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Diffstat (limited to 'newlib/libm/machine/spu/headers/frexp.h')
-rw-r--r--newlib/libm/machine/spu/headers/frexp.h74
1 files changed, 74 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/frexp.h b/newlib/libm/machine/spu/headers/frexp.h
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+/*
+ (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 _FREXP_H_
+#define _FREXP_H_ 1
+
+#include <spu_intrinsics.h>
+#include "headers/vec_literal.h"
+
+/* Return the normalized fraction and exponent to the number x.
+ * Double precision denorms treated as zero and return a 0
+ * fraction and 0 exponent. The results are undefined for infinities
+ * and NaNs (double precision only).
+ */
+static __inline double _frexp(double x, int *pexp)
+{
+ vec_int4 exp;
+ vec_uint4 denorm, mask;
+ vec_double2 in, mant;
+ vec_double2 half = VEC_SPLAT_F64(0.5);
+ vec_ullong2 exp_mask = VEC_SPLAT_U64(0x7FF0000000000000ULL);
+
+ in = spu_promote(x, 0);
+
+ /* Normalize the mantissa (fraction part).
+ */
+ mant = spu_sel(in, half, exp_mask);
+
+ /* Zero the mantissa if the input is a denorm or zero
+ */
+ exp = spu_and(spu_rlmask((vec_int4)in, -20), 0x7FF);
+ denorm = spu_cmpeq(exp, 0);
+ mask = spu_shuffle(denorm, denorm, VEC_SPLAT_U8(0));
+ mant = spu_andc(mant, (vec_double2)mask);
+
+ /* Zero exponent if zero or denorm input. Otherwise, compute
+ * exponent by removing the bias.
+ */
+ exp = spu_andc(spu_add(exp, -1022), (vec_int4)mask);
+
+ *pexp = spu_extract(exp, 0);
+
+ return (spu_extract(mant, 0));
+}
+#endif /* _FREXPF_H_ */