diff options
Diffstat (limited to 'gcc/builtins.c')
| -rw-r--r-- | gcc/builtins.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/gcc/builtins.c b/gcc/builtins.c index 0456a9e..3f32754 100644 --- a/gcc/builtins.c +++ b/gcc/builtins.c @@ -3839,6 +3839,8 @@ expand_builtin_memory_copy_args (tree dest, tree src, tree len, unsigned HOST_WIDE_INT max_size; unsigned HOST_WIDE_INT probable_max_size; + bool is_move_done; + /* If DEST is not a pointer type, call the normal function. */ if (dest_align == 0) return NULL_RTX; @@ -3888,11 +3890,22 @@ expand_builtin_memory_copy_args (tree dest, tree src, tree len, if (CALL_EXPR_TAILCALL (exp) && (retmode == RETURN_BEGIN || target == const0_rtx)) method = BLOCK_OP_TAILCALL; - if (retmode == RETURN_END && target != const0_rtx) + bool use_mempcpy_call = (targetm.libc_has_fast_function (BUILT_IN_MEMPCPY) + && retmode == RETURN_END + && target != const0_rtx); + if (use_mempcpy_call) method = BLOCK_OP_NO_LIBCALL_RET; dest_addr = emit_block_move_hints (dest_mem, src_mem, len_rtx, method, expected_align, expected_size, - min_size, max_size, probable_max_size); + min_size, max_size, probable_max_size, + use_mempcpy_call, &is_move_done); + + /* Bail out when a mempcpy call would be expanded as libcall and when + we have a target that provides a fast implementation + of mempcpy routine. */ + if (!is_move_done) + return NULL_RTX; + if (dest_addr == pc_rtx) return NULL_RTX; |