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stage2: sparc64: Implement airLoop

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This commit is contained in:
Koakuma 2022-05-16 23:03:50 +07:00
parent e4a725c597
commit 8ea80fdf7a
1 changed files with 32 additions and 1 deletions
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33
src/arch/sparc64/CodeGen.zig
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@ -564,7 +564,7 @@ fn genBody(self: *Self, body: []const Air.Inst.Index) InnerError!void {
.is_err => try self.airIsErr(inst),
.is_err_ptr => @panic("TODO try self.airIsErrPtr(inst)"),
.load => try self.airLoad(inst),
.loop => @panic("TODO try self.airLoop(inst)"),
.loop => try self.airLoop(inst),
.not => @panic("TODO try self.airNot(inst)"),
.ptrtoint => @panic("TODO try self.airPtrToInt(inst)"),
.ret => try self.airRet(inst),
@ -1342,6 +1342,17 @@ fn airLoad(self: *Self, inst: Air.Inst.Index) !void {
return self.finishAir(inst, result, .{ ty_op.operand, .none, .none });
}
fn airLoop(self: *Self, inst: Air.Inst.Index) !void {
// A loop is a setup to be able to jump back to the beginning.
const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
const loop = self.air.extraData(Air.Block, ty_pl.payload);
const body = self.air.extra[loop.end .. loop.end + loop.data.body_len];
const start = @intCast(u32, self.mir_instructions.len);
try self.genBody(body);
try self.jump(start);
return self.finishAirBookkeeping();
}
fn airRet(self: *Self, inst: Air.Inst.Index) !void {
const un_op = self.air.instructions.items(.data)[inst].un_op;
const operand = try self.resolveInst(un_op);
@ -2231,6 +2242,26 @@ fn iterateBigTomb(self: *Self, inst: Air.Inst.Index, operand_count: usize) !BigT
};
}
/// Send control flow to `inst`.
fn jump(self: *Self, inst: Mir.Inst.Index) !void {
_ = try self.addInst(.{
.tag = .bpcc,
.data = .{
.branch_predict_int = .{
.cond = .al,
.ccr = .xcc,
.inst = inst,
},
},
});
// TODO find out a way to fill this delay slot
_ = try self.addInst(.{
.tag = .nop,
.data = .{ .nop = {} },
});
}
fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) InnerError!void {
const elem_ty = ptr_ty.elemType();
const elem_size = elem_ty.abiSize(self.target.*);