[WebAssembly] Add target feature for atomics
Summary:
This tracks the WebAssembly threads feature proposal at
https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md
Differential Revision: https://reviews.llvm.org/D37300
llvm-svn: 312145
diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyInstrFormats.td b/llvm/lib/Target/WebAssembly/WebAssemblyInstrFormats.td
index 5b24984..4f41fcc 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyInstrFormats.td
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyInstrFormats.td
@@ -32,6 +32,10 @@
string asmstr = "", bits<32> inst = -1>
: I<oops, iops, pattern, asmstr, inst>, Requires<[HasSIMD128]>;
+class ATOMIC_I<dag oops, dag iops, list<dag> pattern,
+ string asmstr = "", bits<32> inst = -1>
+ : I<oops, iops, pattern, asmstr, inst>, Requires<[HasAtomics]>;
+
// Unary and binary instructions, for the local types that WebAssembly supports.
multiclass UnaryInt<SDNode node, string name, bits<32> i32Inst, bits<32> i64Inst> {
def _I32 : I<(outs I32:$dst), (ins I32:$src),