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sync-ops.h revision 1.1.1.2 
      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         .syntax unified ; \
     22         DEFINE_COMPILERRT_FUNCTION(__sync_fetch_and_ ## op) \
     23         dmb ; \
     24         mov r12, r0 ; \
     25         LOCAL_LABEL(tryatomic_ ## op): \
     26         ldrex r0, [r12] ; \
     27         op(r2, r0, r1) ; \
     28         strex r3, r2, [r12] ; \
     29         cmp r3, #0 ; \
     30         bne LOCAL_LABEL(tryatomic_ ## op) ; \
     31         dmb ; \
     32         bx lr
     33 
     34 #define SYNC_OP_8(op) \
     35         .p2align 2 ; \
     36         .thumb ; \
     37         .syntax unified ; \
     38         DEFINE_COMPILERRT_FUNCTION(__sync_fetch_and_ ## op) \
     39         push {r4, r5, r6, lr} ; \
     40         dmb ; \
     41         mov r12, r0 ; \
     42         LOCAL_LABEL(tryatomic_ ## op): \
     43         ldrexd r0, r1, [r12] ; \
     44         op(r4, r5, r0, r1, r2, r3) ; \
     45         strexd r6, r4, r5, [r12] ; \
     46         cmp r6, #0 ; \
     47         bne LOCAL_LABEL(tryatomic_ ## op) ; \
     48         dmb ; \
     49         pop {r4, r5, r6, pc}
     50 
     51 #define MINMAX_4(rD, rN, rM, cmp_kind) \
     52         cmp rN, rM ; \
     53         mov rD, rM ; \
     54         it cmp_kind ; \
     55         mov##cmp_kind rD, rN
     56 
     57 #define MINMAX_8(rD_LO, rD_HI, rN_LO, rN_HI, rM_LO, rM_HI, cmp_kind) \
     58         cmp rN_LO, rM_LO ; \
     59         sbcs rN_HI, rM_HI ; \
     60         mov rD_LO, rM_LO ; \
     61         mov rD_HI, rM_HI ; \
     62         itt cmp_kind ; \
     63         mov##cmp_kind rD_LO, rN_LO ; \
     64         mov##cmp_kind rD_HI, rN_HI
     65