mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-29 13:29:28 +00:00
Microoptimize Twine's with unsigned and int to not pin their value to the stack. This saves stack space in common cases and allows mem2reg in the caller. A simple example is: void foo(const Twine &); void bar(int x) { foo("xyz: " + Twine(x)); } Before: __Z3bari: subq $40, %rsp movl %edi, 36(%rsp) leaq L_.str3(%rip), %rax leaq 36(%rsp), %rcx leaq 8(%rsp), %rdi movq %rax, 8(%rsp) movq %rcx, 16(%rsp) movb $3, 24(%rsp) movb $7, 25(%rsp) callq __Z3fooRKN4llvm5TwineE addq $40, %rsp ret After: __Z3bari: subq $24, %rsp leaq L_.str3(%rip), %rax movq %rax, (%rsp) movslq %edi, %rax movq %rax, 8(%rsp) movb $3, 16(%rsp) movb $7, 17(%rsp) leaq (%rsp), %rdi callq __Z3fooRKN4llvm5TwineE addq $24, %rsp ret It saves 16 bytes of stack and one instruction in this case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103107 91177308-0d34-0410-b5e6-96231b3b80d8
141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
//===-- Twine.cpp - Fast Temporary String Concatenation -------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/ADT/Twine.h"
|
|
#include "llvm/ADT/SmallString.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
using namespace llvm;
|
|
|
|
std::string Twine::str() const {
|
|
SmallString<256> Vec;
|
|
return toStringRef(Vec).str();
|
|
}
|
|
|
|
void Twine::toVector(SmallVectorImpl<char> &Out) const {
|
|
raw_svector_ostream OS(Out);
|
|
print(OS);
|
|
}
|
|
|
|
StringRef Twine::toStringRef(SmallVectorImpl<char> &Out) const {
|
|
if (isSingleStringRef())
|
|
return getSingleStringRef();
|
|
toVector(Out);
|
|
return StringRef(Out.data(), Out.size());
|
|
}
|
|
|
|
void Twine::printOneChild(raw_ostream &OS, const void *Ptr,
|
|
NodeKind Kind) const {
|
|
switch (Kind) {
|
|
case Twine::NullKind: break;
|
|
case Twine::EmptyKind: break;
|
|
case Twine::TwineKind:
|
|
static_cast<const Twine*>(Ptr)->print(OS);
|
|
break;
|
|
case Twine::CStringKind:
|
|
OS << static_cast<const char*>(Ptr);
|
|
break;
|
|
case Twine::StdStringKind:
|
|
OS << *static_cast<const std::string*>(Ptr);
|
|
break;
|
|
case Twine::StringRefKind:
|
|
OS << *static_cast<const StringRef*>(Ptr);
|
|
break;
|
|
case Twine::DecUIKind:
|
|
OS << (unsigned)(uintptr_t)Ptr;
|
|
break;
|
|
case Twine::DecIKind:
|
|
OS << (int)(intptr_t)Ptr;
|
|
break;
|
|
case Twine::DecULKind:
|
|
OS << *static_cast<const unsigned long*>(Ptr);
|
|
break;
|
|
case Twine::DecLKind:
|
|
OS << *static_cast<const long*>(Ptr);
|
|
break;
|
|
case Twine::DecULLKind:
|
|
OS << *static_cast<const unsigned long long*>(Ptr);
|
|
break;
|
|
case Twine::DecLLKind:
|
|
OS << *static_cast<const long long*>(Ptr);
|
|
break;
|
|
case Twine::UHexKind:
|
|
OS.write_hex(*static_cast<const uint64_t*>(Ptr));
|
|
break;
|
|
}
|
|
}
|
|
|
|
void Twine::printOneChildRepr(raw_ostream &OS, const void *Ptr,
|
|
NodeKind Kind) const {
|
|
switch (Kind) {
|
|
case Twine::NullKind:
|
|
OS << "null"; break;
|
|
case Twine::EmptyKind:
|
|
OS << "empty"; break;
|
|
case Twine::TwineKind:
|
|
OS << "rope:";
|
|
static_cast<const Twine*>(Ptr)->printRepr(OS);
|
|
break;
|
|
case Twine::CStringKind:
|
|
OS << "cstring:\""
|
|
<< static_cast<const char*>(Ptr) << "\"";
|
|
break;
|
|
case Twine::StdStringKind:
|
|
OS << "std::string:\""
|
|
<< static_cast<const std::string*>(Ptr) << "\"";
|
|
break;
|
|
case Twine::StringRefKind:
|
|
OS << "stringref:\""
|
|
<< static_cast<const StringRef*>(Ptr) << "\"";
|
|
break;
|
|
case Twine::DecUIKind:
|
|
OS << "decUI:\"" << (unsigned)(uintptr_t)Ptr << "\"";
|
|
break;
|
|
case Twine::DecIKind:
|
|
OS << "decI:\"" << (int)(intptr_t)Ptr << "\"";
|
|
break;
|
|
case Twine::DecULKind:
|
|
OS << "decUL:\"" << *static_cast<const unsigned long*>(Ptr) << "\"";
|
|
break;
|
|
case Twine::DecLKind:
|
|
OS << "decL:\"" << *static_cast<const long*>(Ptr) << "\"";
|
|
break;
|
|
case Twine::DecULLKind:
|
|
OS << "decULL:\"" << *static_cast<const unsigned long long*>(Ptr) << "\"";
|
|
break;
|
|
case Twine::DecLLKind:
|
|
OS << "decLL:\"" << *static_cast<const long long*>(Ptr) << "\"";
|
|
break;
|
|
case Twine::UHexKind:
|
|
OS << "uhex:\"" << static_cast<const uint64_t*>(Ptr) << "\"";
|
|
break;
|
|
}
|
|
}
|
|
|
|
void Twine::print(raw_ostream &OS) const {
|
|
printOneChild(OS, LHS, getLHSKind());
|
|
printOneChild(OS, RHS, getRHSKind());
|
|
}
|
|
|
|
void Twine::printRepr(raw_ostream &OS) const {
|
|
OS << "(Twine ";
|
|
printOneChildRepr(OS, LHS, getLHSKind());
|
|
OS << " ";
|
|
printOneChildRepr(OS, RHS, getRHSKind());
|
|
OS << ")";
|
|
}
|
|
|
|
void Twine::dump() const {
|
|
print(llvm::dbgs());
|
|
}
|
|
|
|
void Twine::dumpRepr() const {
|
|
printRepr(llvm::dbgs());
|
|
}
|