added updated version of simdmathlibrary-1.0.1

Extras/simdmathlibrary/spu/simdmath/divu4.h

@@ -0,0 +1,102 @@
+/* divu4 - 
+   Copyright (C) 2006, 2007 Sony Computer Entertainment Inc.
+   All rights reserved.
+
+   Redistribution and use in source and binary forms,
+   with or without modification, are permitted provided that the
+   following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of the Sony Computer Entertainment Inc nor the names
+      of its contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+   CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+   SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+   POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ___SIMD_MATH_DIVU4_H___
+#define ___SIMD_MATH_DIVU4_H___
+
+#include <simdmath.h>
+#include <spu_intrinsics.h>
+
+// divu4 - for each of four unsigned integer slots, compute quotient and remainder of numer/denom
+// and store in divu4_t struct.  Divide by zero produces quotient = 0, remainder = numerator.
+
+static inline divu4_t
+_divu4 (vector unsigned int numer, vector unsigned int denom)
+{
+  divu4_t res;
+  vec_int4 shift;
+  vec_uint4 quot, newQuot;
+  vec_uint4 denomZeros, numerZeros, denomLeft, oneLeft, denomShifted, oneShifted;
+  vec_uint4 newNum, skip, cont;
+  int       anyCont;
+
+  // Get difference of leading zeros.
+  // Any possible negative value will be interpreted as a shift > 31
+
+  denomZeros = spu_cntlz( denom );
+  numerZeros = spu_cntlz( numer );
+
+  shift = (vec_int4)spu_sub( denomZeros, numerZeros );
+
+  // Shift denom to align leading one with numerator's
+
+  denomShifted = spu_sl( denom, (vec_uint4)shift );
+  oneShifted = spu_sl( spu_splats(1U), (vec_uint4)shift );
+  oneShifted = spu_sel( oneShifted, spu_splats(0U), spu_cmpeq( denom, 0 ) );
+
+  // Shift left all leading zeros.
+
+  denomLeft = spu_sl( denom, denomZeros );
+  oneLeft = spu_sl( spu_splats(1U), denomZeros );
+
+  quot = spu_splats(0U);
+
+  do
+    {
+      cont = spu_cmpgt( oneShifted, 0U );
+      anyCont = spu_extract( spu_gather( cont ), 0 );
+
+      newQuot = spu_or( quot, oneShifted );
+
+      // Subtract shifted denominator from remaining numerator 
+      // when denominator is not greater.
+
+      skip = spu_cmpgt( denomShifted, numer );
+      newNum = spu_sub( numer, denomShifted );
+
+      // If denominator is greater, next shift is one more, otherwise
+      // next shift is number of leading zeros of remaining numerator.
+
+      numerZeros = spu_sel( spu_cntlz( newNum ), numerZeros, skip );
+      shift = (vec_int4)spu_sub( skip, numerZeros );
+
+      oneShifted = spu_rlmask( oneLeft, shift );
+      denomShifted = spu_rlmask( denomLeft, shift );
+
+      quot = spu_sel( newQuot, quot, skip );
+      numer = spu_sel( newNum, numer, spu_orc(skip,cont) );
+    } 
+  while ( anyCont );
+
+  res.quot = quot;
+  res.rem = numer;
+  return res;
+}
+
+#endif