wasm: add atomics opcodes and refactoring

This adds the atomic opcodes for the Threads proposal to the
WebAssembly specification: https://github.com/WebAssembly/threads

PrefixedOpcode has been renamed to MiscOpcode as there's multiple
types of prefixed opcodes. This naming is similar to other tools
such as LLVM. As we now use the 0xFE prefix, we moved the
function_index MIR instruction as it was occupying the same value.
This commit includes renaming all related opcodes.

1 files changed, 7 insertions, 7 deletions

diff --git a/src/arch/wasm/CodeGen.zig b/src/arch/wasm/CodeGen.zig
index e79129ddb8..c05f07a602 100644
--- a/src/arch/wasm/CodeGen.zig
+++ b/src/arch/wasm/CodeGen.zig
@@ -895,10 +895,10 @@ fn addTag(func: *CodeGen, tag: Mir.Inst.Tag) error{OutOfMemory}!void {
     try func.addInst(.{ .tag = tag, .data = .{ .tag = {} } });
 }
 
-fn addExtended(func: *CodeGen, opcode: wasm.PrefixedOpcode) error{OutOfMemory}!void {
+fn addExtended(func: *CodeGen, opcode: wasm.MiscOpcode) error{OutOfMemory}!void {
     const extra_index = @intCast(u32, func.mir_extra.items.len);
     try func.mir_extra.append(func.gpa, @enumToInt(opcode));
-    try func.addInst(.{ .tag = .extended, .data = .{ .payload = extra_index } });
+    try func.addInst(.{ .tag = .misc_prefix, .data = .{ .payload = extra_index } });
 }
 
 fn addLabel(func: *CodeGen, tag: Mir.Inst.Tag, label: u32) error{OutOfMemory}!void {
@@ -925,7 +925,7 @@ fn addImm128(func: *CodeGen, index: u32) error{OutOfMemory}!void {
     try func.mir_extra.ensureUnusedCapacity(func.gpa, 5);
     func.mir_extra.appendAssumeCapacity(std.wasm.simdOpcode(.v128_const));
     func.mir_extra.appendSliceAssumeCapacity(@alignCast(4, mem.bytesAsSlice(u32, &simd_values)));
-    try func.addInst(.{ .tag = .simd, .data = .{ .payload = extra_index } });
+    try func.addInst(.{ .tag = .simd_prefix, .data = .{ .payload = extra_index } });
 }
 
 fn addFloat64(func: *CodeGen, float: f64) error{OutOfMemory}!void {
@@ -2310,7 +2310,7 @@ fn store(func: *CodeGen, lhs: WValue, rhs: WValue, ty: Type, offset: u32) InnerE
                     offset + lhs.offset(),
                     ty.abiAlignment(func.target),
                 });
-                return func.addInst(.{ .tag = .simd, .data = .{ .payload = extra_index } });
+                return func.addInst(.{ .tag = .simd_prefix, .data = .{ .payload = extra_index } });
             },
         },
         .Pointer => {
@@ -2420,7 +2420,7 @@ fn load(func: *CodeGen, operand: WValue, ty: Type, offset: u32) InnerError!WValu
             offset + operand.offset(),
             ty.abiAlignment(func.target),
         });
-        try func.addInst(.{ .tag = .simd, .data = .{ .payload = extra_index } });
+        try func.addInst(.{ .tag = .simd_prefix, .data = .{ .payload = extra_index } });
         return WValue{ .stack = {} };
     }
 
@@ -4477,7 +4477,7 @@ fn airSplat(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
                     operand.offset(),
                     elem_ty.abiAlignment(func.target),
                 });
-                try func.addInst(.{ .tag = .simd, .data = .{ .payload = extra_index } });
+                try func.addInst(.{ .tag = .simd_prefix, .data = .{ .payload = extra_index } });
                 try func.addLabel(.local_set, result.local.value);
                 return func.finishAir(inst, result, &.{ty_op.operand});
             },
@@ -4493,7 +4493,7 @@ fn airSplat(func: *CodeGen, inst: Air.Inst.Index) InnerError!void {
                 try func.emitWValue(operand);
                 const extra_index = @intCast(u32, func.mir_extra.items.len);
                 try func.mir_extra.append(func.gpa, opcode);
-                try func.addInst(.{ .tag = .simd, .data = .{ .payload = extra_index } });
+                try func.addInst(.{ .tag = .simd_prefix, .data = .{ .payload = extra_index } });
                 try func.addLabel(.local_set, result.local.value);
                 return func.finishAir(inst, result, &.{ty_op.operand});
             },