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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
//===-- fixunsxfsi.c - Implement __fixunsxfsi -----------------------------===//
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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 __fixunsxfsi 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 int, 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 su_int is a 32 bit integral type value in long double is representable
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// in su_int or is negative
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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 su_int __fixunsxfsi(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(su_int) * CHAR_BIT)
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return ~(su_int)0;
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return fb.u.low.s.high >> (31 - 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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