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05a4212cc7
Use of long double can be error-prone since it could be one of 80-bit extended precision float, IEEE 128-bit float, or IBM 128-bit float. Instead use an explicit xf_float typedef for the remaining cases where long double is being used in the implementation. This patch does not touch the PPC specializations which still use long double.
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
//===-- fixunsxfdi.c - Implement __fixunsxfdi -----------------------------===//
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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 __fixunsxfdi for the compiler_rt library.
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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 unsigned long long, rounding toward zero.
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// Negative values all become zero.
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// Assumption: long double is an intel 80 bit floating point type padded with 6
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// bytes du_int is a 64 bit integral type value in long double is representable
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// in du_int or is negative (no range checking performed)
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// gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee
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// eeee | 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm
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// mmmm mmmm mmmm
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#if defined(_MSC_VER) && !defined(__clang__)
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// MSVC throws a warning about 'uninitialized variable use' here,
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// disable it for builds that warn-as-error
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#pragma warning(push)
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#pragma warning(disable : 4700)
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#endif
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COMPILER_RT_ABI du_int __fixunsxfdi(xf_float a) {
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xf_bits fb;
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fb.f = a;
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int e = (fb.u.high.s.low & 0x00007FFF) - 16383;
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if (e < 0 || (fb.u.high.s.low & 0x00008000))
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return 0;
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if ((unsigned)e > sizeof(du_int) * CHAR_BIT)
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return ~(du_int)0;
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return fb.u.low.all >> (63 - e);
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}
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#if defined(_MSC_VER) && !defined(__clang__)
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#pragma warning(pop)
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#endif
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#endif //!_ARCH_PPC
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