1//===- WebAssemblyInstrControl.td-WebAssembly control-flow ------*- tablegen -*-
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9///
10/// \file
11/// \brief WebAssembly control-flow code-gen constructs.
12///
13//===----------------------------------------------------------------------===//
14
15let isBranch = 1, isTerminator = 1, hasCtrlDep = 1 in {
16def BR_IF : I<(outs), (ins I32:$a, bb_op:$dst),
17              [(brcond I32:$a, bb:$dst)],
18               "br_if   \t$a, $dst">;
19let isBarrier = 1 in {
20def BR   : I<(outs), (ins bb_op:$dst),
21             [(br bb:$dst)],
22             "br      \t$dst">;
23} // isBarrier = 1
24} // isBranch = 1, isTerminator = 1, hasCtrlDep = 1
25
26// TODO: SelectionDAG's lowering insists on using a pointer as the index for
27// jump tables, so in practice we don't ever use TABLESWITCH_I64 in wasm32 mode
28// currently.
29let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in {
30def TABLESWITCH_I32 : I<(outs), (ins I32:$index, variable_ops),
31                        [(WebAssemblytableswitch I32:$index)],
32                        "tableswitch\t$index">;
33def TABLESWITCH_I64 : I<(outs), (ins I64:$index, variable_ops),
34                        [(WebAssemblytableswitch I64:$index)],
35                        "tableswitch\t$index">;
36} // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1
37
38// Placemarkers to indicate the start of a block or loop scope.
39def BLOCK     : I<(outs), (ins bb_op:$dst), [], "block   \t$dst">;
40def LOOP      : I<(outs), (ins bb_op:$dst), [], "loop    \t$dst">;
41
42// No-op to indicate to the AsmPrinter that a loop ends here, so a
43// basic block label is needed even if it wouldn't otherwise appear so.
44let isTerminator = 1, hasCtrlDep = 1 in
45def LOOP_END : I<(outs), (ins), []>;
46
47multiclass RETURN<WebAssemblyRegClass vt> {
48  def RETURN_#vt : I<(outs), (ins vt:$val), [(WebAssemblyreturn vt:$val)],
49                     "return  \t$val">;
50}
51
52let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in {
53let isReturn = 1 in {
54  defm : RETURN<I32>;
55  defm : RETURN<I64>;
56  defm : RETURN<F32>;
57  defm : RETURN<F64>;
58  def RETURN_VOID : I<(outs), (ins), [(WebAssemblyreturn)], "return">;
59} // isReturn = 1
60  def UNREACHABLE : I<(outs), (ins), [(trap)], "unreachable">;
61} // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1
62