1*0a6a1f1dSLionel Sambuc/*===-- modsi3.S - 32-bit signed integer modulus --------------------------===// 2*0a6a1f1dSLionel Sambuc * 3*0a6a1f1dSLionel Sambuc * The LLVM Compiler Infrastructure 4*0a6a1f1dSLionel Sambuc * 5*0a6a1f1dSLionel Sambuc * This file is dual licensed under the MIT and the University of Illinois Open 6*0a6a1f1dSLionel Sambuc * Source Licenses. See LICENSE.TXT for details. 7*0a6a1f1dSLionel Sambuc * 8*0a6a1f1dSLionel Sambuc *===----------------------------------------------------------------------===// 9*0a6a1f1dSLionel Sambuc * 10*0a6a1f1dSLionel Sambuc * This file implements the __modsi3 (32-bit signed integer modulus) function 11*0a6a1f1dSLionel Sambuc * for the ARM architecture as a wrapper around the unsigned routine. 12*0a6a1f1dSLionel Sambuc * 13*0a6a1f1dSLionel Sambuc *===----------------------------------------------------------------------===*/ 14*0a6a1f1dSLionel Sambuc 15*0a6a1f1dSLionel Sambuc#include "../assembly.h" 16*0a6a1f1dSLionel Sambuc 17*0a6a1f1dSLionel Sambuc#define ESTABLISH_FRAME \ 18*0a6a1f1dSLionel Sambuc push {r4, r7, lr} ;\ 19*0a6a1f1dSLionel Sambuc add r7, sp, #4 20*0a6a1f1dSLionel Sambuc#define CLEAR_FRAME_AND_RETURN \ 21*0a6a1f1dSLionel Sambuc pop {r4, r7, pc} 22*0a6a1f1dSLionel Sambuc 23*0a6a1f1dSLionel Sambuc .syntax unified 24*0a6a1f1dSLionel Sambuc .text 25*0a6a1f1dSLionel Sambuc#if __ARM_ARCH_ISA_THUMB == 2 26*0a6a1f1dSLionel Sambuc .thumb 27*0a6a1f1dSLionel Sambuc#endif 28*0a6a1f1dSLionel Sambuc 29*0a6a1f1dSLionel Sambuc@ int __modsi3(int divident, int divisor) 30*0a6a1f1dSLionel Sambuc@ Calculate and return the remainder of the (signed) division. 31*0a6a1f1dSLionel Sambuc 32*0a6a1f1dSLionel Sambuc .p2align 3 33*0a6a1f1dSLionel SambucDEFINE_COMPILERRT_FUNCTION(__modsi3) 34*0a6a1f1dSLionel Sambuc#if __ARM_ARCH_EXT_IDIV__ 35*0a6a1f1dSLionel Sambuc tst r1, r1 36*0a6a1f1dSLionel Sambuc beq LOCAL_LABEL(divzero) 37*0a6a1f1dSLionel Sambuc sdiv r2, r0, r1 38*0a6a1f1dSLionel Sambuc mls r0, r2, r1, r0 39*0a6a1f1dSLionel Sambuc bx lr 40*0a6a1f1dSLionel SambucLOCAL_LABEL(divzero): 41*0a6a1f1dSLionel Sambuc mov r0, #0 42*0a6a1f1dSLionel Sambuc bx lr 43*0a6a1f1dSLionel Sambuc#else 44*0a6a1f1dSLionel Sambuc ESTABLISH_FRAME 45*0a6a1f1dSLionel Sambuc // Set aside the sign of the dividend. 46*0a6a1f1dSLionel Sambuc mov r4, r0 47*0a6a1f1dSLionel Sambuc // Take absolute value of a and b via abs(x) = (x^(x >> 31)) - (x >> 31). 48*0a6a1f1dSLionel Sambuc eor r2, r0, r0, asr #31 49*0a6a1f1dSLionel Sambuc eor r3, r1, r1, asr #31 50*0a6a1f1dSLionel Sambuc sub r0, r2, r0, asr #31 51*0a6a1f1dSLionel Sambuc sub r1, r3, r1, asr #31 52*0a6a1f1dSLionel Sambuc // abs(a) % abs(b) 53*0a6a1f1dSLionel Sambuc bl SYMBOL_NAME(__umodsi3) 54*0a6a1f1dSLionel Sambuc // Apply sign of dividend to result and return. 55*0a6a1f1dSLionel Sambuc eor r0, r0, r4, asr #31 56*0a6a1f1dSLionel Sambuc sub r0, r0, r4, asr #31 57*0a6a1f1dSLionel Sambuc CLEAR_FRAME_AND_RETURN 58*0a6a1f1dSLionel Sambuc#endif 59*0a6a1f1dSLionel SambucEND_COMPILERRT_FUNCTION(__modsi3) 60