57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* ===-- floatdixf.c - Implement __floatdixf -------------------------------===
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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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* This file implements __floatdixf for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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#if !_ARCH_PPC
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#include "int_lib.h"
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/* Returns: convert a to a long double, rounding toward even. */
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/* Assumption: long double is a IEEE 80 bit floating point type padded to 128 bits
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* di_int is a 64 bit integral type
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*/
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/* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
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* 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
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*/
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COMPILER_RT_ABI long double
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__floatdixf(di_int a)
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{
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if (a == 0)
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return 0.0;
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const unsigned N = sizeof(di_int) * CHAR_BIT;
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const di_int s = a >> (N-1);
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a = (a ^ s) - s;
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int clz = __builtin_clzll(a);
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int e = (N - 1) - clz ; /* exponent */
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long_double_bits fb;
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fb.u.high.s.low = ((su_int)s & 0x00008000) | /* sign */
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(e + 16383); /* exponent */
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fb.u.low.all = a << clz; /* mantissa */
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return fb.f;
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}
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#endif /* !_ARCH_PPC */
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