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https://github.com/jart/cosmopolitan.git
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7e0a09feec
This change ports APE Loader to Linux AARCH64, so that Raspberry Pi users can run programs like redbean, without the executable needing to modify itself. Progress has also slipped into this change on the issue of making progress better conforming to user expectations and industry standards regarding which symbols we're allowed to declare
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/* clang-format off */
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/* ===-- multi3.c - Implement __multi3 -------------------------------------===
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*
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* The LLVM Compiler Infrastructure
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*
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* This file is dual licensed under the MIT and the University of Illinois Open
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* Source Licenses. See LICENSE.TXT for details.
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*
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* ===----------------------------------------------------------------------===
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__static_yoink("huge_compiler_rt_license");
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* This file implements __multi3 for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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#include "third_party/compiler_rt/int_lib.h"
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#ifdef CRT_HAS_128BIT
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/* Returns: a * b */
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static
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ti_int
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__mulddi3(du_int a, du_int b)
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{
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twords r;
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const int bits_in_dword_2 = (int)(sizeof(di_int) * CHAR_BIT) / 2;
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const du_int lower_mask = (du_int)~0 >> bits_in_dword_2;
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r.s.low = (a & lower_mask) * (b & lower_mask);
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du_int t = r.s.low >> bits_in_dword_2;
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r.s.low &= lower_mask;
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t += (a >> bits_in_dword_2) * (b & lower_mask);
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r.s.low += (t & lower_mask) << bits_in_dword_2;
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r.s.high = t >> bits_in_dword_2;
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t = r.s.low >> bits_in_dword_2;
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r.s.low &= lower_mask;
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t += (b >> bits_in_dword_2) * (a & lower_mask);
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r.s.low += (t & lower_mask) << bits_in_dword_2;
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r.s.high += t >> bits_in_dword_2;
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r.s.high += (a >> bits_in_dword_2) * (b >> bits_in_dword_2);
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return r.all;
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}
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/* Returns: a * b */
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COMPILER_RT_ABI ti_int
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__multi3(ti_int a, ti_int b)
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{
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twords x;
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x.all = a;
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twords y;
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y.all = b;
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twords r;
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r.all = __mulddi3(x.s.low, y.s.low);
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r.s.high += x.s.high * y.s.low + x.s.low * y.s.high;
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return r.all;
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}
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#endif /* CRT_HAS_128BIT */
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