From 5d61f32887c553415215ceadf44cba1bebc7b9da Mon Sep 17 00:00:00 2001
From: Koakuma <koachan@protonmail.com>
Date: Wed, 1 Jun 2022 19:54:22 +0700
Subject: [PATCH] stage2: sparc64: Implement airSlice

---
 src/arch/sparc64/CodeGen.zig | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/src/arch/sparc64/CodeGen.zig b/src/arch/sparc64/CodeGen.zig
index a195da2318..3accb2b648 100644
--- a/src/arch/sparc64/CodeGen.zig
+++ b/src/arch/sparc64/CodeGen.zig
@@ -517,7 +517,7 @@ fn genBody(self: *Self, body: []const Air.Inst.Index) InnerError!void {
             .shl_sat         => @panic("TODO try self.airShlSat(inst)"),
             .min             => @panic("TODO try self.airMin(inst)"),
             .max             => @panic("TODO try self.airMax(inst)"),
-            .slice           => @panic("TODO try self.airSlice(inst)"),
+            .slice           => try self.airSlice(inst),
 
             .sqrt,
             .sin,
@@ -1647,6 +1647,26 @@ fn airRetPtr(self: *Self, inst: Air.Inst.Index) !void {
     return self.finishAir(inst, .{ .ptr_stack_offset = stack_offset }, .{ .none, .none, .none });
 }
 
+fn airSlice(self: *Self, inst: Air.Inst.Index) !void {
+    const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
+    const bin_op = self.air.extraData(Air.Bin, ty_pl.payload).data;
+    const result: MCValue = if (self.liveness.isUnused(inst)) .dead else result: {
+        const ptr = try self.resolveInst(bin_op.lhs);
+        const ptr_ty = self.air.typeOf(bin_op.lhs);
+        const len = try self.resolveInst(bin_op.rhs);
+        const len_ty = self.air.typeOf(bin_op.rhs);
+
+        const ptr_bits = self.target.cpu.arch.ptrBitWidth();
+        const ptr_bytes = @divExact(ptr_bits, 8);
+
+        const stack_offset = try self.allocMem(inst, ptr_bytes * 2, ptr_bytes * 2);
+        try self.genSetStack(ptr_ty, stack_offset, ptr);
+        try self.genSetStack(len_ty, stack_offset - ptr_bytes, len);
+        break :result MCValue{ .stack_offset = stack_offset };
+    };
+    return self.finishAir(inst, result, .{ bin_op.lhs, bin_op.rhs, .none });
+}
+
 fn airSliceElemVal(self: *Self, inst: Air.Inst.Index) !void {
     const is_volatile = false; // TODO
     const bin_op = self.air.instructions.items(.data)[inst].bin_op;