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/*===-- sync-ops.h - --===//
*
* The LLVM Compiler Infrastructure
*
* This file is dual licensed under the MIT and the University of Illinois Open
* Source Licenses. See LICENSE.TXT for details.
*
*===----------------------------------------------------------------------===//
*
* This file implements outline macros for the __sync_fetch_and_*
* operations. Different instantiations will generate appropriate assembly for
* ARM and Thumb-2 versions of the functions.
*
*===----------------------------------------------------------------------===*/
#include "../assembly.h"
#define SYNC_OP_4(op) \
.p2align 2 ; \
.thumb ; \
.syntax unified ; \
DEFINE_COMPILERRT_THUMB_FUNCTION(__sync_fetch_and_ ## op) \
dmb ; \
mov r12, r0 ; \
LOCAL_LABEL(tryatomic_ ## op): \
ldrex r0, [r12] ; \
op(r2, r0, r1) ; \
strex r3, r2, [r12] ; \
cmp r3, #0 ; \
bne LOCAL_LABEL(tryatomic_ ## op) ; \
dmb ; \
bx lr
#define SYNC_OP_8(op) \
.p2align 2 ; \
.thumb ; \
.syntax unified ; \
DEFINE_COMPILERRT_THUMB_FUNCTION(__sync_fetch_and_ ## op) \
push {r4, r5, r6, lr} ; \
dmb ; \
mov r12, r0 ; \
LOCAL_LABEL(tryatomic_ ## op): \
ldrexd r0, r1, [r12] ; \
op(r4, r5, r0, r1, r2, r3) ; \
strexd r6, r4, r5, [r12] ; \
cmp r6, #0 ; \
bne LOCAL_LABEL(tryatomic_ ## op) ; \
dmb ; \
pop {r4, r5, r6, pc}
#define MINMAX_4(rD, rN, rM, cmp_kind) \
cmp rN, rM ; \
mov rD, rM ; \
it cmp_kind ; \
mov##cmp_kind rD, rN
#define MINMAX_8(rD_LO, rD_HI, rN_LO, rN_HI, rM_LO, rM_HI, cmp_kind) \
cmp rN_LO, rM_LO ; \
sbcs rN_HI, rM_HI ; \
mov rD_LO, rM_LO ; \
mov rD_HI, rM_HI ; \
itt cmp_kind ; \
mov##cmp_kind rD_LO, rN_LO ; \
mov##cmp_kind rD_HI, rN_HI
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