Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 179 insertions, 0 deletions

diff --git a/modules/fdlibm/src/e_rem_pio2.cpp b/modules/fdlibm/src/e_rem_pio2.cpp
new file mode 100644
index 0000000000..1e5e1cc9f4
--- /dev/null
+++ b/modules/fdlibm/src/e_rem_pio2.cpp
@@ -0,0 +1,179 @@
+
+/* @(#)e_rem_pio2.c 1.4 95/01/18 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunSoft, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice 
+ * is preserved.
+ * ====================================================
+ *
+ * Optimized by Bruce D. Evans.
+ */
+
+//#include <sys/cdefs.h>
+//__FBSDID("$FreeBSD$");
+
+/* __ieee754_rem_pio2(x,y)
+ * 
+ * return the remainder of x rem pi/2 in y[0]+y[1] 
+ * use __kernel_rem_pio2()
+ */
+
+#include <float.h>
+
+#include "math_private.h"
+
+/*
+ * invpio2:  53 bits of 2/pi
+ * pio2_1:   first  33 bit of pi/2
+ * pio2_1t:  pi/2 - pio2_1
+ * pio2_2:   second 33 bit of pi/2
+ * pio2_2t:  pi/2 - (pio2_1+pio2_2)
+ * pio2_3:   third  33 bit of pi/2
+ * pio2_3t:  pi/2 - (pio2_1+pio2_2+pio2_3)
+ */
+
+static const double
+zero =  0.00000000000000000000e+00, /* 0x00000000, 0x00000000 */
+two24 =  1.67772160000000000000e+07, /* 0x41700000, 0x00000000 */
+invpio2 =  6.36619772367581382433e-01, /* 0x3FE45F30, 0x6DC9C883 */
+pio2_1  =  1.57079632673412561417e+00, /* 0x3FF921FB, 0x54400000 */
+pio2_1t =  6.07710050650619224932e-11, /* 0x3DD0B461, 0x1A626331 */
+pio2_2  =  6.07710050630396597660e-11, /* 0x3DD0B461, 0x1A600000 */
+pio2_2t =  2.02226624879595063154e-21, /* 0x3BA3198A, 0x2E037073 */
+pio2_3  =  2.02226624871116645580e-21, /* 0x3BA3198A, 0x2E000000 */
+pio2_3t =  8.47842766036889956997e-32; /* 0x397B839A, 0x252049C1 */
+
+#ifdef INLINE_REM_PIO2
+static inline
+#endif
+int
+__ieee754_rem_pio2(double x, double *y)
+{
+	double z,w,t,r,fn;
+	double tx[3],ty[2];
+	int32_t e0,i,j,nx,n,ix,hx;
+	u_int32_t low;
+
+	GET_HIGH_WORD(hx,x);		/* high word of x */
+	ix = hx&0x7fffffff;
+#if 0 /* Must be handled in caller. */
+	if(ix<=0x3fe921fb)   /* |x| ~<= pi/4 , no need for reduction */
+	    {y[0] = x; y[1] = 0; return 0;}
+#endif
+	if (ix <= 0x400f6a7a) {		/* |x| ~<= 5pi/4 */
+	    if ((ix & 0xfffff) == 0x921fb)  /* |x| ~= pi/2 or 2pi/2 */
+		goto medium;		/* cancellation -- use medium case */
+	    if (ix <= 0x4002d97c) {	/* |x| ~<= 3pi/4 */
+		if (hx > 0) {
+		    z = x - pio2_1;	/* one round good to 85 bits */
+		    y[0] = z - pio2_1t;
+		    y[1] = (z-y[0])-pio2_1t;
+		    return 1;
+		} else {
+		    z = x + pio2_1;
+		    y[0] = z + pio2_1t;
+		    y[1] = (z-y[0])+pio2_1t;
+		    return -1;
+		}
+	    } else {
+		if (hx > 0) {
+		    z = x - 2*pio2_1;
+		    y[0] = z - 2*pio2_1t;
+		    y[1] = (z-y[0])-2*pio2_1t;
+		    return 2;
+		} else {
+		    z = x + 2*pio2_1;
+		    y[0] = z + 2*pio2_1t;
+		    y[1] = (z-y[0])+2*pio2_1t;
+		    return -2;
+		}
+	    }
+	}
+	if (ix <= 0x401c463b) {		/* |x| ~<= 9pi/4 */
+	    if (ix <= 0x4015fdbc) {	/* |x| ~<= 7pi/4 */
+		if (ix == 0x4012d97c)	/* |x| ~= 3pi/2 */
+		    goto medium;
+		if (hx > 0) {
+		    z = x - 3*pio2_1;
+		    y[0] = z - 3*pio2_1t;
+		    y[1] = (z-y[0])-3*pio2_1t;
+		    return 3;
+		} else {
+		    z = x + 3*pio2_1;
+		    y[0] = z + 3*pio2_1t;
+		    y[1] = (z-y[0])+3*pio2_1t;
+		    return -3;
+		}
+	    } else {
+		if (ix == 0x401921fb)	/* |x| ~= 4pi/2 */
+		    goto medium;
+		if (hx > 0) {
+		    z = x - 4*pio2_1;
+		    y[0] = z - 4*pio2_1t;
+		    y[1] = (z-y[0])-4*pio2_1t;
+		    return 4;
+		} else {
+		    z = x + 4*pio2_1;
+		    y[0] = z + 4*pio2_1t;
+		    y[1] = (z-y[0])+4*pio2_1t;
+		    return -4;
+		}
+	    }
+	}
+	if(ix<0x413921fb) {	/* |x| ~< 2^20*(pi/2), medium size */
+medium:
+	    fn = rnint((double_t)x*invpio2);
+	    n  = irint(fn);
+	    r  = x-fn*pio2_1;
+	    w  = fn*pio2_1t;	/* 1st round good to 85 bit */
+	    {
+	        u_int32_t high;
+	        j  = ix>>20;
+	        y[0] = r-w; 
+		GET_HIGH_WORD(high,y[0]);
+	        i = j-((high>>20)&0x7ff);
+	        if(i>16) {  /* 2nd iteration needed, good to 118 */
+		    t  = r;
+		    w  = fn*pio2_2;	
+		    r  = t-w;
+		    w  = fn*pio2_2t-((t-r)-w);	
+		    y[0] = r-w;
+		    GET_HIGH_WORD(high,y[0]);
+		    i = j-((high>>20)&0x7ff);
+		    if(i>49)  {	/* 3rd iteration need, 151 bits acc */
+		    	t  = r;	/* will cover all possible cases */
+		    	w  = fn*pio2_3;	
+		    	r  = t-w;
+		    	w  = fn*pio2_3t-((t-r)-w);	
+		    	y[0] = r-w;
+		    }
+		}
+	    }
+	    y[1] = (r-y[0])-w;
+	    return n;
+	}
+    /* 
+     * all other (large) arguments
+     */
+	if(ix>=0x7ff00000) {		/* x is inf or NaN */
+	    y[0]=y[1]=x-x; return 0;
+	}
+    /* set z = scalbn(|x|,ilogb(x)-23) */
+	GET_LOW_WORD(low,x);
+	e0 	= (ix>>20)-1046;	/* e0 = ilogb(z)-23; */
+	INSERT_WORDS(z, ix - ((int32_t)(e0<<20)), low);
+	for(i=0;i<2;i++) {
+		tx[i] = (double)((int32_t)(z));
+		z     = (z-tx[i])*two24;
+	}
+	tx[2] = z;
+	nx = 3;
+	while(tx[nx-1]==zero) nx--;	/* skip zero term */
+	n  =  __kernel_rem_pio2(tx,ty,e0,nx,1);
+	if(hx<0) {y[0] = -ty[0]; y[1] = -ty[1]; return -n;}
+	y[0] = ty[0]; y[1] = ty[1]; return n;
+}