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stage1: Fix *WithOverflow intrinsics with u0 values

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Closes #5369
This commit is contained in:
LemonBoy 2020-11-01 22:14:08 +01:00 committed by Andrew Kelley
parent ad9655db3a
commit be26c3bf4e
2 changed files with 12 additions and 0 deletions
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4
src/stage1/ir.cpp
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@ -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))

8
test/stage1/behavior/math.zig
View File

@ -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();