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