stage2: Implement `@bitReverse` and `@byteSwap`

This change implements the above built-ins for Sema and the LLVM
backend. Other backends have had placeholders added for lowering.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/arch/aarch64/CodeGen.zig b/src/arch/aarch64/CodeGen.zig
index 6e83ad72d1..cef59afd09 100644
--- a/src/arch/aarch64/CodeGen.zig
+++ b/src/arch/aarch64/CodeGen.zig
@@ -621,6 +621,8 @@ fn genBody(self: *Self, body: []const Air.Inst.Index) InnerError!void {
             .clz             => try self.airClz(inst),
             .ctz             => try self.airCtz(inst),
             .popcount        => try self.airPopcount(inst),
+            .byte_swap       => try self.airByteSwap(inst),
+            .bit_reverse     => try self.airBitReverse(inst),
             .tag_name        => try self.airTagName(inst),
             .error_name      => try self.airErrorName(inst),
             .splat           => try self.airSplat(inst),
@@ -1682,6 +1684,18 @@ fn airPopcount(self: *Self, inst: Air.Inst.Index) !void {
     return self.finishAir(inst, result, .{ ty_op.operand, .none, .none });
 }
 
+fn airByteSwap(self: *Self, inst: Air.Inst.Index) !void {
+    const ty_op = self.air.instructions.items(.data)[inst].ty_op;
+    const result: MCValue = if (self.liveness.isUnused(inst)) .dead else return self.fail("TODO implement airByteSwap for {}", .{self.target.cpu.arch});
+    return self.finishAir(inst, result, .{ ty_op.operand, .none, .none });
+}
+
+fn airBitReverse(self: *Self, inst: Air.Inst.Index) !void {
+    const ty_op = self.air.instructions.items(.data)[inst].ty_op;
+    const result: MCValue = if (self.liveness.isUnused(inst)) .dead else return self.fail("TODO implement airBitReverse for {}", .{self.target.cpu.arch});
+    return self.finishAir(inst, result, .{ ty_op.operand, .none, .none });
+}
+
 fn airUnaryMath(self: *Self, inst: Air.Inst.Index) !void {
     const un_op = self.air.instructions.items(.data)[inst].un_op;
     const result: MCValue = if (self.liveness.isUnused(inst))