1 files changed, 86 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/ilogb.h b/newlib/libm/machine/spu/headers/ilogb.h
new file mode 100644
index 000000000..c0699a19a
--- /dev/null
+++ b/newlib/libm/machine/spu/headers/ilogb.h
@@ -0,0 +1,86 @@
+/*
+  (C) Copyright 2001,2006,
+  International Business Machines Corporation,
+  Sony Computer Entertainment, Incorporated,
+  Toshiba Corporation,
+
+  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 names of the copyright holders nor the names of their
+  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 _ILOGB_H_
+#define _ILOGB_H_	1
+
+#include <spu_intrinsics.h>
+#include "headers/vec_literal.h"
+#include <limits.h>
+#include <math.h>
+
+/* ilogb returns the signed exponent in the floating-point
+ * input. Special numbers include:
+ *     Input     Output
+ *     =====    =====================
+ * 	INF     FP_ILOGBNAN (INT_MAX)
+ * 	NAN     FP_ILOGBNAN (INT_MAX)
+ *     denorm   exponent - leading zeros
+ * 	 0      FP_ILOGB0 (INT_MIN)
+ *      else	signed exponent
+ */
+
+static __inline int _ilogb(double x)
+{
+  vec_uint4 v, exp, exp_0, mant, mask, count;
+  vec_uint4 flg_exp_0, flg_exp_max;
+
+  mask = VEC_SPLAT_U32(0x7FF);
+
+  /* Extract the exponent and mantissa.
+   */
+  v = (vec_uint4)spu_promote(x, 0);
+
+  exp = spu_and(spu_rlmask(v, -20), mask);
+
+  mant = spu_and(v, VEC_LITERAL(vec_uint4, 0x000FFFFF, 0xFFFFFFFF, 0, 0));
+
+  /* Count the leading zeros in the mantissa for denorm handling
+   * and zero identification.
+   */
+  count = spu_cntlz(mant);
+  count = spu_add(count, spu_and(spu_rlqwbyte(count, 4), spu_cmpeq(count, 32)));
+
+  flg_exp_0 = spu_cmpeq(exp, 0);
+  flg_exp_max = spu_cmpeq(exp, mask);
+
+  exp = spu_add(exp, -1023);
+
+  /* Determine the exponent if the input is a denorm or zero.
+   */
+  exp_0 = spu_sel(spu_sub(spu_add(exp, 12), count), VEC_SPLAT_U32(FP_ILOGB0), spu_cmpeq(count, 64));
+
+  exp = spu_sel(spu_sel(exp, VEC_SPLAT_U32(FP_ILOGBNAN), flg_exp_max), exp_0, flg_exp_0);
+
+  return (spu_extract((vec_int4)(exp), 0));
+}
+#endif /* _ILOGB_H_ */