1 files changed, 77 insertions, 0 deletions
diff --git a/modules/fdlibm/src/e_rem_pio2f.cpp b/modules/fdlibm/src/e_rem_pio2f.cpp
new file mode 100644
index 0000000000..49a30a6fa1
--- /dev/null
+++ b/modules/fdlibm/src/e_rem_pio2f.cpp
@@ -0,0 +1,77 @@
+/* e_rem_pio2f.c -- float version of e_rem_pio2.c
+ * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
+ * Debugged and optimized by Bruce D. Evans.
+ */
+
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+//#include <sys/cdefs.h>
+//__FBSDID("$FreeBSD$");
+
+/* __ieee754_rem_pio2f(x,y)
+ *
+ * return the remainder of x rem pi/2 in *y
+ * use double precision for everything except passing x
+ * use __kernel_rem_pio2() for large x
+ */
+
+#include <float.h>
+
+#include "math_private.h"
+
+/*
+ * invpio2:  53 bits of 2/pi
+ * pio2_1:   first 25 bits of pi/2
+ * pio2_1t:  pi/2 - pio2_1
+ */
+
+static const double
+invpio2 =  6.36619772367581382433e-01, /* 0x3FE45F30, 0x6DC9C883 */
+pio2_1  =  1.57079631090164184570e+00, /* 0x3FF921FB, 0x50000000 */
+pio2_1t =  1.58932547735281966916e-08; /* 0x3E5110b4, 0x611A6263 */
+
+#ifdef INLINE_REM_PIO2F
+static inline
+#endif
+int
+__ieee754_rem_pio2f(float x, double *y)
+{
+	double w,r,fn;
+	double tx[1],ty[1];
+	float z;
+	int32_t e0,n,ix,hx;
+
+	GET_FLOAT_WORD(hx,x);
+	ix = hx&0x7fffffff;
+    /* 33+53 bit pi is good enough for medium size */
+	if(ix<0x4dc90fdb) {		/* |x| ~< 2^28*(pi/2), medium size */
+	    fn = rnint((float)x*invpio2);
+	    n  = irint(fn);
+	    r  = x-fn*pio2_1;
+	    w  = fn*pio2_1t;
+	    *y = r-w;
+	    return n;
+	}
+    /*
+     * all other (large) arguments
+     */
+	if(ix>=0x7f800000) {		/* x is inf or NaN */
+	    *y=x-x; return 0;
+	}
+    /* set z = scalbn(|x|,ilogb(|x|)-23) */
+	e0 = (ix>>23)-150;		/* e0 = ilogb(|x|)-23; */
+	SET_FLOAT_WORD(z, ix - ((int32_t)(e0<<23)));
+	tx[0] = z;
+	n  =  __kernel_rem_pio2(tx,ty,e0,1,0);
+	if(hx<0) {*y = -ty[0]; return -n;}
+	*y = ty[0]; return n;
+}