 <= 0) {
- if (((ix0&~sign)|ix1) == 0)
- return x; /* sqrt(+-0) = +-0 */
- if (ix0 < 0)
- return (x-x)/(x-x); /* sqrt(-ve) = sNaN */
- }
- /* normalize x */
- m = ix0>>20;
- if (m == 0) { /* subnormal x */
- while (ix0 == 0) {
- m -= 21;
- ix0 |= (ix1>>11);
- ix1 <<= 21;
- }
- for (i=0; (ix0&0x00100000) == 0; i++)
- ix0<<=1;
- m -= i - 1;
- ix0 |= ix1>>(32-i);
- ix1 <<= i;
- }
- m -= 1023; /* unbias exponent */
- ix0 = (ix0&0x000fffff)|0x00100000;
- if (m & 1) { /* odd m, double x to make it even */
- ix0 += ix0 + ((ix1&sign)>>31);
- ix1 += ix1;
- }
- m >>= 1; /* m = [m/2] */
+ /* take care of Inf and NaN */
+ if ((ix0 & 0x7ff00000) == 0x7ff00000) {
+ return x * x + x; /* sqrt(NaN)=NaN, sqrt(+inf)=+inf, sqrt(-inf)=sNaN */
+ }
+ /* take care of zero */
+ if (ix0 <= 0) {
+ if (((ix0 & ~sign) | ix1) == 0)
+ return x; /* sqrt(+-0) = +-0 */
+ if (ix0 < 0)
+ return (x - x) / (x - x); /* sqrt(-ve) = sNaN */
+ }
+ /* normalize x */
+ m = ix0 >> 20;
+ if (m == 0) { /* subnormal x */
+ while (ix0 == 0) {
+ m -= 21;
+ ix0 |= (ix1 >> 11);
+ ix1 <<= 21;
+ }
+ for (i = 0; (ix0 & 0x00100000) == 0; i++)
+ ix0 <<= 1;
+ m -= i - 1;
+ ix0 |= ix1 >> (32 - i);
+ ix1 <<= i;
+ }
+ m -= 1023; /* unbias exponent */
+ ix0 = (ix0 & 0x000fffff) | 0x00100000;
+ if (m & 1) { /* odd m, double x to make it even */
+ ix0 += ix0 + ((ix1 & sign) >> 31);
+ ix1 += ix1;
+ }
+ m >>= 1; /* m = [m/2] */
- /* generate sqrt(x) bit by bit */
- ix0 += ix0 + ((ix1&sign)>>31);
- ix1 += ix1;
- q = q1 = s0 = s1 = 0; /* [q,q1] = sqrt(x) */
- r = 0x00200000; /* r = moving bit from right to left */
+ /* generate sqrt(x) bit by bit */
+ ix0 += ix0 + ((ix1 & sign) >> 31);
+ ix1 += ix1;
+ q = q1 = s0 = s1 = 0; /* [q,q1] = sqrt(x) */
+ r = 0x00200000; /* r = moving bit from right to left */
- while (r != 0) {
- t = s0 + r;
- if (t <= ix0) {
- s0 = t + r;
- ix0 -= t;
- q += r;
- }
- ix0 += ix0 + ((ix1&sign)>>31);
- ix1 += ix1;
- r >>= 1;
- }
+ while (r != 0) {
+ t = s0 + r;
+ if (t <= ix0) {
+ s0 = t + r;
+ ix0 -= t;
+ q += r;
+ }
+ ix0 += ix0 + ((ix1 & sign) >> 31);
+ ix1 += ix1;
+ r >>= 1;
+ }
- r = sign;
- while (r != 0) {
- t1 = s1 + r;
- t = s0;
- if (t < ix0 || (t == ix0 && t1 <= ix1)) {
- s1 = t1 + r;
- if ((t1&sign) == sign && (s1&sign) == 0)
- s0++;
- ix0 -= t;
- if (ix1 < t1)
- ix0--;
- ix1 -= t1;
- q1 += r;
- }
- ix0 += ix0 + ((ix1&sign)>>31);
- ix1 += ix1;
- r >>= 1;
- }
+ r = sign;
+ while (r != 0) {
+ t1 = s1 + r;
+ t = s0;
+ if (t < ix0 || (t == ix0 && t1 <= ix1)) {
+ s1 = t1 + r;
+ if ((t1 & sign) == sign && (s1 & sign) == 0)
+ s0++;
+ ix0 -= t;
+ if (ix1 < t1)
+ ix0--;
+ ix1 -= t1;
+ q1 += r;
+ }
+ ix0 += ix0 + ((ix1 & sign) >> 31);
+ ix1 += ix1;
+ r >>= 1;
+ }
- /* use floating add to find out rounding direction */
- if ((ix0|ix1) != 0) {
- z = 1.0 - tiny; /* raise inexact flag */
- if (z >= 1.0) {
- z = 1.0 + tiny;
- if (q1 == (uint32_t)0xffffffff) {
- q1 = 0;
- q++;
- } else if (z > 1.0) {
- if (q1 == (uint32_t)0xfffffffe)
- q++;
- q1 += 2;
- } else
- q1 += q1 & 1;
- }
- }
- ix0 = (q>>1) + 0x3fe00000;
- ix1 = q1>>1;
- if (q&1)
- ix1 |= sign;
- ix0 += m << 20;
- INSERT_WORDS(z, ix0, ix1);
- return z;
+ /* use floating add to find out rounding direction */
+ if ((ix0 | ix1) != 0) {
+ z = 1.0 - tiny; /* raise inexact flag */
+ if (z >= 1.0) {
+ z = 1.0 + tiny;
+ if (q1 == (uint32_t)0xffffffff) {
+ q1 = 0;
+ q++;
+ } else if (z > 1.0) {
+ if (q1 == (uint32_t)0xfffffffe)
+ q++;
+ q1 += 2;
+ } else
+ q1 += q1 & 1;
+ }
+ }
+ ix0 = (q >> 1) + 0x3fe00000;
+ ix1 = q1 >> 1;
+ if (q & 1)
+ ix1 |= sign;
+ ix0 += m << 20;
+ INSERT_WORDS(z, ix0, ix1);
+ return z;
}

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