ef8821e5db
It seems there have only been a small amount to the compiler-rt source code in the mean time. I'd rather have the code in sync as much as possible by the time we release 9.0. Changes: - The libcompiler_rt library is now dual licensed under both the University of Illinois "BSD-Like" license and the MIT license. - Our local modifications for using .hidden instead of .private_extern have been upstreamed, meaning our changes to lib/assembly.h can now be reverted. - A possible endless recursion in __modsi3() has been fixed. - Support for ARM EABI has been added, but it has no effect on FreeBSD (yet). - The functions __udivmodsi4 and __divmodsi4 have been added. Requested by: many, including bf@ and Pedro Giffuni
35 lines
1.2 KiB
C
35 lines
1.2 KiB
C
/* ===-- divsi3.c - Implement __divsi3 -------------------------------------===
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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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*
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* This file implements __divsi3 for the compiler_rt library.
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*
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* ===----------------------------------------------------------------------===
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*/
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#include "abi.h"
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#include "int_lib.h"
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su_int COMPILER_RT_ABI __udivsi3(su_int n, su_int d);
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/* Returns: a / b */
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ARM_EABI_FNALIAS(idiv, divsi3);
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COMPILER_RT_ABI si_int
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__divsi3(si_int a, si_int b)
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{
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const int bits_in_word_m1 = (int)(sizeof(si_int) * CHAR_BIT) - 1;
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si_int s_a = a >> bits_in_word_m1; /* s_a = a < 0 ? -1 : 0 */
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si_int s_b = b >> bits_in_word_m1; /* s_b = b < 0 ? -1 : 0 */
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a = (a ^ s_a) - s_a; /* negate if s_a == -1 */
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b = (b ^ s_b) - s_b; /* negate if s_b == -1 */
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s_a ^= s_b; /* sign of quotient */
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return (__udivsi3(a, b) ^ s_a) - s_a; /* negate if s_a == -1 */
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}
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