On 11/08/2015 11:20 PM, Bin.Cheng wrote:
Hi,
I used below code snippet to generate jump_table_data:
//setup label refs
start_sequence ();
emit_jump_table_data(gen_rtx_
ADDR_DIFF_VEC (CASE_VECTOR_MODE,
base_label_ref,
label_refs...))
insns = get_insns ();
end_sequence ();
split_edge_and_insert (edge, insns);
Don't put it onto a sequence and see if that helps.
But later on GCC exited with below error message:
xxx.c:15:1: error: unrecognizable insn:
}
^
(insn 187 109 113 3 (jump_table_data 185 0 0 (addr_diff_vec:DI
(label_ref:DI 184)
[
(label_ref:DI 178)
(label_ref:DI 179)
(label_ref:DI 180)
(label_ref:DI 181)
(label_ref:DI 182)
(label_ref:DI 183)
(label_ref:DI 184)
]
(const_int 0 [0])
(const_int 0 [0]))) -1
(nil))
xxx.c:15:1: internal compiler error: in extract_insn, at recog.c:2286
You don't want the outer insn.
Seems what GCC expecting is as below:
(jump_table_data 185 0 0 (addr_diff_vec:DI (label_ref:DI 184)
[
(label_ref:DI 178)
(label_ref:DI 179)
(label_ref:DI 180)
(label_ref:DI 181)
(label_ref:DI 182)
(label_ref:DI 183)
(label_ref:DI 184)
]
(const_int 0 [0])
(const_int 0 [0])))
Right.
/
The outer insn structure is created in emit_insn_after and make_insn_raw.
I looked into stmt.c:emit_case_dispatch_table, seems GCC used
record_insns there, and it only inserts insn to list, and does not
create the outer insn structure.
Since record_insns/record_insns_nobb are deprecated according to
comments, my question is how to generate jump_table_data then? Is
jump_table_data not supported in emit_insn_*?
I presume you mean reorder_insns not record_insns :-)
I'd start by using reorder_insns to make sure you have your other logic
right, then look to eliminate its use.
jeff
