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[range-ops] Remove special case for handling bitmasks in casts.

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Now that we can generically handle bitmasks for unary operators,
there's no need to special case them.

gcc/ChangeLog:

	* range-op-mixed.h (class operator_cast): Add update_bitmask.
	* range-op.cc (operator_cast::update_bitmask): New.
	(operator_cast::fold_range): Call update_bitmask.
This commit is contained in:
Aldy Hernandez 2023-07-26 11:00:08 +02:00
parent adbac207e9
commit 8605bd9321
2 changed files with 10 additions and 15 deletions
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2
gcc/range-op-mixed.h
View file

@ -346,6 +346,8 @@ public:
relation_kind lhs_op1_relation (const irange &lhs,
const irange &op1, const irange &op2,
relation_kind) const final override;
void update_bitmask (irange &r, const irange &lh,
const irange &rh) const final override;
private:
bool truncating_cast_p (const irange &inner, const irange &outer) const;
bool inside_domain_p (const wide_int &min, const wide_int &max,

23
gcc/range-op.cc
View file

@ -2881,24 +2881,17 @@ operator_cast::fold_range (irange &r, tree type ATTRIBUTE_UNUSED,
return true;
}
// Update the bitmask. Truncating casts are problematic unless
// the conversion fits in the resulting outer type.
irange_bitmask bm = inner.get_bitmask ();
if (truncating_cast_p (inner, outer)
&& wi::rshift (bm.mask (),
wi::uhwi (TYPE_PRECISION (outer.type ()),
TYPE_PRECISION (inner.type ())),
TYPE_SIGN (inner.type ())) != 0)
return true;
unsigned prec = TYPE_PRECISION (type);
signop sign = TYPE_SIGN (inner.type ());
bm = irange_bitmask (wide_int::from (bm.value (), prec, sign),
wide_int::from (bm.mask (), prec, sign));
r.update_bitmask (bm);
update_bitmask (r, inner, outer);
return true;
}
void
operator_cast::update_bitmask (irange &r, const irange &lh,
const irange &rh) const
{
update_known_bitmask (r, CONVERT_EXPR, lh, rh);
}
bool
operator_cast::op1_range (irange &r, tree type,
const irange &lhs,