[cmucl-commit] [git] CMU Common Lisp branch master updated. snapshot-2014-06-40-ge0b1f9f

Raymond Toy rtoy at common-lisp.net
Sat Aug 2 02:31:53 UTC 2014


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- Log -----------------------------------------------------------------
commit e0b1f9f8b2142397cbf4ea76dd3ba862862baa49
Author: Raymond Toy <toy.raymond at gmail.com>
Date:   Fri Aug 1 19:31:39 2014 -0700

    Compile s_log1p and s_expm1.

diff --git a/src/lisp/Config.x86_darwin b/src/lisp/Config.x86_darwin
index 3dcdc61..70c2df4 100644
--- a/src/lisp/Config.x86_darwin
+++ b/src/lisp/Config.x86_darwin
@@ -18,7 +18,7 @@ OS_LIBS =
 
 EXEC_FINAL_OBJ = exec-final.o
 
-OS_SRC += k_sin.c k_cos.c k_tan.c s_sin.c s_cos.c s_tan.c sincos.c
+OS_SRC += k_sin.c k_cos.c k_tan.c s_sin.c s_cos.c s_tan.c sincos.c s_log1p.c s_expm1.c
 
 k_sin.o : k_sin.c
 	$(CC) -c $(CFLAGS) $(CPPFLAGS) $(CC_REM_PIO2) $<
@@ -37,3 +37,7 @@ s_tan.o : s_tan.c
 sincos.o : sincos.c
 	$(CC) -c $(CFLAGS) $(CPPFLAGS) $(CC_REM_PIO2) $<
 
+s_log1p.o : s_log1p.c
+	$(CC) -c $(CFLAGS) $(CPPFLAGS) $(CC_REM_PIO2) $<
+s_exmp1.o : s_expm1.c
+	$(CC) -c $(CFLAGS) $(CPPFLAGS) $(CC_REM_PIO2) $<

commit e19642f9bb877846f2fa05701bebcef1073821f3
Author: Raymond Toy <toy.raymond at gmail.com>
Date:   Fri Aug 1 19:30:45 2014 -0700

    Modify to use unions and change name to include fdlibm prefix.

diff --git a/src/lisp/s_expm1.c b/src/lisp/s_expm1.c
index e4dd820..d6a1827 100644
--- a/src/lisp/s_expm1.c
+++ b/src/lisp/s_expm1.c
@@ -127,17 +127,20 @@ Q4  =   4.00821782732936239552e-06, /* 3ED0CFCA 86E65239 */
 Q5  =  -2.01099218183624371326e-07; /* BE8AFDB7 6E09C32D */
 
 #ifdef __STDC__
-	double expm1(double x)
+	double fdlibm_expm1(double x)
 #else
-	double expm1(x)
+	double fdlibm_expm1(x)
 	double x;
 #endif
 {
 	double y,hi,lo,c,t,e,hxs,hfx,r1;
 	int k,xsb;
 	unsigned hx;
+	union { int i[2]; double d; } ux;
+	union { int i[2]; double d; } utmp;
 
-	hx  = __HI(x);	/* high word of x */
+	ux.d = x;
+	hx  = ux.i[HIWORD];	/* high word of x */
 	xsb = hx&0x80000000;		/* sign bit of x */
 	if(xsb==0) y=x; else y= -x;	/* y = |x| */
 	hx &= 0x7fffffff;		/* high word of |x| */
@@ -146,7 +149,7 @@ Q5  =  -2.01099218183624371326e-07; /* BE8AFDB7 6E09C32D */
 	if(hx >= 0x4043687A) {			/* if |x|>=56*ln2 */
 	    if(hx >= 0x40862E42) {		/* if |x|>=709.78... */
                 if(hx>=0x7ff00000) {
-		    if(((hx&0xfffff)|__LO(x))!=0) 
+		    if(((hx&0xfffff)|ux.i[LOWORD])!=0) 
 		         return x+x; 	 /* NaN */
 		    else return (xsb==0)? x:-1.0;/* exp(+-inf)={inf,-1} */
 	        }
@@ -196,19 +199,29 @@ Q5  =  -2.01099218183624371326e-07; /* BE8AFDB7 6E09C32D */
 	       	else 	      return  one+2.0*(x-e);
 	    if (k <= -2 || k>56) {   /* suffice to return exp(x)-1 */
 	        y = one-(e-x);
-	        __HI(y) += (k<<20);	/* add k to y's exponent */
+		utmp.d = y;
+	        utmp.i[HIWORD] += (k<<20);	/* add k to y's exponent */
+		y = utmp.d;
 	        return y-one;
 	    }
 	    t = one;
 	    if(k<20) {
-	       	__HI(t) = 0x3ff00000 - (0x200000>>k);  /* t=1-2^-k */
+		utmp.d = t;
+	       	utmp.i[HIWORD] = 0x3ff00000 - (0x200000>>k);  /* t=1-2^-k */
+		t = utmp.d;
 	       	y = t-(e-x);
-	       	__HI(y) += (k<<20);	/* add k to y's exponent */
+		utmp.d = y;
+	       	utmp.i[HIWORD] += (k<<20);	/* add k to y's exponent */
+		y = utmp.d;
 	   } else {
-	       	__HI(t)  = ((0x3ff-k)<<20);	/* 2^-k */
+		utmp.d = t;
+	       	utmp.i[HIWORD]  = ((0x3ff-k)<<20);	/* 2^-k */
+		t = utmp.d;
 	       	y = x-(e+t);
 	       	y += one;
-	       	__HI(y) += (k<<20);	/* add k to y's exponent */
+		utmp.d = y;
+	       	utmp.i[HIWORD] += (k<<20);	/* add k to y's exponent */
+		y = utmp.d;
 	    }
 	}
 	return y;
diff --git a/src/lisp/s_log1p.c b/src/lisp/s_log1p.c
index 3d1059a..eaec38a 100644
--- a/src/lisp/s_log1p.c
+++ b/src/lisp/s_log1p.c
@@ -97,16 +97,18 @@ Lp7 = 1.479819860511658591e-01;  /* 3FC2F112 DF3E5244 */
 static double zero = 0.0;
 
 #ifdef __STDC__
-	double log1p(double x)
+	double fdlibm_log1p(double x)
 #else
-	double log1p(x)
+	double fdlibm_log1p(x)
 	double x;
 #endif
 {
 	double hfsq,f,c,s,z,R,u;
 	int k,hx,hu,ax;
+	union { int i[2]; double d; } ux;
 
-	hx = __HI(x);		/* high word of x */
+	ux.d = x;
+	hx = ux.i[HIWORD];		/* high word of x */
 	ax = hx&0x7fffffff;
 
 	k = 1;
@@ -128,23 +130,29 @@ static double zero = 0.0;
 	if (hx >= 0x7ff00000) return x+x;
 	if(k!=0) {
 	    if(hx<0x43400000) {
-		u  = 1.0+x; 
-	        hu = __HI(u);		/* high word of u */
+		u  = 1.0+x;
+		ux.d = u;
+	        hu = ux.i[HIWORD];		/* high word of u */
 	        k  = (hu>>20)-1023;
 	        c  = (k>0)? 1.0-(u-x):x-(u-1.0);/* correction term */
 		c /= u;
 	    } else {
 		u  = x;
-	        hu = __HI(u);		/* high word of u */
+		ux.d = u;
+	        hu = ux.i[HIWORD];		/* high word of u */
 	        k  = (hu>>20)-1023;
 		c  = 0;
 	    }
 	    hu &= 0x000fffff;
 	    if(hu<0x6a09e) {
-	        __HI(u) = hu|0x3ff00000;	/* normalize u */
+		ux.d = u;
+	        ux.i[HIWORD] = hu|0x3ff00000;	/* normalize u */
+		u = ux.d;
 	    } else {
-	        k += 1; 
-	        __HI(u) = hu|0x3fe00000;	/* normalize u/2 */
+	        k += 1;
+		ux.d = u;
+	        ux.i[HIWORD] = hu|0x3fe00000;	/* normalize u/2 */
+		u = ux.d;
 	        hu = (0x00100000-hu)>>2;
 	    }
 	    f = u-1.0;

commit ae8eb31e7757d351eca8fd5b9693637843cda611
Author: Raymond Toy <toy.raymond at gmail.com>
Date:   Fri Aug 1 19:21:05 2014 -0700

    Import expm1 from fdlibm, as is.

diff --git a/src/lisp/s_expm1.c b/src/lisp/s_expm1.c
new file mode 100644
index 0000000..e4dd820
--- /dev/null
+++ b/src/lisp/s_expm1.c
@@ -0,0 +1,215 @@
+
+/* @(#)s_expm1.c 1.5 04/04/22 */
+/*
+ * ====================================================
+ * Copyright (C) 2004 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice 
+ * is preserved.
+ * ====================================================
+ */
+
+/* expm1(x)
+ * Returns exp(x)-1, the exponential of x minus 1.
+ *
+ * Method
+ *   1. Argument reduction:
+ *	Given x, find r and integer k such that
+ *
+ *               x = k*ln2 + r,  |r| <= 0.5*ln2 ~ 0.34658  
+ *
+ *      Here a correction term c will be computed to compensate 
+ *	the error in r when rounded to a floating-point number.
+ *
+ *   2. Approximating expm1(r) by a special rational function on
+ *	the interval [0,0.34658]:
+ *	Since
+ *	    r*(exp(r)+1)/(exp(r)-1) = 2+ r^2/6 - r^4/360 + ...
+ *	we define R1(r*r) by
+ *	    r*(exp(r)+1)/(exp(r)-1) = 2+ r^2/6 * R1(r*r)
+ *	That is,
+ *	    R1(r**2) = 6/r *((exp(r)+1)/(exp(r)-1) - 2/r)
+ *		     = 6/r * ( 1 + 2.0*(1/(exp(r)-1) - 1/r))
+ *		     = 1 - r^2/60 + r^4/2520 - r^6/100800 + ...
+ *      We use a special Remes algorithm on [0,0.347] to generate 
+ * 	a polynomial of degree 5 in r*r to approximate R1. The 
+ *	maximum error of this polynomial approximation is bounded 
+ *	by 2**-61. In other words,
+ *	    R1(z) ~ 1.0 + Q1*z + Q2*z**2 + Q3*z**3 + Q4*z**4 + Q5*z**5
+ *	where 	Q1  =  -1.6666666666666567384E-2,
+ * 		Q2  =   3.9682539681370365873E-4,
+ * 		Q3  =  -9.9206344733435987357E-6,
+ * 		Q4  =   2.5051361420808517002E-7,
+ * 		Q5  =  -6.2843505682382617102E-9;
+ *  	(where z=r*r, and the values of Q1 to Q5 are listed below)
+ *	with error bounded by
+ *	    |                  5           |     -61
+ *	    | 1.0+Q1*z+...+Q5*z   -  R1(z) | <= 2 
+ *	    |                              |
+ *	
+ *	expm1(r) = exp(r)-1 is then computed by the following 
+ * 	specific way which minimize the accumulation rounding error: 
+ *			       2     3
+ *			      r     r    [ 3 - (R1 + R1*r/2)  ]
+ *	      expm1(r) = r + --- + --- * [--------------------]
+ *		              2     2    [ 6 - r*(3 - R1*r/2) ]
+ *	
+ *	To compensate the error in the argument reduction, we use
+ *		expm1(r+c) = expm1(r) + c + expm1(r)*c 
+ *			   ~ expm1(r) + c + r*c 
+ *	Thus c+r*c will be added in as the correction terms for
+ *	expm1(r+c). Now rearrange the term to avoid optimization 
+ * 	screw up:
+ *		        (      2                                    2 )
+ *		        ({  ( r    [ R1 -  (3 - R1*r/2) ]  )  }    r  )
+ *	 expm1(r+c)~r - ({r*(--- * [--------------------]-c)-c} - --- )
+ *	                ({  ( 2    [ 6 - r*(3 - R1*r/2) ]  )  }    2  )
+ *                      (                                             )
+ *    	
+ *		   = r - E
+ *   3. Scale back to obtain expm1(x):
+ *	From step 1, we have
+ *	   expm1(x) = either 2^k*[expm1(r)+1] - 1
+ *		    = or     2^k*[expm1(r) + (1-2^-k)]
+ *   4. Implementation notes:
+ *	(A). To save one multiplication, we scale the coefficient Qi
+ *	     to Qi*2^i, and replace z by (x^2)/2.
+ *	(B). To achieve maximum accuracy, we compute expm1(x) by
+ *	  (i)   if x < -56*ln2, return -1.0, (raise inexact if x!=inf)
+ *	  (ii)  if k=0, return r-E
+ *	  (iii) if k=-1, return 0.5*(r-E)-0.5
+ *        (iv)	if k=1 if r < -0.25, return 2*((r+0.5)- E)
+ *	       	       else	     return  1.0+2.0*(r-E);
+ *	  (v)   if (k<-2||k>56) return 2^k(1-(E-r)) - 1 (or exp(x)-1)
+ *	  (vi)  if k <= 20, return 2^k((1-2^-k)-(E-r)), else
+ *	  (vii) return 2^k(1-((E+2^-k)-r)) 
+ *
+ * Special cases:
+ *	expm1(INF) is INF, expm1(NaN) is NaN;
+ *	expm1(-INF) is -1, and
+ *	for finite argument, only expm1(0)=0 is exact.
+ *
+ * Accuracy:
+ *	according to an error analysis, the error is always less than
+ *	1 ulp (unit in the last place).
+ *
+ * Misc. info.
+ *	For IEEE double 
+ *	    if x >  7.09782712893383973096e+02 then expm1(x) overflow
+ *
+ * Constants:
+ * The hexadecimal values are the intended ones for the following 
+ * constants. The decimal values may be used, provided that the 
+ * compiler will convert from decimal to binary accurately enough
+ * to produce the hexadecimal values shown.
+ */
+
+#include "fdlibm.h"
+
+#ifdef __STDC__
+static const double
+#else
+static double
+#endif
+one		= 1.0,
+huge		= 1.0e+300,
+tiny		= 1.0e-300,
+o_threshold	= 7.09782712893383973096e+02,/* 0x40862E42, 0xFEFA39EF */
+ln2_hi		= 6.93147180369123816490e-01,/* 0x3fe62e42, 0xfee00000 */
+ln2_lo		= 1.90821492927058770002e-10,/* 0x3dea39ef, 0x35793c76 */
+invln2		= 1.44269504088896338700e+00,/* 0x3ff71547, 0x652b82fe */
+	/* scaled coefficients related to expm1 */
+Q1  =  -3.33333333333331316428e-02, /* BFA11111 111110F4 */
+Q2  =   1.58730158725481460165e-03, /* 3F5A01A0 19FE5585 */
+Q3  =  -7.93650757867487942473e-05, /* BF14CE19 9EAADBB7 */
+Q4  =   4.00821782732936239552e-06, /* 3ED0CFCA 86E65239 */
+Q5  =  -2.01099218183624371326e-07; /* BE8AFDB7 6E09C32D */
+
+#ifdef __STDC__
+	double expm1(double x)
+#else
+	double expm1(x)
+	double x;
+#endif
+{
+	double y,hi,lo,c,t,e,hxs,hfx,r1;
+	int k,xsb;
+	unsigned hx;
+
+	hx  = __HI(x);	/* high word of x */
+	xsb = hx&0x80000000;		/* sign bit of x */
+	if(xsb==0) y=x; else y= -x;	/* y = |x| */
+	hx &= 0x7fffffff;		/* high word of |x| */
+
+    /* filter out huge and non-finite argument */
+	if(hx >= 0x4043687A) {			/* if |x|>=56*ln2 */
+	    if(hx >= 0x40862E42) {		/* if |x|>=709.78... */
+                if(hx>=0x7ff00000) {
+		    if(((hx&0xfffff)|__LO(x))!=0) 
+		         return x+x; 	 /* NaN */
+		    else return (xsb==0)? x:-1.0;/* exp(+-inf)={inf,-1} */
+	        }
+	        if(x > o_threshold) return huge*huge; /* overflow */
+	    }
+	    if(xsb!=0) { /* x < -56*ln2, return -1.0 with inexact */
+		if(x+tiny<0.0)		/* raise inexact */
+		return tiny-one;	/* return -1 */
+	    }
+	}
+
+    /* argument reduction */
+	if(hx > 0x3fd62e42) {		/* if  |x| > 0.5 ln2 */ 
+	    if(hx < 0x3FF0A2B2) {	/* and |x| < 1.5 ln2 */
+		if(xsb==0)
+		    {hi = x - ln2_hi; lo =  ln2_lo;  k =  1;}
+		else
+		    {hi = x + ln2_hi; lo = -ln2_lo;  k = -1;}
+	    } else {
+		k  = invln2*x+((xsb==0)?0.5:-0.5);
+		t  = k;
+		hi = x - t*ln2_hi;	/* t*ln2_hi is exact here */
+		lo = t*ln2_lo;
+	    }
+	    x  = hi - lo;
+	    c  = (hi-x)-lo;
+	} 
+	else if(hx < 0x3c900000) {  	/* when |x|<2**-54, return x */
+	    t = huge+x;	/* return x with inexact flags when x!=0 */
+	    return x - (t-(huge+x));	
+	}
+	else k = 0;
+
+    /* x is now in primary range */
+	hfx = 0.5*x;
+	hxs = x*hfx;
+	r1 = one+hxs*(Q1+hxs*(Q2+hxs*(Q3+hxs*(Q4+hxs*Q5))));
+	t  = 3.0-r1*hfx;
+	e  = hxs*((r1-t)/(6.0 - x*t));
+	if(k==0) return x - (x*e-hxs);		/* c is 0 */
+	else {
+	    e  = (x*(e-c)-c);
+	    e -= hxs;
+	    if(k== -1) return 0.5*(x-e)-0.5;
+	    if(k==1) 
+	       	if(x < -0.25) return -2.0*(e-(x+0.5));
+	       	else 	      return  one+2.0*(x-e);
+	    if (k <= -2 || k>56) {   /* suffice to return exp(x)-1 */
+	        y = one-(e-x);
+	        __HI(y) += (k<<20);	/* add k to y's exponent */
+	        return y-one;
+	    }
+	    t = one;
+	    if(k<20) {
+	       	__HI(t) = 0x3ff00000 - (0x200000>>k);  /* t=1-2^-k */
+	       	y = t-(e-x);
+	       	__HI(y) += (k<<20);	/* add k to y's exponent */
+	   } else {
+	       	__HI(t)  = ((0x3ff-k)<<20);	/* 2^-k */
+	       	y = x-(e+t);
+	       	y += one;
+	       	__HI(y) += (k<<20);	/* add k to y's exponent */
+	    }
+	}
+	return y;
+}

-----------------------------------------------------------------------

Summary of changes:
 src/lisp/Config.x86_darwin |    6 +-
 src/lisp/s_expm1.c         |  228 ++++++++++++++++++++++++++++++++++++++++++++
 src/lisp/s_log1p.c         |   26 +++--
 3 files changed, 250 insertions(+), 10 deletions(-)
 create mode 100644 src/lisp/s_expm1.c


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