1 /*===-- sync-ops.h - --===// 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is dual licensed under the MIT and the University of Illinois Open 6 * Source Licenses. See LICENSE.TXT for details. 7 * 8 *===----------------------------------------------------------------------===// 9 * 10 * This file implements outline macros for the __sync_fetch_and_* 11 * operations. Different instantiations will generate appropriate assembly for 12 * ARM and Thumb-2 versions of the functions. 13 * 14 *===----------------------------------------------------------------------===*/ 15 16 #include "../assembly.h" 17 18 #define SYNC_OP_4(op) \ 19 .p2align 2 ; \ 20 .thumb ; \ 21 .syntax unified ; \ 22 DEFINE_COMPILERRT_THUMB_FUNCTION(__sync_fetch_and_ ## op) \ 23 dmb ; \ 24 mov r12, r0 ; \ 25 LOCAL_LABEL(tryatomic_ ## op): \ 26 ldrex r0, [r12] ; \ 27 op(r2, r0, r1) ; \ 28 strex r3, r2, [r12] ; \ 29 cmp r3, #0 ; \ 30 bne LOCAL_LABEL(tryatomic_ ## op) ; \ 31 dmb ; \ 32 bx lr 33 34 #define SYNC_OP_8(op) \ 35 .p2align 2 ; \ 36 .thumb ; \ 37 .syntax unified ; \ 38 DEFINE_COMPILERRT_THUMB_FUNCTION(__sync_fetch_and_ ## op) \ 39 push {r4, r5, r6, lr} ; \ 40 dmb ; \ 41 mov r12, r0 ; \ 42 LOCAL_LABEL(tryatomic_ ## op): \ 43 ldrexd r0, r1, [r12] ; \ 44 op(r4, r5, r0, r1, r2, r3) ; \ 45 strexd r6, r4, r5, [r12] ; \ 46 cmp r6, #0 ; \ 47 bne LOCAL_LABEL(tryatomic_ ## op) ; \ 48 dmb ; \ 49 pop {r4, r5, r6, pc} 50 51 #define MINMAX_4(rD, rN, rM, cmp_kind) \ 52 cmp rN, rM ; \ 53 mov rD, rM ; \ 54 it cmp_kind ; \ 55 mov##cmp_kind rD, rN 56 57 #define MINMAX_8(rD_LO, rD_HI, rN_LO, rN_HI, rM_LO, rM_HI, cmp_kind) \ 58 cmp rN_LO, rM_LO ; \ 59 sbcs rN_HI, rM_HI ; \ 60 mov rD_LO, rM_LO ; \ 61 mov rD_HI, rM_HI ; \ 62 itt cmp_kind ; \ 63 mov##cmp_kind rD_LO, rN_LO ; \ 64 mov##cmp_kind rD_HI, rN_HI 65
