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Add -integer-division-by-zero:all-bits

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This commit is contained in:
gingerBill
2025-08-10 18:29:08 +01:00
parent b6e0b48481
commit 8df69c95c3
4 changed files with 59 additions and 11 deletions
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31
src/check_expr.cpp
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@@ -4377,12 +4377,23 @@ gb_internal void check_binary_expr(CheckerContext *c, Operand *x, Ast *node, Typ
b.kind == ExactValue_Integer && big_int_is_zero(&b.value_integer) &&
(op.kind == Token_QuoEq || op.kind == Token_Mod || op.kind == Token_ModMod)) {
if (op.kind == Token_QuoEq) {
if (zero_behaviour == IntegerDivisionByZero_Zero) {
switch (zero_behaviour) {
case IntegerDivisionByZero_Zero:
// x/0 == 0
x->value = b;
} else {
break;
case IntegerDivisionByZero_Self:
// x/0 == x
x->value = a;
break;
case IntegerDivisionByZero_AllBits:
// x/0 == 0b111...111
if (is_type_untyped(x->type)) {
x->value = exact_value_i64(-1);
} else {
x->value = exact_unary_operator_value(Token_Xor, b, cast(i32)(8*type_size_of(x->type)), is_type_unsigned(x->type));
}
break;
}
} else {
/*
@@ -4391,16 +4402,21 @@ gb_internal void check_binary_expr(CheckerContext *c, Operand *x, Ast *node, Typ
truncated: r = a - b*trunc(a/b)
floored: r = a - b*floor(a/b)
IFF a/0 == 0, then (a%0 == a) or (a%%0 == a)
IFF a/0 == a, then (a%0 == 0) or (a%%0 == 0)
IFF a/0 == 0, then (a%0 == a) or (a%%0 == a)
IFF a/0 == a, then (a%0 == 0) or (a%%0 == 0)
IFF a/0 == 0b111..., then (a%0 == a) or (a%%0 == a)
*/
if (zero_behaviour == IntegerDivisionByZero_Zero) {
switch (zero_behaviour) {
case IntegerDivisionByZero_Zero:
case IntegerDivisionByZero_AllBits:
// x%0 == x
x->value = a;
} else {
break;
case IntegerDivisionByZero_Self:
// x%0 == 0
x->value = b;
break;
}
}
} else {
@@ -9670,6 +9686,9 @@ gb_internal IntegerDivisionByZeroKind check_for_integer_division_by_zero(Checker
if ((flags & OptInFeatureFlag_IntegerDivisionByZero_Self) != 0) {
return IntegerDivisionByZero_Self;
}
if ((flags & OptInFeatureFlag_IntegerDivisionByZero_AllBits) != 0) {
return IntegerDivisionByZero_AllBits;
}
return build_context.integer_division_by_zero_behaviour;
}