code cleanup of named constants

[musl] / src / math / erf.c

diff --git a/src/math/erf.c b/src/math/erf.c
index 18ee01c..dd8c3a7 100644 (file)
--- a/src/math/erf.c
+++ b/src/math/erf.c
@@ -107,9 +107,6 @@
 
 static const double
 tiny = 1e-300,
-half = 5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */
-one  = 1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */
-two  = 2.00000000000000000000e+00, /* 0x40000000, 0x00000000 */
 /* c = (float)0.84506291151 */
 erx  = 8.45062911510467529297e-01, /* 0x3FEB0AC1, 0x60000000 */
 /*
@@ -190,7 +187,7 @@ double erf(double x)
        if (ix >= 0x7ff00000) {
                /* erf(nan)=nan, erf(+-inf)=+-1 */
                i = ((uint32_t)hx>>31)<<1;
-               return (double)(1-i) + one/x;
+               return (double)(1-i) + 1.0/x;
        }
        if (ix < 0x3feb0000) {  /* |x|<0.84375 */
                if (ix < 0x3e300000) {  /* |x|<2**-28 */
@@ -201,42 +198,42 @@ double erf(double x)
                }
                z = x*x;
                r = pp0+z*(pp1+z*(pp2+z*(pp3+z*pp4)));
-               s = one+z*(qq1+z*(qq2+z*(qq3+z*(qq4+z*qq5))));
+               s = 1.0+z*(qq1+z*(qq2+z*(qq3+z*(qq4+z*qq5))));
                y = r/s;
                return x + x*y;
        }
        if (ix < 0x3ff40000) {  /* 0.84375 <= |x| < 1.25 */
-               s = fabs(x)-one;
+               s = fabs(x)-1.0;
                P = pa0+s*(pa1+s*(pa2+s*(pa3+s*(pa4+s*(pa5+s*pa6)))));
-               Q = one+s*(qa1+s*(qa2+s*(qa3+s*(qa4+s*(qa5+s*qa6)))));
+               Q = 1.0+s*(qa1+s*(qa2+s*(qa3+s*(qa4+s*(qa5+s*qa6)))));
                if (hx >= 0)
                        return erx + P/Q;
                return -erx - P/Q;
        }
        if (ix >= 0x40180000) {  /* inf > |x| >= 6 */
                if (hx >= 0)
-                       return one-tiny;
-               return tiny-one;
+                       return 1.0 - tiny;
+               return tiny - 1.0;
        }
        x = fabs(x);
-       s = one/(x*x);
+       s = 1.0/(x*x);
        if (ix < 0x4006DB6E) {  /* |x| < 1/0.35 */
                R = ra0+s*(ra1+s*(ra2+s*(ra3+s*(ra4+s*(
                     ra5+s*(ra6+s*ra7))))));
-               S = one+s*(sa1+s*(sa2+s*(sa3+s*(sa4+s*(
+               S = 1.0+s*(sa1+s*(sa2+s*(sa3+s*(sa4+s*(
                     sa5+s*(sa6+s*(sa7+s*sa8)))))));
        } else {                /* |x| >= 1/0.35 */
                R = rb0+s*(rb1+s*(rb2+s*(rb3+s*(rb4+s*(
                     rb5+s*rb6)))));
-               S = one+s*(sb1+s*(sb2+s*(sb3+s*(sb4+s*(
+               S = 1.0+s*(sb1+s*(sb2+s*(sb3+s*(sb4+s*(
                     sb5+s*(sb6+s*sb7))))));
        }
        z = x;
        SET_LOW_WORD(z,0);
        r = exp(-z*z-0.5625)*exp((z-x)*(z+x)+R/S);
        if (hx >= 0)
-               return one-r/x;
-       return r/x-one;
+               return 1.0 - r/x;
+       return r/x - 1.0;
 }
 
 double erfc(double x)
@@ -248,49 +245,49 @@ double erfc(double x)
        ix = hx & 0x7fffffff;
        if (ix >= 0x7ff00000) {
                /* erfc(nan)=nan, erfc(+-inf)=0,2 */
-               return (double)(((uint32_t)hx>>31)<<1) + one/x;
+               return (double)(((uint32_t)hx>>31)<<1) + 1.0/x;
        }
        if (ix < 0x3feb0000) {  /* |x| < 0.84375 */
                if (ix < 0x3c700000)  /* |x| < 2**-56 */
-                       return one - x;
+                       return 1.0 - x;
                z = x*x;
                r = pp0+z*(pp1+z*(pp2+z*(pp3+z*pp4)));
-               s = one+z*(qq1+z*(qq2+z*(qq3+z*(qq4+z*qq5))));
+               s = 1.0+z*(qq1+z*(qq2+z*(qq3+z*(qq4+z*qq5))));
                y = r/s;
                if (hx < 0x3fd00000) {  /* x < 1/4 */
-                       return one - (x+x*y);
+                       return 1.0 - (x+x*y);
                } else {
                        r = x*y;
-                       r += x-half;
-                       return half - r ;
+                       r += x - 0.5;
+                       return 0.5 - r ;
                }
        }
        if (ix < 0x3ff40000) {  /* 0.84375 <= |x| < 1.25 */
-               s = fabs(x)-one;
+               s = fabs(x)-1.0;
                P = pa0+s*(pa1+s*(pa2+s*(pa3+s*(pa4+s*(pa5+s*pa6)))));
-               Q = one+s*(qa1+s*(qa2+s*(qa3+s*(qa4+s*(qa5+s*qa6)))));
+               Q = 1.0+s*(qa1+s*(qa2+s*(qa3+s*(qa4+s*(qa5+s*qa6)))));
                if (hx >= 0) {
-                       z = one-erx;
+                       z = 1.0-erx;
                        return z - P/Q;
                } else {
                        z = erx+P/Q;
-                       return one+z;
+                       return 1.0 + z;
                }
        }
        if (ix < 0x403c0000) {  /* |x| < 28 */
                x = fabs(x);
-               s = one/(x*x);
+               s = 1.0/(x*x);
                if (ix < 0x4006DB6D) {  /* |x| < 1/.35 ~ 2.857143*/
                        R = ra0+s*(ra1+s*(ra2+s*(ra3+s*(ra4+s*(
                             ra5+s*(ra6+s*ra7))))));
-                       S = one+s*(sa1+s*(sa2+s*(sa3+s*(sa4+s*(
+                       S = 1.0+s*(sa1+s*(sa2+s*(sa3+s*(sa4+s*(
                             sa5+s*(sa6+s*(sa7+s*sa8)))))));
                } else {                /* |x| >= 1/.35 ~ 2.857143 */
                        if (hx < 0 && ix >= 0x40180000)  /* x < -6 */
-                               return two-tiny;
+                               return 2.0 - tiny;
                        R = rb0+s*(rb1+s*(rb2+s*(rb3+s*(rb4+s*(
                             rb5+s*rb6)))));
-                       S = one+s*(sb1+s*(sb2+s*(sb3+s*(sb4+s*(
+                       S = 1.0+s*(sb1+s*(sb2+s*(sb3+s*(sb4+s*(
                             sb5+s*(sb6+s*sb7))))));
                }
                z = x;
@@ -298,9 +295,9 @@ double erfc(double x)
                r = exp(-z*z-0.5625)*exp((z-x)*(z+x)+R/S);
                if (hx > 0)
                        return r/x;
-               return two-r/x;
+               return 2.0 - r/x;
        }
        if (hx > 0)
                return tiny*tiny;
-       return two-tiny;
+       return 2.0 - tiny;
 }