diff options
Diffstat (limited to 'gcc/builtins.c')
| -rw-r--r-- | gcc/builtins.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/gcc/builtins.c b/gcc/builtins.c index ba0655b..4b177c4 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -5376,6 +5376,7 @@ expand_builtin_atomic_compare_exchange (enum machine_mode mode, tree exp, expect = expand_normal (CALL_EXPR_ARG (exp, 1)); expect = convert_memory_address (Pmode, expect); + expect = gen_rtx_MEM (mode, expect); desired = expand_expr_force_mode (CALL_EXPR_ARG (exp, 2), mode); weak = CALL_EXPR_ARG (exp, 3); @@ -5383,14 +5384,15 @@ expand_builtin_atomic_compare_exchange (enum machine_mode mode, tree exp, if (host_integerp (weak, 0) && tree_low_cst (weak, 0) != 0) is_weak = true; - oldval = copy_to_reg (gen_rtx_MEM (mode, expect)); - + oldval = expect; if (!expand_atomic_compare_and_swap ((target == const0_rtx ? NULL : &target), &oldval, mem, oldval, desired, is_weak, success, failure)) return NULL_RTX; - emit_move_insn (gen_rtx_MEM (mode, expect), oldval); + if (oldval != expect) + emit_move_insn (expect, oldval); + return target; } |