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sync-ops.h revision 1.1.1.1.4.2 
      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         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