| 1 | //===-- fixunsxfsi.c - Implement __fixunsxfsi -----------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements __fixunsxfsi for the compiler_rt library. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #if !_ARCH_PPC |
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| 14 | |
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| 15 | #include "int_lib.h" |
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| 16 | |
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| 17 | // Returns: convert a to a unsigned int, rounding toward zero. |
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| 18 | // Negative values all become zero. |
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| 19 | |
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| 20 | // Assumption: long double is an intel 80 bit floating point type padded with 6 |
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| 21 | // bytes su_int is a 32 bit integral type value in long double is representable |
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| 22 | // in su_int or is negative |
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| 23 | |
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| 24 | // gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee |
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| 25 | // eeee | 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm |
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| 26 | // mmmm mmmm mmmm |
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| 27 | |
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| 28 | #if defined(_MSC_VER) && !defined(__clang__) |
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| 29 | // MSVC throws a warning about 'uninitialized variable use' here, |
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| 30 | // disable it for builds that warn-as-error |
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| 31 | #pragma warning(push) |
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| 32 | #pragma warning(disable : 4700) |
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| 33 | #endif |
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| 34 | |
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| 35 | COMPILER_RT_ABI su_int __fixunsxfsi(xf_float a) { |
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| 36 | xf_bits fb; |
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| 37 | fb.f = a; |
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| 38 | int e = (fb.u.high.s.low & 0x00007FFF) - 16383; |
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| 39 | if (e < 0 || (fb.u.high.s.low & 0x00008000)) |
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| 40 | return 0; |
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| 41 | if ((unsigned)e > sizeof(su_int) * CHAR_BIT) |
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| 42 | return ~(su_int)0; |
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| 43 | return fb.u.low.s.high >> (31 - e); |
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| 44 | } |
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| 45 | |
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| 46 | #if defined(_MSC_VER) && !defined(__clang__) |
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| 47 | #pragma warning(pop) |
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| 48 | #endif |
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| 49 | |
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| 50 | #endif // !_ARCH_PPC |
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| 51 | |
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