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Unified Diff: fusl/src/math/log1p.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/log1p.c
diff --git a/fusl/src/math/log1p.c b/fusl/src/math/log1p.c
index 0097134940378136f861708e6b952a8d67f76b3c..0fac0ca24503d4eb29d7e8c0d324339ba412acc7 100644
--- a/fusl/src/math/log1p.c
+++ b/fusl/src/math/log1p.c
@@ -55,68 +55,69 @@
#include "libm.h"
-static const double
-ln2_hi = 6.93147180369123816490e-01, /* 3fe62e42 fee00000 */
-ln2_lo = 1.90821492927058770002e-10, /* 3dea39ef 35793c76 */
-Lg1 = 6.666666666666735130e-01, /* 3FE55555 55555593 */
-Lg2 = 3.999999999940941908e-01, /* 3FD99999 9997FA04 */
-Lg3 = 2.857142874366239149e-01, /* 3FD24924 94229359 */
-Lg4 = 2.222219843214978396e-01, /* 3FCC71C5 1D8E78AF */
-Lg5 = 1.818357216161805012e-01, /* 3FC74664 96CB03DE */
-Lg6 = 1.531383769920937332e-01, /* 3FC39A09 D078C69F */
-Lg7 = 1.479819860511658591e-01; /* 3FC2F112 DF3E5244 */
+static const double ln2_hi = 6.93147180369123816490e-01, /* 3fe62e42 fee00000 */
+ ln2_lo = 1.90821492927058770002e-10, /* 3dea39ef 35793c76 */
+ Lg1 = 6.666666666666735130e-01, /* 3FE55555 55555593 */
+ Lg2 = 3.999999999940941908e-01, /* 3FD99999 9997FA04 */
+ Lg3 = 2.857142874366239149e-01, /* 3FD24924 94229359 */
+ Lg4 = 2.222219843214978396e-01, /* 3FCC71C5 1D8E78AF */
+ Lg5 = 1.818357216161805012e-01, /* 3FC74664 96CB03DE */
+ Lg6 = 1.531383769920937332e-01, /* 3FC39A09 D078C69F */
+ Lg7 = 1.479819860511658591e-01; /* 3FC2F112 DF3E5244 */
-double log1p(double x)
-{
- union {double f; uint64_t i;} u = {x};
- double_t hfsq,f,c,s,z,R,w,t1,t2,dk;
- uint32_t hx,hu;
- int k;
+double log1p(double x) {
+ union {
+ double f;
+ uint64_t i;
+ } u = {x};
+ double_t hfsq, f, c, s, z, R, w, t1, t2, dk;
+ uint32_t hx, hu;
+ int k;
- hx = u.i>>32;
- k = 1;
- if (hx < 0x3fda827a || hx>>31) { /* 1+x < sqrt(2)+ */
- if (hx >= 0xbff00000) { /* x <= -1.0 */
- if (x == -1)
- return x/0.0; /* log1p(-1) = -inf */
- return (x-x)/0.0; /* log1p(x<-1) = NaN */
- }
- if (hx<<1 < 0x3ca00000<<1) { /* |x| < 2**-53 */
- /* underflow if subnormal */
- if ((hx&0x7ff00000) == 0)
- FORCE_EVAL((float)x);
- return x;
- }
- if (hx <= 0xbfd2bec4) { /* sqrt(2)/2- <= 1+x < sqrt(2)+ */
- k = 0;
- c = 0;
- f = x;
- }
- } else if (hx >= 0x7ff00000)
- return x;
- if (k) {
- u.f = 1 + x;
- hu = u.i>>32;
- hu += 0x3ff00000 - 0x3fe6a09e;
- k = (int)(hu>>20) - 0x3ff;
- /* correction term ~ log(1+x)-log(u), avoid underflow in c/u */
- if (k < 54) {
- c = k >= 2 ? 1-(u.f-x) : x-(u.f-1);
- c /= u.f;
- } else
- c = 0;
- /* reduce u into [sqrt(2)/2, sqrt(2)] */
- hu = (hu&0x000fffff) + 0x3fe6a09e;
- u.i = (uint64_t)hu<<32 | (u.i&0xffffffff);
- f = u.f - 1;
- }
- hfsq = 0.5*f*f;
- s = f/(2.0+f);
- z = s*s;
- w = z*z;
- t1 = w*(Lg2+w*(Lg4+w*Lg6));
- t2 = z*(Lg1+w*(Lg3+w*(Lg5+w*Lg7)));
- R = t2 + t1;
- dk = k;
- return s*(hfsq+R) + (dk*ln2_lo+c) - hfsq + f + dk*ln2_hi;
+ hx = u.i >> 32;
+ k = 1;
+ if (hx < 0x3fda827a || hx >> 31) { /* 1+x < sqrt(2)+ */
+ if (hx >= 0xbff00000) { /* x <= -1.0 */
+ if (x == -1)
+ return x / 0.0; /* log1p(-1) = -inf */
+ return (x - x) / 0.0; /* log1p(x<-1) = NaN */
+ }
+ if (hx << 1 < 0x3ca00000 << 1) { /* |x| < 2**-53 */
+ /* underflow if subnormal */
+ if ((hx & 0x7ff00000) == 0)
+ FORCE_EVAL((float)x);
+ return x;
+ }
+ if (hx <= 0xbfd2bec4) { /* sqrt(2)/2- <= 1+x < sqrt(2)+ */
+ k = 0;
+ c = 0;
+ f = x;
+ }
+ } else if (hx >= 0x7ff00000)
+ return x;
+ if (k) {
+ u.f = 1 + x;
+ hu = u.i >> 32;
+ hu += 0x3ff00000 - 0x3fe6a09e;
+ k = (int)(hu >> 20) - 0x3ff;
+ /* correction term ~ log(1+x)-log(u), avoid underflow in c/u */
+ if (k < 54) {
+ c = k >= 2 ? 1 - (u.f - x) : x - (u.f - 1);
+ c /= u.f;
+ } else
+ c = 0;
+ /* reduce u into [sqrt(2)/2, sqrt(2)] */
+ hu = (hu & 0x000fffff) + 0x3fe6a09e;
+ u.i = (uint64_t)hu << 32 | (u.i & 0xffffffff);
+ f = u.f - 1;
+ }
+ hfsq = 0.5 * f * f;
+ s = f / (2.0 + f);
+ z = s * s;
+ w = z * z;
+ t1 = w * (Lg2 + w * (Lg4 + w * Lg6));
+ t2 = z * (Lg1 + w * (Lg3 + w * (Lg5 + w * Lg7)));
+ R = t2 + t1;
+ dk = k;
+ return s * (hfsq + R) + (dk * ln2_lo + c) - hfsq + f + dk * ln2_hi;
}

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