1*7c3d14c8STreehugger Robot/*===-- divsi3.S - 32-bit signed integer divide ---------------------------===// 2*7c3d14c8STreehugger Robot * 3*7c3d14c8STreehugger Robot * The LLVM Compiler Infrastructure 4*7c3d14c8STreehugger Robot * 5*7c3d14c8STreehugger Robot * This file is dual licensed under the MIT and the University of Illinois Open 6*7c3d14c8STreehugger Robot * Source Licenses. See LICENSE.TXT for details. 7*7c3d14c8STreehugger Robot * 8*7c3d14c8STreehugger Robot *===----------------------------------------------------------------------===// 9*7c3d14c8STreehugger Robot * 10*7c3d14c8STreehugger Robot * This file implements the __divsi3 (32-bit signed integer divide) function 11*7c3d14c8STreehugger Robot * for the ARM architecture as a wrapper around the unsigned routine. 12*7c3d14c8STreehugger Robot * 13*7c3d14c8STreehugger Robot *===----------------------------------------------------------------------===*/ 14*7c3d14c8STreehugger Robot 15*7c3d14c8STreehugger Robot#include "../assembly.h" 16*7c3d14c8STreehugger Robot 17*7c3d14c8STreehugger Robot#define ESTABLISH_FRAME \ 18*7c3d14c8STreehugger Robot push {r4, r7, lr} ;\ 19*7c3d14c8STreehugger Robot add r7, sp, #4 20*7c3d14c8STreehugger Robot#define CLEAR_FRAME_AND_RETURN \ 21*7c3d14c8STreehugger Robot pop {r4, r7, pc} 22*7c3d14c8STreehugger Robot 23*7c3d14c8STreehugger Robot .syntax unified 24*7c3d14c8STreehugger Robot .text 25*7c3d14c8STreehugger Robot#if __ARM_ARCH_ISA_THUMB == 2 26*7c3d14c8STreehugger Robot .thumb 27*7c3d14c8STreehugger Robot#endif 28*7c3d14c8STreehugger Robot 29*7c3d14c8STreehugger Robot .p2align 3 30*7c3d14c8STreehugger Robot// Ok, APCS and AAPCS agree on 32 bit args, so it's safe to use the same routine. 31*7c3d14c8STreehugger RobotDEFINE_AEABI_FUNCTION_ALIAS(__aeabi_idiv, __divsi3) 32*7c3d14c8STreehugger Robot 33*7c3d14c8STreehugger Robot@ int __divsi3(int divident, int divisor) 34*7c3d14c8STreehugger Robot@ Calculate and return the quotient of the (signed) division. 35*7c3d14c8STreehugger Robot 36*7c3d14c8STreehugger Robot#if __ARM_ARCH_ISA_THUMB == 2 37*7c3d14c8STreehugger RobotDEFINE_COMPILERRT_THUMB_FUNCTION(__divsi3) 38*7c3d14c8STreehugger Robot#else 39*7c3d14c8STreehugger RobotDEFINE_COMPILERRT_FUNCTION(__divsi3) 40*7c3d14c8STreehugger Robot#endif 41*7c3d14c8STreehugger Robot#if __ARM_ARCH_EXT_IDIV__ 42*7c3d14c8STreehugger Robot tst r1,r1 43*7c3d14c8STreehugger Robot beq LOCAL_LABEL(divzero) 44*7c3d14c8STreehugger Robot sdiv r0, r0, r1 45*7c3d14c8STreehugger Robot bx lr 46*7c3d14c8STreehugger RobotLOCAL_LABEL(divzero): 47*7c3d14c8STreehugger Robot mov r0,#0 48*7c3d14c8STreehugger Robot bx lr 49*7c3d14c8STreehugger Robot#else 50*7c3d14c8STreehugger RobotESTABLISH_FRAME 51*7c3d14c8STreehugger Robot// Set aside the sign of the quotient. 52*7c3d14c8STreehugger Robot eor r4, r0, r1 53*7c3d14c8STreehugger Robot// Take absolute value of a and b via abs(x) = (x^(x >> 31)) - (x >> 31). 54*7c3d14c8STreehugger Robot eor r2, r0, r0, asr #31 55*7c3d14c8STreehugger Robot eor r3, r1, r1, asr #31 56*7c3d14c8STreehugger Robot sub r0, r2, r0, asr #31 57*7c3d14c8STreehugger Robot sub r1, r3, r1, asr #31 58*7c3d14c8STreehugger Robot// abs(a) / abs(b) 59*7c3d14c8STreehugger Robot bl SYMBOL_NAME(__udivsi3) 60*7c3d14c8STreehugger Robot// Apply sign of quotient to result and return. 61*7c3d14c8STreehugger Robot eor r0, r0, r4, asr #31 62*7c3d14c8STreehugger Robot sub r0, r0, r4, asr #31 63*7c3d14c8STreehugger Robot CLEAR_FRAME_AND_RETURN 64*7c3d14c8STreehugger Robot#endif 65*7c3d14c8STreehugger RobotEND_COMPILERRT_FUNCTION(__divsi3) 66*7c3d14c8STreehugger Robot 67*7c3d14c8STreehugger RobotNO_EXEC_STACK_DIRECTIVE 68*7c3d14c8STreehugger Robot 69