diff options
Diffstat (limited to 'include/llvm/ADT/APInt.h')
| -rw-r--r-- | include/llvm/ADT/APInt.h | 38 |
1 files changed, 20 insertions, 18 deletions
diff --git a/include/llvm/ADT/APInt.h b/include/llvm/ADT/APInt.h index 56cd3cc..88aa995 100644 --- a/include/llvm/ADT/APInt.h +++ b/include/llvm/ADT/APInt.h @@ -15,7 +15,6 @@ #ifndef LLVM_APINT_H #define LLVM_APINT_H -#include "llvm/Support/DataTypes.h" #include "llvm/Support/MathExtras.h" #include <cassert> #include <climits> @@ -27,12 +26,13 @@ namespace llvm { class Deserializer; class FoldingSetNodeID; class raw_ostream; + class StringRef; template<typename T> class SmallVectorImpl; - /* An unsigned host type used as a single part of a multi-part - bignum. */ + // An unsigned host type used as a single part of a multi-part + // bignum. typedef uint64_t integerPart; const unsigned int host_char_bit = 8; @@ -152,8 +152,7 @@ class APInt { /// This is used by the constructors that take string arguments. /// @brief Convert a char array into an APInt - void fromString(unsigned numBits, const char *strStart, unsigned slen, - uint8_t radix); + void fromString(unsigned numBits, const StringRef &str, uint8_t radix); /// This is used by the toString method to divide by the radix. It simply /// provides a more convenient form of divide for internal use since KnuthDiv @@ -229,17 +228,17 @@ public: /// @brief Construct an APInt of numBits width, initialized as bigVal[]. APInt(unsigned numBits, unsigned numWords, const uint64_t bigVal[]); - /// This constructor interprets the slen characters starting at StrStart as - /// a string in the given radix. The interpretation stops when the first - /// character that is not suitable for the radix is encountered. Acceptable - /// radix values are 2, 8, 10 and 16. It is an error for the value implied by - /// the string to require more bits than numBits. + /// This constructor interprets the string \arg str in the given radix. The + /// interpretation stops when the first character that is not suitable for the + /// radix is encountered, or the end of the string. Acceptable radix values + /// are 2, 8, 10 and 16. It is an error for the value implied by the string to + /// require more bits than numBits. + /// /// @param numBits the bit width of the constructed APInt - /// @param strStart the start of the string to be interpreted - /// @param slen the maximum number of characters to interpret - /// @param radix the radix to use for the conversion + /// @param str the string to be interpreted + /// @param radix the radix to use for the conversion /// @brief Construct an APInt from a string representation. - APInt(unsigned numBits, const char strStart[], unsigned slen, uint8_t radix); + APInt(unsigned numBits, const StringRef &str, uint8_t radix); /// Simply makes *this a copy of that. /// @brief Copy Constructor. @@ -1063,9 +1062,9 @@ public: } /// This method determines how many bits are required to hold the APInt - /// equivalent of the string given by \p str of length \p slen. + /// equivalent of the string given by \arg str. /// @brief Get bits required for string value. - static unsigned getBitsNeeded(const char* str, unsigned slen, uint8_t radix); + static unsigned getBitsNeeded(const StringRef& str, uint8_t radix); /// countLeadingZeros - This function is an APInt version of the /// countLeadingZeros_{32,64} functions in MathExtras.h. It counts the number @@ -1235,6 +1234,11 @@ public: return BitWidth - 1 - countLeadingZeros(); } + /// @returns the ceil log base 2 of this APInt. + unsigned ceilLogBase2() const { + return BitWidth - (*this - 1).countLeadingZeros(); + } + /// @returns the log base 2 of this APInt if its an exact power of two, -1 /// otherwise int32_t exactLogBase2() const { @@ -1426,8 +1430,6 @@ inline raw_ostream &operator<<(raw_ostream &OS, const APInt &I) { return OS; } -std::ostream &operator<<(std::ostream &o, const APInt &I); - namespace APIntOps { /// @brief Determine the smaller of two APInts considered to be signed. |
