mirrors/yosys
3
0
Fork 0
mirror of https://github.com/YosysHQ/yosys synced 2025-07-24 21:27:00 +00:00
Code Activity

Merge pull request #5101 from georgerennie/george/opt_expr_shift_ovfl

Browse source 
opt_expr: fix shift optimization with overflowing shift amount
This commit is contained in:
George Rennie 2025-05-22 15:16:19 +01:00 • committed by GitHub
commit 6331f92d00
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
4 changed files with 168 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

39
kernel/rtlil.h
View file

@ -753,7 +753,26 @@ public:
std::vector<RTLIL::State>& bits();
bool as_bool() const;
// Convert the constant value to a C++ int.
// NOTE: If the constant is too wide to fit in int (32 bits) this will
// truncate any higher bits, potentially over/underflowing. Consider using
// try_as_int, as_int_saturating, or guarding behind convertible_to_int
// instead.
int as_int(bool is_signed = false) const;
// Returns true iff the constant can be converted to an int without
// over/underflow.
bool convertible_to_int(bool is_signed = false) const;
// Returns the constant's value as an int if it can be represented without
// over/underflow, or std::nullopt otherwise.
std::optional<int> try_as_int(bool is_signed = false) const;
// Returns the constant's value as an int if it can be represented without
// over/underflow, otherwise the max/min value for int depending on the sign.
int as_int_saturating(bool is_signed = false) const;
std::string as_string(const char* any = "-") const;
static Const from_string(const std::string &str);
std::vector<RTLIL::State> to_bits() const;
@ -1130,7 +1149,27 @@ public:
bool is_onehot(int *pos = nullptr) const;
bool as_bool() const;
// Convert the SigSpec to a C++ int, assuming all bits are constant.
// NOTE: If the value is too wide to fit in int (32 bits) this will
// truncate any higher bits, potentially over/underflowing. Consider using
// try_as_int, as_int_saturating, or guarding behind convertible_to_int
// instead.
int as_int(bool is_signed = false) const;
// Returns true iff the SigSpec is constant and can be converted to an int
// without over/underflow.
bool convertible_to_int(bool is_signed = false) const;
// Returns the SigSpec's value as an int if it is a constant and can be
// represented without over/underflow, or std::nullopt otherwise.
std::optional<int> try_as_int(bool is_signed = false) const;
// Returns an all constant SigSpec's value as an int if it can be represented
// without over/underflow, otherwise the max/min value for int depending on
// the sign.
int as_int_saturating(bool is_signed = false) const;
std::string as_string() const;
RTLIL::Const as_const() const;
RTLIL::Wire *as_wire() const;