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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         DEFINE_COMPILERRT_FUNCTION(__sync_fetch_and_ ## op) \
22         dmb ; \
23         mov r12, r0 ; \
24         LOCAL_LABEL(tryatomic_ ## op): \
25         ldrex r0, [r12] ; \
26         op(r2, r0, r1) ; \
27         strex r3, r2, [r12] ; \
28         cbnz r3, LOCAL_LABEL(tryatomic_ ## op) ; \
29         dmb ; \
30         bx lr
31 
32 #define SYNC_OP_8(op) \
33         .p2align 2 ; \
34         .thumb ; \
35         DEFINE_COMPILERRT_FUNCTION(__sync_fetch_and_ ## op) \
36         push {r4, r5, r6, lr} ; \
37         dmb ; \
38         mov r12, r0 ; \
39         LOCAL_LABEL(tryatomic_ ## op): \
40         ldrexd r0, r1, [r12] ; \
41         op(r4, r5, r0, r1, r2, r3) ; \
42         strexd r6, r4, r5, [r12] ; \
43         cbnz r6, LOCAL_LABEL(tryatomic_ ## op) ; \
44         dmb ; \
45         pop {r4, r5, r6, pc}
46 
47 #define MINMAX_4(rD, rN, rM, cmp_kind) \
48         cmp rN, rM ; \
49         mov rD, rM ; \
50         it cmp_kind ; \
51         mov##cmp_kind rD, rN
52 
53 #define MINMAX_8(rD_LO, rD_HI, rN_LO, rN_HI, rM_LO, rM_HI, cmp_kind) \
54         cmp rN_LO, rM_LO ; \
55         sbcs rN_HI, rM_HI ; \
56         mov rD_LO, rM_LO ; \
57         mov rD_HI, rM_HI ; \
58         itt cmp_kind ; \
59         mov##cmp_kind rD_LO, rN_LO ; \
60         mov##cmp_kind rD_HI, rN_HI
61