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Rework the routines that convert AP[S]Int into a string. Now, instead of

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returning an std::string by value, it fills in a SmallString/SmallVector
passed in.  This significantly reduces string thrashing in some cases.

More specifically, this:
 - Adds an operator<< and a print method for APInt that allows you to 
   directly send them to an ostream.
 - Reimplements APInt::toString to be much simpler and more efficient
   algorithmically in addition to not thrashing strings quite as much.

This speeds up llvm-dis on kc++ by 7%, and may also slightly speed up the
asmprinter.  This also fixes a bug I introduced into the asmwriter in a
previous patch w.r.t. alias printing.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54873 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-08-17 07:19:36 +00:00
parent b6c8a4098f
commit fad86b003a
13 changed files with 170 additions and 140 deletions
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18
include/llvm/ADT/APSInt.h
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@@ -19,7 +19,6 @@
namespace llvm {
class APSInt : public APInt {
bool IsUnsigned;
public:
@@ -58,11 +57,16 @@ public:
void setIsUnsigned(bool Val) { IsUnsigned = Val; }
void setIsSigned(bool Val) { IsUnsigned = !Val; }
/// This is used internally to convert an APInt to a string.
/// @brief Converts an APInt to a std::string
std::string toString(uint8_t Radix = 10) const {
/// toString - Append this APSInt to the specified SmallString.
void toString(SmallVectorImpl<char> &Str, unsigned Radix = 10) const {
return APInt::toString(Str, Radix, isSigned());
}
/// toString - Converts an APInt to a std::string. This is an inefficient
/// method, your should prefer passing in a SmallString instead.
std::string toString(unsigned Radix) const {
return APInt::toString(Radix, isSigned());
}
using APInt::toString;
APSInt& extend(uint32_t width) {
if (IsUnsigned)
@@ -235,6 +239,12 @@ public:
void Profile(FoldingSetNodeID& ID) const;
};
inline std::ostream &operator<<(std::ostream &OS, const APSInt &I) {
I.print(OS, I.isSigned());
return OS;
}
} // end namespace llvm
#endif