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Diffstat (limited to 'newlib/libm/machine/spu/headers/lround.h')
-rw-r--r--newlib/libm/machine/spu/headers/lround.h84
1 files changed, 84 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/lround.h b/newlib/libm/machine/spu/headers/lround.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 _LROUND_H_
+#define _LROUND_H_ 1
+
+#include <spu_intrinsics.h>
+#include "headers/vec_literal.h"
+
+/* Round the input to the nearest integer value, rounding halfway cases
+ * away from zero. No special handling is performed when values are
+ * outside the 32-bit range.
+ */
+
+static __inline long int _lround(double x)
+{
+ int shift;
+ vec_int4 exp;
+ vec_uint4 mant, sign, mask, addend;
+ vec_double2 in;
+
+ in = spu_promote(x, 0);
+
+ /* Determine how many bits to shift the mantissa to correctly
+ * align it into long long element 0.
+ */
+ exp = spu_and(spu_rlmask((vec_int4)in, -20), 0x7FF);
+ exp = spu_add(exp, -979);
+ shift = spu_extract(exp, 0);
+
+ mask = spu_cmpgt(exp, 0);
+
+ /* Algn mantissa bits
+ */
+ mant = spu_sel(spu_rlmaskqwbyte((vec_uint4)in, -8), VEC_SPLAT_U32(0x00100000),
+ VEC_LITERAL(vec_uint4, 0,0,0xFFF00000,0));
+
+ mant = spu_slqwbytebc(spu_slqw(mant, shift), shift);
+
+ /* Perform round by adding 1 if the fraction bits are
+ * greater than or equal to .5
+ */
+ addend = spu_and(spu_rlqw(mant, 1), 1);
+ mant = spu_and(spu_add(mant, addend), mask);
+
+ /* Compute the two's complement of the mantissa if the
+ * input is negative.
+ */
+ sign = (vec_uint4)spu_rlmaska((vec_int4)in, -31);
+
+ mant = spu_sub(spu_xor(mant, sign), sign);
+
+ return ((long int)spu_extract(mant, 0));
+}
+#endif /* _LROUND_H_ */