57 lines
1.3 KiB
Common Lisp
57 lines
1.3 KiB
Common Lisp
//===-- floatundidf.c - Implement __floatundidf ---------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Referenced from floatundidf.c, but implemented in OpenCL language
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//
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//===----------------------------------------------------------------------===//
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#ifdef cl_khr_fp64
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#pragma OPENCL EXTENSION cl_khr_fp64 : enable
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#include "types.h"
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double __floatundidf(du_int a) {
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if (a == 0)
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return 0.0;
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const unsigned N = sizeof(du_int) * 8;
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int sd = N - __builtin_clzll(a);
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int e = sd - 1;
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if (sd > DBL_MANT_DIG) {
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switch (sd) {
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case DBL_MANT_DIG + 1:
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a <<= 1;
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break;
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case DBL_MANT_DIG + 2:
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break;
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default:
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a = (a >> (sd - (DBL_MANT_DIG + 2))) |
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((a & ((du_int)(-1) >> ((N + DBL_MANT_DIG + 2) - sd))) != 0);
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};
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a |= (a & 4) != 0;
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++a;
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a >>= 2;
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if (a & ((du_int)1 << DBL_MANT_DIG)) {
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a >>= 1;
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++e;
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}
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} else {
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a <<= (DBL_MANT_DIG - sd);
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}
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double_bits fb;
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fb.u.s.high = ((su_int)(e + 1023) << 20) | ((su_int)(a >> 32) & 0x000FFFFF);
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fb.u.s.low = (su_int)a;
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return fb.f;
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}
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#endif
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