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code cleanup of named constants

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zero, one, two, half are replaced by const literals
The policy was to use the f suffix for float consts (1.0f),
but don't use suffix for long double consts (these consts
can be exactly represented as double).
This commit is contained in:
nsz
2012-03-19 23:41:19 +01:00
parent b03255af77
commit 0cbb654791
73 changed files with 513 additions and 623 deletions
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57
src/math/erff.c
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@ -17,9 +17,6 @@
static const float
tiny = 1e-30,
half = 5.0000000000e-01, /* 0x3F000000 */
one = 1.0000000000e+00, /* 0x3F800000 */
two = 2.0000000000e+00, /* 0x40000000 */
/* c = (subfloat)0.84506291151 */
erx = 8.4506291151e-01, /* 0x3f58560b */
/*
@ -100,7 +97,7 @@ float erff(float x)
if (ix >= 0x7f800000) {
/* erf(nan)=nan, erf(+-inf)=+-1 */
i = ((uint32_t)hx>>31)<<1;
return (float)(1-i)+one/x;
return (float)(1-i)+1.0f/x;
}
if (ix < 0x3f580000) { /* |x| < 0.84375 */
if (ix < 0x31800000) { /* |x| < 2**-28 */
@ -111,42 +108,42 @@ float erff(float 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 = 1.0f+z*(qq1+z*(qq2+z*(qq3+z*(qq4+z*qq5))));
y = r/s;
return x + x*y;
}
if (ix < 0x3fa00000) { /* 0.84375 <= |x| < 1.25 */
s = fabsf(x)-one;
s = fabsf(x)-1.0f;
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 = 1.0f+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 >= 0x40c00000) { /* inf > |x| >= 6 */
if (hx >= 0)
return one - tiny;
return tiny - one;
return 1.0f - tiny;
return tiny - 1.0f;
}
x = fabsf(x);
s = one/(x*x);
s = 1.0f/(x*x);
if (ix < 0x4036DB6E) { /* |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 = 1.0f+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 = 1.0f+s*(sb1+s*(sb2+s*(sb3+s*(sb4+s*(
sb5+s*(sb6+s*sb7))))));
}
GET_FLOAT_WORD(ix, x);
SET_FLOAT_WORD(z, ix&0xfffff000);
r = expf(-z*z - 0.5625f) * expf((z-x)*(z+x) + R/S);
if (hx >= 0)
return one - r/x;
return r/x - one;
return 1.0f - r/x;
return r/x - 1.0f;
}
float erfcf(float x)
@ -158,50 +155,50 @@ float erfcf(float x)
ix = hx & 0x7fffffff;
if (ix >= 0x7f800000) {
/* erfc(nan)=nan, erfc(+-inf)=0,2 */
return (float)(((uint32_t)hx>>31)<<1) + one/x;
return (float)(((uint32_t)hx>>31)<<1) + 1.0f/x;
}
if (ix < 0x3f580000) { /* |x| < 0.84375 */
if (ix < 0x23800000) /* |x| < 2**-56 */
return one - x;
return 1.0f - 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 = 1.0f+z*(qq1+z*(qq2+z*(qq3+z*(qq4+z*qq5))));
y = r/s;
if (hx < 0x3e800000) { /* x<1/4 */
return one - (x+x*y);
return 1.0f - (x+x*y);
} else {
r = x*y;
r += (x-half);
return half - r ;
r += (x-0.5f);
return 0.5f - r ;
}
}
if (ix < 0x3fa00000) { /* 0.84375 <= |x| < 1.25 */
s = fabsf(x)-one;
s = fabsf(x)-1.0f;
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 = 1.0f+s*(qa1+s*(qa2+s*(qa3+s*(qa4+s*(qa5+s*qa6)))));
if(hx >= 0) {
z = one - erx;
z = 1.0f - erx;
return z - P/Q;
} else {
z = erx + P/Q;
return one + z;
return 1.0f + z;
}
}
if (ix < 0x41e00000) { /* |x| < 28 */
x = fabsf(x);
s = one/(x*x);
s = 1.0f/(x*x);
if (ix < 0x4036DB6D) { /* |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 = 1.0f+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 >= 0x40c00000) /* x < -6 */
return two-tiny;
return 2.0f-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 = 1.0f+s*(sb1+s*(sb2+s*(sb3+s*(sb4+s*(
sb5+s*(sb6+s*sb7))))));
}
GET_FLOAT_WORD(ix, x);
@ -209,9 +206,9 @@ float erfcf(float x)
r = expf(-z*z - 0.5625f) * expf((z-x)*(z+x) + R/S);
if (hx > 0)
return r/x;
return two - r/x;
return 2.0f - r/x;
}
if (hx > 0)
return tiny*tiny;
return two - tiny;
return 2.0f - tiny;
}