1 files changed, 63 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/s_scalbn.c b/REORG.TODO/sysdeps/ieee754/dbl-64/s_scalbn.c
new file mode 100644
index 0000000000..58c7e1b33a
--- /dev/null
+++ b/REORG.TODO/sysdeps/ieee754/dbl-64/s_scalbn.c
@@ -0,0 +1,63 @@
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+/*
+ * scalbn (double x, int n)
+ * scalbn(x,n) returns x* 2**n  computed by  exponent
+ * manipulation rather than by actually performing an
+ * exponentiation or a multiplication.
+ */
+
+#include <math.h>
+#include <math_private.h>
+
+static const double
+  two54 = 1.80143985094819840000e+16,  /* 0x43500000, 0x00000000 */
+  twom54 = 5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */
+  huge = 1.0e+300,
+  tiny = 1.0e-300;
+
+double
+__scalbn (double x, int n)
+{
+  int32_t k, hx, lx;
+  EXTRACT_WORDS (hx, lx, x);
+  k = (hx & 0x7ff00000) >> 20;                  /* extract exponent */
+  if (__glibc_unlikely (k == 0))                   /* 0 or subnormal x */
+    {
+      if ((lx | (hx & 0x7fffffff)) == 0)
+	return x;                                  /* +-0 */
+      x *= two54;
+      GET_HIGH_WORD (hx, x);
+      k = ((hx & 0x7ff00000) >> 20) - 54;
+    }
+  if (__glibc_unlikely (k == 0x7ff))
+    return x + x;                                       /* NaN or Inf */
+  if (__glibc_unlikely (n < -50000))
+    return tiny * __copysign (tiny, x);   /*underflow*/
+  if (__glibc_unlikely (n > 50000 || k + n > 0x7fe))
+    return huge * __copysign (huge, x);   /* overflow  */
+  /* Now k and n are bounded we know that k = k+n does not
+     overflow.  */
+  k = k + n;
+  if (__glibc_likely (k > 0))                    /* normal result */
+    {
+      SET_HIGH_WORD (x, (hx & 0x800fffff) | (k << 20)); return x;
+    }
+  if (k <= -54)
+    return tiny * __copysign (tiny, x);         /*underflow*/
+  k += 54;                                      /* subnormal result */
+  SET_HIGH_WORD (x, (hx & 0x800fffff) | (k << 20));
+  return x * twom54;
+}
+#ifdef NO_LONG_DOUBLE
+strong_alias (__scalbn, __scalbnl)
+#endif