diff --git a/src/stage1/ir.cpp b/src/stage1/ir.cpp index 3fea4ed7f0..91fb81c24a 100644 --- a/src/stage1/ir.cpp +++ b/src/stage1/ir.cpp @@ -28880,6 +28880,10 @@ static IrInstGen *ir_analyze_instruction_overflow_op(IrAnalyze *ira, IrInstSrcOv if (type_is_invalid(casted_result_ptr->value->type)) return ira->codegen->invalid_inst_gen; + // Don't write anything to the result pointer. + if (dest_type->data.integral.bit_count == 0) + return ir_const_bool(ira, &instruction->base.base, false); + if (instr_is_comptime(casted_op1) && instr_is_comptime(casted_op2) && instr_is_comptime(casted_result_ptr)) diff --git a/test/stage1/behavior/math.zig b/test/stage1/behavior/math.zig index b13b1ce1e0..68690c9af8 100644 --- a/test/stage1/behavior/math.zig +++ b/test/stage1/behavior/math.zig @@ -109,6 +109,14 @@ test "@shlWithOverflow" { expect(result == 0b1011111111111100); } +test "@*WithOverflow with u0 values" { + var result: u0 = undefined; + expect(!@addWithOverflow(u0, 0, 0, &result)); + expect(!@subWithOverflow(u0, 0, 0, &result)); + expect(!@mulWithOverflow(u0, 0, 0, &result)); + expect(!@shlWithOverflow(u0, 0, 0, &result)); +} + test "@clz" { testClz(); comptime testClz();