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llvm: implement union_init for packed unions

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Closes #13664
This commit is contained in:
Veikka Tuominen
2022-11-27 15:37:48 +02:00
parent 34be5784a3
commit 6f9c7e33b9
3 changed files with 43 additions and 0 deletions
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15
src/codegen/llvm.zig
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@@ -9228,6 +9228,21 @@ pub const FuncGen = struct {
const target = self.dg.module.getTarget();
const layout = union_ty.unionGetLayout(target);
const union_obj = union_ty.cast(Type.Payload.Union).?.data;
if (union_obj.layout == .Packed) {
const big_bits = union_ty.bitSize(target);
const int_llvm_ty = self.dg.context.intType(@intCast(c_uint, big_bits));
const field = union_obj.fields.values()[extra.field_index];
const non_int_val = try self.resolveInst(extra.init);
const ty_bit_size = @intCast(u16, field.ty.bitSize(target));
const small_int_ty = self.dg.context.intType(ty_bit_size);
const small_int_val = if (field.ty.isPtrAtRuntime())
self.builder.buildPtrToInt(non_int_val, small_int_ty, "")
else
self.builder.buildBitCast(non_int_val, small_int_ty, "");
return self.builder.buildZExtOrBitCast(small_int_val, int_llvm_ty, "");
}
const tag_int = blk: {
const tag_ty = union_ty.unionTagTypeHypothetical();
const union_field_name = union_obj.fields.keys()[extra.field_index];