Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 173 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/e_fmod.c b/REORG.TODO/sysdeps/ieee754/dbl-64/e_fmod.c
new file mode 100644
index 0000000000..e82b302200
--- /dev/null
+++ b/REORG.TODO/sysdeps/ieee754/dbl-64/e_fmod.c
@@ -0,0 +1,173 @@
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+/*
+ * __ieee754_fmod(x,y)
+ * Return x mod y in exact arithmetic
+ * Method: shift and subtract
+ */
+
+#include <math.h>
+#include <math_private.h>
+
+static const double one = 1.0, Zero[] = { 0.0, -0.0, };
+
+double
+__ieee754_fmod (double x, double y)
+{
+  int32_t n, hx, hy, hz, ix, iy, sx, i;
+  u_int32_t lx, ly, lz;
+
+  EXTRACT_WORDS (hx, lx, x);
+  EXTRACT_WORDS (hy, ly, y);
+  sx = hx & 0x80000000;                 /* sign of x */
+  hx ^= sx;                     /* |x| */
+  hy &= 0x7fffffff;             /* |y| */
+
+  /* purge off exception values */
+  if ((hy | ly) == 0 || (hx >= 0x7ff00000) ||   /* y=0,or x not finite */
+      ((hy | ((ly | -ly) >> 31)) > 0x7ff00000)) /* or y is NaN */
+    return (x * y) / (x * y);
+  if (hx <= hy)
+    {
+      if ((hx < hy) || (lx < ly))
+	return x;                               /* |x|<|y| return x */
+      if (lx == ly)
+	return Zero[(u_int32_t) sx >> 31];      /* |x|=|y| return x*0*/
+    }
+
+  /* determine ix = ilogb(x) */
+  if (__glibc_unlikely (hx < 0x00100000))                  /* subnormal x */
+    {
+      if (hx == 0)
+	{
+	  for (ix = -1043, i = lx; i > 0; i <<= 1)
+	    ix -= 1;
+	}
+      else
+	{
+	  for (ix = -1022, i = (hx << 11); i > 0; i <<= 1)
+	    ix -= 1;
+	}
+    }
+  else
+    ix = (hx >> 20) - 1023;
+
+  /* determine iy = ilogb(y) */
+  if (__glibc_unlikely (hy < 0x00100000))                  /* subnormal y */
+    {
+      if (hy == 0)
+	{
+	  for (iy = -1043, i = ly; i > 0; i <<= 1)
+	    iy -= 1;
+	}
+      else
+	{
+	  for (iy = -1022, i = (hy << 11); i > 0; i <<= 1)
+	    iy -= 1;
+	}
+    }
+  else
+    iy = (hy >> 20) - 1023;
+
+  /* set up {hx,lx}, {hy,ly} and align y to x */
+  if (__glibc_likely (ix >= -1022))
+    hx = 0x00100000 | (0x000fffff & hx);
+  else                  /* subnormal x, shift x to normal */
+    {
+      n = -1022 - ix;
+      if (n <= 31)
+	{
+	  hx = (hx << n) | (lx >> (32 - n));
+	  lx <<= n;
+	}
+      else
+	{
+	  hx = lx << (n - 32);
+	  lx = 0;
+	}
+    }
+  if (__glibc_likely (iy >= -1022))
+    hy = 0x00100000 | (0x000fffff & hy);
+  else                  /* subnormal y, shift y to normal */
+    {
+      n = -1022 - iy;
+      if (n <= 31)
+	{
+	  hy = (hy << n) | (ly >> (32 - n));
+	  ly <<= n;
+	}
+      else
+	{
+	  hy = ly << (n - 32);
+	  ly = 0;
+	}
+    }
+
+  /* fix point fmod */
+  n = ix - iy;
+  while (n--)
+    {
+      hz = hx - hy; lz = lx - ly; if (lx < ly)
+	hz -= 1;
+      if (hz < 0)
+	{
+	  hx = hx + hx + (lx >> 31); lx = lx + lx;
+	}
+      else
+	{
+	  if ((hz | lz) == 0)           /* return sign(x)*0 */
+	    return Zero[(u_int32_t) sx >> 31];
+	  hx = hz + hz + (lz >> 31); lx = lz + lz;
+	}
+    }
+  hz = hx - hy; lz = lx - ly; if (lx < ly)
+    hz -= 1;
+  if (hz >= 0)
+    {
+      hx = hz; lx = lz;
+    }
+
+  /* convert back to floating value and restore the sign */
+  if ((hx | lx) == 0)                   /* return sign(x)*0 */
+    return Zero[(u_int32_t) sx >> 31];
+  while (hx < 0x00100000)               /* normalize x */
+    {
+      hx = hx + hx + (lx >> 31); lx = lx + lx;
+      iy -= 1;
+    }
+  if (__glibc_likely (iy >= -1022))              /* normalize output */
+    {
+      hx = ((hx - 0x00100000) | ((iy + 1023) << 20));
+      INSERT_WORDS (x, hx | sx, lx);
+    }
+  else                          /* subnormal output */
+    {
+      n = -1022 - iy;
+      if (n <= 20)
+	{
+	  lx = (lx >> n) | ((u_int32_t) hx << (32 - n));
+	  hx >>= n;
+	}
+      else if (n <= 31)
+	{
+	  lx = (hx << (32 - n)) | (lx >> n); hx = sx;
+	}
+      else
+	{
+	  lx = hx >> (n - 32); hx = sx;
+	}
+      INSERT_WORDS (x, hx | sx, lx);
+      x *= one;                 /* create necessary signal */
+    }
+  return x;                     /* exact output */
+}
+strong_alias (__ieee754_fmod, __fmod_finite)