1 /*===-- divmodsi4.S - 32-bit signed integer divide and modulus ------------===//
3 * The LLVM Compiler Infrastructure
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
8 *===----------------------------------------------------------------------===//
10 * This file implements the __divmodsi4 (32-bit signed integer divide and
11 * modulus) function for the ARM architecture. A naive digit-by-digit
12 * computation is employed for simplicity.
14 *===----------------------------------------------------------------------===*/
16 #include "../assembly.h"
18 #define ESTABLISH_FRAME \
21 #define CLEAR_FRAME_AND_RETURN \
26 DEFINE_COMPILERRT_FUNCTION(__divmodsi4)
28 // Set aside the sign of the quotient and modulus, and the address for the
33 // Take the absolute value of a and b via abs(x) = (x^(x >> 31)) - (x >> 31).
34 eor ip, r0, r0, asr #31
35 eor lr, r1, r1, asr #31
36 sub r0, ip, r0, asr #31
37 sub r1, lr, r1, asr #31
39 bl SYMBOL_NAME(__udivmodsi4)
40 // Apply the sign of quotient and modulus
42 eor r0, r0, r4, asr #31
43 eor r1, r1, r5, asr #31
44 sub r0, r0, r4, asr #31
45 sub r1, r1, r5, asr #31
47 CLEAR_FRAME_AND_RETURN