replica
/
hanchenye-llvm-project
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

MS ABI: Simplify endian swapping code 

No functionality change.

llvm-svn: 205250
This commit is contained in:
David Majnemer 2014-03-31 21:46:05 +00:00
parent 39006cd3b8
commit e49c4b6ff2
1 changed files with 4 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
clang/lib/AST/MicrosoftMangle.cpp
View File

@ -2388,31 +2388,15 @@ void MicrosoftMangleContextImpl::mangleStringLiteral(const StringLiteral *SL,
auto GetLittleEndianByte = [&Mangler, &SL](unsigned Index) {
unsigned CharByteWidth = SL->getCharByteWidth();
uint32_t CodeUnit = SL->getCodeUnit(Index / CharByteWidth);
if (CharByteWidth == 1) {
return static_cast<char>(CodeUnit);
} else if (CharByteWidth == 2) {
if (Index % 2)
return static_cast<char>((CodeUnit >> 8) & 0xff);
else
return static_cast<char>(CodeUnit & 0xff);
} else {
llvm_unreachable("unsupported CharByteWidth");
}
unsigned OffsetInCodeUnit = Index % CharByteWidth;
return static_cast<char>((CodeUnit >> (8 * OffsetInCodeUnit)) & 0xff);
};
auto GetBigEndianByte = [&Mangler, &SL](unsigned Index) {
unsigned CharByteWidth = SL->getCharByteWidth();
uint32_t CodeUnit = SL->getCodeUnit(Index / CharByteWidth);
if (CharByteWidth == 1) {
return static_cast<char>(CodeUnit);
} else if (CharByteWidth == 2) {
if (Index % 2)
return static_cast<char>(CodeUnit & 0xff);
else
return static_cast<char>((CodeUnit >> 8) & 0xff);
} else {
llvm_unreachable("unsupported CharByteWidth");
}
unsigned OffsetInCodeUnit = (CharByteWidth - 1) - (Index % CharByteWidth);
return static_cast<char>((CodeUnit >> (8 * OffsetInCodeUnit)) & 0xff);
};
// CRC all the bytes of the StringLiteral.