sync-ops.h revision 1.1.1.1 
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