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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.
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
//===-- fixxfti.c - Implement __fixxfti -----------------------------------===//
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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 __fixxfti for the compiler_rt library.
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//
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//===----------------------------------------------------------------------===//
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#include "int_lib.h"
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#ifdef CRT_HAS_128BIT
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// Returns: convert a to a signed long long, rounding toward zero.
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// Assumption: long double is an intel 80 bit floating point type padded with 6
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// bytes ti_int is a 128 bit integral type value in long double is representable
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// in ti_int
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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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COMPILER_RT_ABI ti_int __fixxfti(xf_float a) {
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const ti_int ti_max = (ti_int)((~(tu_int)0) / 2);
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const ti_int ti_min = -ti_max - 1;
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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)
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return 0;
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ti_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15);
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ti_int r = fb.u.low.all;
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if ((unsigned)e >= sizeof(ti_int) * CHAR_BIT)
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return a > 0 ? ti_max : ti_min;
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if (e > 63)
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r <<= (e - 63);
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else
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r >>= (63 - e);
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return (r ^ s) - s;
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}
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#endif // CRT_HAS_128BIT
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