[WebAssembly] Use a physical register to describe ARGUMENT liveness.
Instead of trying to move ARGUMENT instructions back up to the top after
they've been scheduled or sunk down, use a fake physical register to
create a liveness constraint that prevents ARGUMENT instructions from
moving down in the first place. This is still not entirely ideal, however
it is more robust than letting them move and moving them back.
llvm-svn: 254084
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrConv.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrConv.td
index a4ae5fe..a34916e 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrConv.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrConv.td
@@ -13,6 +13,8 @@
///
//===----------------------------------------------------------------------===//
+let Defs = [ARGUMENTS] in {
+
def I32_WRAP_I64 : I<(outs I32:$dst), (ins I64:$src),
[(set I32:$dst, (trunc I64:$src))],
"i32.wrap/i64\t$dst, $src">;
@@ -93,3 +95,5 @@
def F64_REINTERPRET_I64 : I<(outs F64:$dst), (ins I64:$src),
[(set F64:$dst, (bitconvert I64:$src))],
"f64.reinterpret/i64\t$dst, $src">;
+
+} // Defs = [ARGUMENTS]