f6857223c9
WebAssembly is currently using labels to end scopes, so for example a loop scope looks like this: BB0_0: loop BB0_1 ... BB0_1: with BB0_0 being the label of the first block not in the loop. This requires that the label be printed even when it's only reachable via fallthrough. To arrange this, insert a no-op LOOP_END instruction in such cases at the end of the loop. llvm-svn: 253901
62 lines
2.4 KiB
TableGen
62 lines
2.4 KiB
TableGen
//===- WebAssemblyInstrControl.td-WebAssembly control-flow ------*- tablegen -*-
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// \brief WebAssembly control-flow code-gen constructs.
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///
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//===----------------------------------------------------------------------===//
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let isBranch = 1, isTerminator = 1, hasCtrlDep = 1 in {
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def BR_IF : I<(outs), (ins I32:$a, bb_op:$dst),
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[(brcond I32:$a, bb:$dst)],
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"br_if \t$a, $dst">;
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let isBarrier = 1 in {
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def BR : I<(outs), (ins bb_op:$dst),
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[(br bb:$dst)],
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"br \t$dst">;
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} // isBarrier = 1
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} // isBranch = 1, isTerminator = 1, hasCtrlDep = 1
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// TODO: SelectionDAG's lowering insists on using a pointer as the index for
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// jump tables, so in practice we don't ever use TABLESWITCH_I64 in wasm32 mode
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// currently.
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let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in {
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def TABLESWITCH_I32 : I<(outs), (ins I32:$index, variable_ops),
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[(WebAssemblytableswitch I32:$index)],
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"tableswitch\t$index">;
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def TABLESWITCH_I64 : I<(outs), (ins I64:$index, variable_ops),
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[(WebAssemblytableswitch I64:$index)],
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"tableswitch\t$index">;
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} // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1
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// Placemarkers to indicate the start of a block or loop scope.
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def BLOCK : I<(outs), (ins bb_op:$dst), [], "block \t$dst">;
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def LOOP : I<(outs), (ins bb_op:$dst), [], "loop \t$dst">;
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// No-op to indicate to the AsmPrinter that a loop ends here, so a
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// basic block label is needed even if it wouldn't otherwise appear so.
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let isTerminator = 1, hasCtrlDep = 1 in
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def LOOP_END : I<(outs), (ins), []>;
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multiclass RETURN<WebAssemblyRegClass vt> {
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def RETURN_#vt : I<(outs), (ins vt:$val), [(WebAssemblyreturn vt:$val)],
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"return \t$val">;
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}
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let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in {
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let isReturn = 1 in {
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defm : RETURN<I32>;
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defm : RETURN<I64>;
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defm : RETURN<F32>;
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defm : RETURN<F64>;
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def RETURN_VOID : I<(outs), (ins), [(WebAssemblyreturn)], "return">;
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} // isReturn = 1
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def UNREACHABLE : I<(outs), (ins), [(trap)], "unreachable">;
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} // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1
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