diff options
Diffstat (limited to 'src/codegen/llvm.zig')
| -rw-r--r-- | src/codegen/llvm.zig | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig index 049f7bfad6..431d158293 100644 --- a/src/codegen/llvm.zig +++ b/src/codegen/llvm.zig @@ -6459,6 +6459,34 @@ pub const FuncGen = struct { return vector; }, .Struct => { + if (result_ty.containerLayout() == .Packed) { + const struct_obj = result_ty.castTag(.@"struct").?.data; + const big_bits = struct_obj.packedIntegerBits(target); + const int_llvm_ty = self.dg.context.intType(big_bits); + const fields = struct_obj.fields.values(); + comptime assert(Type.packed_struct_layout_version == 2); + var running_int: *const llvm.Value = int_llvm_ty.constNull(); + var running_bits: u16 = 0; + for (elements) |elem, i| { + const field = fields[i]; + if (!field.ty.hasRuntimeBitsIgnoreComptime()) continue; + + const non_int_val = try self.resolveInst(elem); + 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 = self.builder.buildBitCast(non_int_val, small_int_ty, ""); + const shift_rhs = int_llvm_ty.constInt(running_bits, .False); + // If the field is as large as the entire packed struct, this + // zext would go from, e.g. i16 to i16. This is legal with + // constZExtOrBitCast but not legal with constZExt. + const extended_int_val = self.builder.buildZExtOrBitCast(small_int_val, int_llvm_ty, ""); + const shifted = self.builder.buildShl(extended_int_val, shift_rhs, ""); + running_int = self.builder.buildOr(running_int, shifted, ""); + running_bits += ty_bit_size; + } + return running_int; + } + var ptr_ty_buf: Type.Payload.Pointer = undefined; if (isByRef(result_ty)) { |