forked from OSchip/llvm-project
59 lines
1.4 KiB
Common Lisp
59 lines
1.4 KiB
Common Lisp
//===-- floatdisf.c - Implement __floatdisf -------------------------------===//
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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 floatdisf.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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float __floatdisf(di_int a) {
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if (a == 0)
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return 0.0F;
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const unsigned N = sizeof(di_int) * 8;
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const di_int s = a >> (N - 1);
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a = (a ^ s) - s;
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int sd = N - clz64(a);
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si_int e = sd - 1;
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if (sd > FLT_MANT_DIG) {
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switch (sd) {
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case FLT_MANT_DIG + 1:
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a <<= 1;
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break;
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case FLT_MANT_DIG + 2:
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break;
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default:
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a = ((du_int)a >> (sd - (FLT_MANT_DIG + 2))) |
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((a & ((du_int)(-1) >> ((N + FLT_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 << FLT_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 <<= (FLT_MANT_DIG - sd);
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}
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float_bits fb;
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fb.u =
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((su_int)s & 0x80000000) | ((e + 127) << 23) | ((su_int)a & 0x007FFFFF);
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return fb.f;
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}
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#endif
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