Chromium Code Reviews
chromiumcodereview-hr@appspot.gserviceaccount.com (chromiumcodereview-hr) | Please choose your nickname with Settings | Help | Chromium Project | Gerrit Changes | Sign out
(319)

Unified Diff: fusl/src/math/log1pf.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
Use n/p to move between diff chunks; N/P to move between comments. Draft comments are only viewable by you.
Jump to:
View side-by-side diff with in-line comments
Download patch
Index: fusl/src/math/log1pf.c
diff --git a/fusl/src/math/log1pf.c b/fusl/src/math/log1pf.c
index 23985c35675842d925bbc3c1475bd419926e0fda..e50ad823ae6e6aa5a1c946c11374fc22f5951cb0 100644
--- a/fusl/src/math/log1pf.c
+++ b/fusl/src/math/log1pf.c
@@ -12,66 +12,67 @@
#include "libm.h"
-static const float
-ln2_hi = 6.9313812256e-01, /* 0x3f317180 */
-ln2_lo = 9.0580006145e-06, /* 0x3717f7d1 */
-/* |(log(1+s)-log(1-s))/s - Lg(s)| < 2**-34.24 (~[-4.95e-11, 4.97e-11]). */
-Lg1 = 0xaaaaaa.0p-24, /* 0.66666662693 */
-Lg2 = 0xccce13.0p-25, /* 0.40000972152 */
-Lg3 = 0x91e9ee.0p-25, /* 0.28498786688 */
-Lg4 = 0xf89e26.0p-26; /* 0.24279078841 */
+static const float ln2_hi = 6.9313812256e-01, /* 0x3f317180 */
+ ln2_lo = 9.0580006145e-06, /* 0x3717f7d1 */
+ /* |(log(1+s)-log(1-s))/s - Lg(s)| < 2**-34.24 (~[-4.95e-11, 4.97e-11]). */
+ Lg1 = 0xaaaaaa.0p-24, /* 0.66666662693 */
+ Lg2 = 0xccce13.0p-25, /* 0.40000972152 */
+ Lg3 = 0x91e9ee.0p-25, /* 0.28498786688 */
+ Lg4 = 0xf89e26.0p-26; /* 0.24279078841 */
-float log1pf(float x)
-{
- union {float f; uint32_t i;} u = {x};
- float_t hfsq,f,c,s,z,R,w,t1,t2,dk;
- uint32_t ix,iu;
- int k;
+float log1pf(float x) {
+ union {
+ float f;
+ uint32_t i;
+ } u = {x};
+ float_t hfsq, f, c, s, z, R, w, t1, t2, dk;
+ uint32_t ix, iu;
+ int k;
- ix = u.i;
- k = 1;
- if (ix < 0x3ed413d0 || ix>>31) { /* 1+x < sqrt(2)+ */
- if (ix >= 0xbf800000) { /* x <= -1.0 */
- if (x == -1)
- return x/0.0f; /* log1p(-1)=+inf */
- return (x-x)/0.0f; /* log1p(x<-1)=NaN */
- }
- if (ix<<1 < 0x33800000<<1) { /* |x| < 2**-24 */
- /* underflow if subnormal */
- if ((ix&0x7f800000) == 0)
- FORCE_EVAL(x*x);
- return x;
- }
- if (ix <= 0xbe95f619) { /* sqrt(2)/2- <= 1+x < sqrt(2)+ */
- k = 0;
- c = 0;
- f = x;
- }
- } else if (ix >= 0x7f800000)
- return x;
- if (k) {
- u.f = 1 + x;
- iu = u.i;
- iu += 0x3f800000 - 0x3f3504f3;
- k = (int)(iu>>23) - 0x7f;
- /* correction term ~ log(1+x)-log(u), avoid underflow in c/u */
- if (k < 25) {
- 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)] */
- iu = (iu&0x007fffff) + 0x3f3504f3;
- u.i = iu;
- f = u.f - 1;
- }
- s = f/(2.0f + f);
- z = s*s;
- w = z*z;
- t1= w*(Lg2+w*Lg4);
- t2= z*(Lg1+w*Lg3);
- R = t2 + t1;
- hfsq = 0.5f*f*f;
- dk = k;
- return s*(hfsq+R) + (dk*ln2_lo+c) - hfsq + f + dk*ln2_hi;
+ ix = u.i;
+ k = 1;
+ if (ix < 0x3ed413d0 || ix >> 31) { /* 1+x < sqrt(2)+ */
+ if (ix >= 0xbf800000) { /* x <= -1.0 */
+ if (x == -1)
+ return x / 0.0f; /* log1p(-1)=+inf */
+ return (x - x) / 0.0f; /* log1p(x<-1)=NaN */
+ }
+ if (ix << 1 < 0x33800000 << 1) { /* |x| < 2**-24 */
+ /* underflow if subnormal */
+ if ((ix & 0x7f800000) == 0)
+ FORCE_EVAL(x * x);
+ return x;
+ }
+ if (ix <= 0xbe95f619) { /* sqrt(2)/2- <= 1+x < sqrt(2)+ */
+ k = 0;
+ c = 0;
+ f = x;
+ }
+ } else if (ix >= 0x7f800000)
+ return x;
+ if (k) {
+ u.f = 1 + x;
+ iu = u.i;
+ iu += 0x3f800000 - 0x3f3504f3;
+ k = (int)(iu >> 23) - 0x7f;
+ /* correction term ~ log(1+x)-log(u), avoid underflow in c/u */
+ if (k < 25) {
+ 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)] */
+ iu = (iu & 0x007fffff) + 0x3f3504f3;
+ u.i = iu;
+ f = u.f - 1;
+ }
+ s = f / (2.0f + f);
+ z = s * s;
+ w = z * z;
+ t1 = w * (Lg2 + w * Lg4);
+ t2 = z * (Lg1 + w * Lg3);
+ R = t2 + t1;
+ hfsq = 0.5f * f * f;
+ dk = k;
+ return s * (hfsq + R) + (dk * ln2_lo + c) - hfsq + f + dk * ln2_hi;
}

Powered by Google App Engine
This is Rietveld 408576698