1 files changed, 77 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/scalbnf.h b/newlib/libm/machine/spu/headers/scalbnf.h
new file mode 100644
index 000000000..56ed1ef87
--- /dev/null
+++ b/newlib/libm/machine/spu/headers/scalbnf.h
@@ -0,0 +1,77 @@
+/*
+  (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 _SCALBNF_H_
+#define _SCALBNF_H_	1
+
+#include <spu_intrinsics.h>
+#include "headers/vec_literal.h"
+
+/* scalbnf computes x * 2^exp. This function is computed without
+ * the assistence of any floating point operations and as such does
+ * not set any floating point exceptions.
+ */
+static __inline float _scalbnf(float x, int exp)
+{
+  vec_int4 x_exp;
+  vec_uint4 zero, overflow;
+  vec_uint4 exp_mask = VEC_SPLAT_U32(0x7F800000);
+  vec_float4 in, out;
+
+  in = spu_promote(x, 0);
+
+  /* Extract exponent from x. If the exponent is 0, then
+   * x is either 0 or a denorm and x*2^exp is a zero.
+   */
+  x_exp = spu_and(spu_rlmask((vec_int4)in, -23), 0xFF);
+
+  zero = spu_cmpeq(x_exp, 0);
+
+  /* Compute the expected exponent and determine if the
+   * result is within range.
+   */
+  x_exp = spu_add(spu_promote(exp, 0), x_exp);
+
+  zero = spu_orc(zero, spu_cmpgt(x_exp, 0));
+
+  overflow = spu_rlmask(spu_cmpgt(x_exp, 255), -1);
+
+  /* Merge the expect exponent with x's mantissa. Zero the
+   * result if underflow and force to max if overflow.
+   */
+  out = spu_sel(in, (vec_float4)spu_rl(x_exp, 23), exp_mask);
+  out = spu_andc(out, (vec_float4)zero);
+  out = spu_or(out, (vec_float4)overflow);
+
+  return (spu_extract(out, 0));
+}
+#endif /* _SCALBNF_H_ */