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stage2: elemPtr for slices

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* Restructure elemPtr a bit
* New AIR instruction: slice_elem_ptr, which returns a pointer to an element of a slice
* Value: adapt elemPtr to work on slices
This commit is contained in:
Robin Voetter
2021-10-21 16:17:21 +02:00
parent 84876fec58
commit 09c7d5aebc
10 changed files with 157 additions and 32 deletions
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10
src/codegen.zig
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@@ -848,6 +848,7 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
.array_elem_val => try self.airArrayElemVal(inst),
.slice_elem_val => try self.airSliceElemVal(inst),
.slice_elem_ptr => try self.airSliceElemPtr(inst),
.ptr_elem_val => try self.airPtrElemVal(inst),
.ptr_elem_ptr => try self.airPtrElemPtr(inst),
@@ -1533,6 +1534,15 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
return self.finishAir(inst, result, .{ bin_op.lhs, bin_op.rhs, .none });
}
fn airSliceElemPtr(self: *Self, inst: Air.Inst.Index) !void {
const ty_pl = self.air.instructions.items(.data)[inst].ty_pl;
const extra = self.air.extraData(Air.Bin, ty_pl.payload).data;
const result: MCValue = if (self.liveness.isUnused(inst)) .dead else switch (arch) {
else => return self.fail("TODO implement slice_elem_ptr for {}", .{self.target.cpu.arch}),
};
return self.finishAir(inst, result, .{ extra.lhs, extra.rhs, .none });
}
fn airArrayElemVal(self: *Self, inst: Air.Inst.Index) !void {
const bin_op = self.air.instructions.items(.data)[inst].bin_op;
const result: MCValue = if (self.liveness.isUnused(inst)) .dead else switch (arch) {