| 1 | //===-- sync-ops.h - --===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements outline macros for the __sync_fetch_and_* |
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| 10 | // operations. Different instantiations will generate appropriate assembly for |
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| 11 | // ARM and Thumb-2 versions of the functions. |
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| 12 | // |
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| 13 | //===----------------------------------------------------------------------===// |
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| 14 | |
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| 15 | #include "../assembly.h" |
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| 16 | |
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| 17 | #if __ARM_ARCH >= 7 |
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| 18 | #define DMB dmb |
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| 19 | #elif __ARM_ARCH >= 6 |
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| 20 | #define DMB mcr p15, #0, r0, c7, c10, #5 |
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| 21 | #else |
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| 22 | #error DMB is only supported on ARMv6+ |
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| 23 | #endif |
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| 24 | |
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| 25 | #define SYNC_OP_4(op) \ |
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| 26 | .p2align 2; \ |
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| 27 | .syntax unified; \ |
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| 28 | DEFINE_COMPILERRT_FUNCTION(__sync_fetch_and_##op) \ |
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| 29 | DMB; \ |
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| 30 | mov r12, r0; \ |
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| 31 | LOCAL_LABEL(tryatomic_##op) : ldrex r0, [r12]; \ |
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| 32 | op(r2, r0, r1); \ |
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| 33 | strex r3, r2, [r12]; \ |
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| 34 | cmp r3, #0; \ |
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| 35 | bne LOCAL_LABEL(tryatomic_##op); \ |
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| 36 | DMB; \ |
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| 37 | bx lr |
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| 38 | |
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| 39 | #define SYNC_OP_8(op) \ |
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| 40 | .p2align 2; \ |
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| 41 | .syntax unified; \ |
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| 42 | DEFINE_COMPILERRT_FUNCTION(__sync_fetch_and_##op) \ |
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| 43 | push {r4, r5, r6, lr}; \ |
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| 44 | DMB; \ |
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| 45 | mov r12, r0; \ |
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| 46 | LOCAL_LABEL(tryatomic_##op) : ldrexd r0, r1, [r12]; \ |
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| 47 | op(r4, r5, r0, r1, r2, r3); \ |
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| 48 | strexd r6, r4, r5, [r12]; \ |
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| 49 | cmp r6, #0; \ |
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| 50 | bne LOCAL_LABEL(tryatomic_##op); \ |
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| 51 | DMB; \ |
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| 52 | pop { r4, r5, r6, pc } |
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| 53 | |
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| 54 | #define MINMAX_4(rD, rN, rM, cmp_kind) \ |
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| 55 | cmp rN, rM; \ |
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| 56 | mov rD, rM; \ |
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| 57 | it cmp_kind; \ |
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| 58 | mov##cmp_kind rD, rN |
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| 59 | |
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| 60 | #define MINMAX_8(rD_LO, rD_HI, rN_LO, rN_HI, rM_LO, rM_HI, cmp_kind) \ |
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| 61 | cmp rN_LO, rM_LO; \ |
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| 62 | sbcs rN_HI, rM_HI; \ |
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| 63 | mov rD_LO, rM_LO; \ |
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| 64 | mov rD_HI, rM_HI; \ |
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| 65 | itt cmp_kind; \ |
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| 66 | mov##cmp_kind rD_LO, rN_LO; \ |
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| 67 | mov##cmp_kind rD_HI, rN_HI |
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| 68 | |
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