[WebAssembly] Make tableswitch's 'default' operand explicit. NFC.

[oota-llvm.git] / lib / Target / WebAssembly / WebAssemblyInstrControl.td

diff --git a/lib/Target/WebAssembly/WebAssemblyInstrControl.td b/lib/Target/WebAssembly/WebAssemblyInstrControl.td
index 5f53e4a00d45cdfc267d68601552e7076a87f594..9a9468bb3909c242c85c04ee0f0445d9a5c544cf 100644 (file)
--- a/lib/Target/WebAssembly/WebAssemblyInstrControl.td
+++ b/lib/Target/WebAssembly/WebAssemblyInstrControl.td
@@ -12,26 +12,67 @@
 ///
 //===----------------------------------------------------------------------===//
 
-/*
- * TODO(jfb): Add the following.
- *
- * block: a fixed-length sequence of statements
- * if: if statement
- * do_while: do while statement, basically a loop with a conditional branch
- * forever: infinite loop statement (like while (1)), basically an unconditional
- *          branch (back to the top of the loop)
- * continue: continue to start of nested loop
- * break: break to end from nested loop or block
- * switch: switch statement with fallthrough
- */
+let Defs = [ARGUMENTS] in {
+
+let isBranch = 1, isTerminator = 1, hasCtrlDep = 1 in {
+// The condition operand is a boolean value which WebAssembly represents as i32.
+def BR_IF : I<(outs), (ins I32:$cond, bb_op:$dst),
+              [(brcond I32:$cond, bb:$dst)],
+               "br_if   \t$cond, $dst">;
+let isCodeGenOnly = 1 in
+def BR_UNLESS : I<(outs), (ins I32:$cond, bb_op:$dst), [],
+                   "br_unless\t$cond, $dst">;
+let isBarrier = 1 in {
+def BR   : I<(outs), (ins bb_op:$dst),
+             [(br bb:$dst)],
+             "br      \t$dst">;
+} // isBarrier = 1
+} // isBranch = 1, isTerminator = 1, hasCtrlDep = 1
+
+} // Defs = [ARGUMENTS]
+
+def : Pat<(brcond (i32 (setne I32:$cond, 0)), bb:$dst),
+          (BR_IF I32:$cond, bb_op:$dst)>;
+def : Pat<(brcond (i32 (seteq I32:$cond, 0)), bb:$dst),
+          (BR_UNLESS I32:$cond, bb_op:$dst)>;
+
+let Defs = [ARGUMENTS] in {
+
+// TODO: SelectionDAG's lowering insists on using a pointer as the index for
+// jump tables, so in practice we don't ever use TABLESWITCH_I64 in wasm32 mode
+// currently.
+let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in {
+def TABLESWITCH_I32 : I<(outs), (ins I32:$index, bb_op:$default, variable_ops),
+                        [(WebAssemblytableswitch I32:$index, bb:$default)],
+                        "tableswitch\t$index, $default">;
+def TABLESWITCH_I64 : I<(outs), (ins I64:$index, bb_op:$default, variable_ops),
+                        [(WebAssemblytableswitch I64:$index, bb:$default)],
+                        "tableswitch\t$index, $default">;
+} // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1
+
+// Placemarkers to indicate the start of a block or loop scope.
+def BLOCK     : I<(outs), (ins bb_op:$dst), [], "block   \t$dst">;
+def LOOP      : I<(outs), (ins bb_op:$dst), [], "loop    \t$dst">;
+
+// No-op to indicate to the AsmPrinter that a loop ends here, so a
+// basic block label is needed even if it wouldn't otherwise appear so.
+let isTerminator = 1, hasCtrlDep = 1 in
+def LOOP_END : I<(outs), (ins), []>;
 
 multiclass RETURN<WebAssemblyRegClass vt> {
-  def RETURN_#vt : I<(outs), (ins vt:$val), [(WebAssemblyreturn vt:$val)]>;
+  def RETURN_#vt : I<(outs), (ins vt:$val), [(WebAssemblyreturn vt:$val)],
+                     "return  \t$val">;
 }
-let isReturn = 1, isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in {
-  defm : RETURN<Int32>;
-  defm : RETURN<Int64>;
-  defm : RETURN<Float32>;
-  defm : RETURN<Float64>;
-  def RETURN_VOID : I<(outs), (ins), [(WebAssemblyreturn)]>;
-} // isReturn = 1, isTerminator = 1, hasCtrlDep = 1, isBarrier = 1
+
+let isTerminator = 1, hasCtrlDep = 1, isBarrier = 1 in {
+let isReturn = 1 in {
+  defm : RETURN<I32>;
+  defm : RETURN<I64>;
+  defm : RETURN<F32>;
+  defm : RETURN<F64>;
+  def RETURN_VOID : I<(outs), (ins), [(WebAssemblyreturn)], "return">;
+} // isReturn = 1
+  def UNREACHABLE : I<(outs), (ins), [(trap)], "unreachable">;
+} // isTerminator = 1, hasCtrlDep = 1, isBarrier = 1
+
+} // Defs = [ARGUMENTS]