divsi3.S revision 263560
1229997Sken/*===-- divsi3.S - 32-bit signed integer divide ---------------------------===// 2229997Sken * 3229997Sken * The LLVM Compiler Infrastructure 4229997Sken * 5229997Sken * This file is dual licensed under the MIT and the University of Illinois Open 6229997Sken * Source Licenses. See LICENSE.TXT for details. 7229997Sken * 8229997Sken *===----------------------------------------------------------------------===// 9229997Sken * 10229997Sken * This file implements the __divsi3 (32-bit signed integer divide) function 11229997Sken * for the ARM architecture as a wrapper around the unsigned routine. 12229997Sken * 13229997Sken *===----------------------------------------------------------------------===*/ 14229997Sken 15229997Sken#include "../assembly.h" 16229997Sken 17229997Sken#define ESTABLISH_FRAME \ 18229997Sken push {r4, r7, lr} ;\ 19229997Sken add r7, sp, #4 20229997Sken#define CLEAR_FRAME_AND_RETURN \ 21229997Sken pop {r4, r7, pc} 22229997Sken 23229997Sken.syntax unified 24229997Sken.align 3 25229997Sken// Ok, APCS and AAPCS agree on 32 bit args, so it's safe to use the same routine. 26229997SkenDEFINE_AEABI_FUNCTION_ALIAS(__aeabi_idiv, __divsi3) 27229997SkenDEFINE_COMPILERRT_FUNCTION(__divsi3) 28229997Sken#if __ARM_ARCH_7S__ 29229997Sken tst r1,r1 30229997Sken beq LOCAL_LABEL(divzero) 31229997Sken sdiv r0, r0, r1 32229997Sken bx lr 33229997SkenLOCAL_LABEL(divzero): 34229997Sken mov r0,#0 35229997Sken bx lr 36229997Sken#else 37229997SkenESTABLISH_FRAME 38229997Sken// Set aside the sign of the quotient. 39229997Sken eor r4, r0, r1 40229997Sken// Take absolute value of a and b via abs(x) = (x^(x >> 31)) - (x >> 31). 41229997Sken eor r2, r0, r0, asr #31 42229997Sken eor r3, r1, r1, asr #31 43229997Sken sub r0, r2, r0, asr #31 44229997Sken sub r1, r3, r1, asr #31 45229997Sken// abs(a) / abs(b) 46229997Sken bl SYMBOL_NAME(__udivsi3) 47229997Sken// Apply sign of quotient to result and return. 48229997Sken eor r0, r0, r4, asr #31 49229997Sken sub r0, r0, r4, asr #31 50229997Sken CLEAR_FRAME_AND_RETURN 51229997Sken#endif 52229997Sken