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/* ===-- divsi3.c - Implement __divsi3 -------------------------------------===
*
* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
* See https://llvm.org/LICENSE.txt for license information.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*
* ===----------------------------------------------------------------------===
*
* This file implements __divsi3 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
/* Returns: a / b */
COMPILER_RT_ABI si_int
__divsi3(si_int a, si_int b)
{
const int bits_in_word_m1 = (int)(sizeof(si_int) * CHAR_BIT) - 1;
si_int s_a = a >> bits_in_word_m1; /* s_a = a < 0 ? -1 : 0 */
si_int s_b = b >> bits_in_word_m1; /* s_b = b < 0 ? -1 : 0 */
a = (a ^ s_a) - s_a; /* negate if s_a == -1 */
b = (b ^ s_b) - s_b; /* negate if s_b == -1 */
s_a ^= s_b; /* sign of quotient */
/*
* On CPUs without unsigned hardware division support,
* this calls __udivsi3 (notice the cast to su_int).
* On CPUs with unsigned hardware division support,
* this uses the unsigned division instruction.
*/
return ((su_int)a/(su_int)b ^ s_a) - s_a; /* negate if s_a == -1 */
}
#if defined(__ARM_EABI__)
AEABI_RTABI si_int __aeabi_idiv(si_int a, si_int b) COMPILER_RT_ALIAS(__divsi3);
#endif
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