6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-08-07 12:28:24 +00:00
Code Issues Projects Releases Wiki Activity

This transform requires valid TargetData info. Wrap it in 'if (TD)' in

Browse Source 
preparation for the day we use null TargetData when no target is specified.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71210 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2009-05-08 06:47:37 +00:00
parent 45e0010e14
commit 48f95ad971
1 changed files with 27 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@@ -11196,34 +11196,36 @@ static Instruction *InstCombineLoadCast(InstCombiner &IC, LoadInst &LI,
User *CI = cast<User>(LI.getOperand(0)); User *CI = cast<User>(LI.getOperand(0));
Value *CastOp = CI->getOperand(0); Value *CastOp = CI->getOperand(0);
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(CI)) { if (TD) {
// Instead of loading constant c string, use corresponding integer value if (ConstantExpr *CE = dyn_cast<ConstantExpr>(CI)) {
// directly if string length is small enough. // Instead of loading constant c string, use corresponding integer value
std::string Str; // directly if string length is small enough.
if (GetConstantStringInfo(CE->getOperand(0), Str) && !Str.empty()) { std::string Str;
unsigned len = Str.length(); if (GetConstantStringInfo(CE->getOperand(0), Str) && !Str.empty()) {
const Type *Ty = cast<PointerType>(CE->getType())->getElementType(); unsigned len = Str.length();
unsigned numBits = Ty->getPrimitiveSizeInBits(); const Type *Ty = cast<PointerType>(CE->getType())->getElementType();
// Replace LI with immediate integer store. unsigned numBits = Ty->getPrimitiveSizeInBits();
if ((numBits >> 3) == len + 1) { // Replace LI with immediate integer store.
APInt StrVal(numBits, 0); if ((numBits >> 3) == len + 1) {
APInt SingleChar(numBits, 0); APInt StrVal(numBits, 0);
if (TD->isLittleEndian()) { APInt SingleChar(numBits, 0);
for (signed i = len-1; i >= 0; i--) { if (TD->isLittleEndian()) {
SingleChar = (uint64_t) Str[i] & UCHAR_MAX; for (signed i = len-1; i >= 0; i--) {
SingleChar = (uint64_t) Str[i] & UCHAR_MAX;
StrVal = (StrVal << 8) | SingleChar;
}
} else {
for (unsigned i = 0; i < len; i++) {
SingleChar = (uint64_t) Str[i] & UCHAR_MAX;
StrVal = (StrVal << 8) | SingleChar;
}
// Append NULL at the end.
SingleChar = 0;
StrVal = (StrVal << 8) | SingleChar; StrVal = (StrVal << 8) | SingleChar;
} }
} else { Value *NL = ConstantInt::get(StrVal);
for (unsigned i = 0; i < len; i++) { return IC.ReplaceInstUsesWith(LI, NL);
SingleChar = (uint64_t) Str[i] & UCHAR_MAX;
StrVal = (StrVal << 8) | SingleChar;
}
// Append NULL at the end.
SingleChar = 0;
StrVal = (StrVal << 8) | SingleChar;
} }
Value *NL = ConstantInt::get(StrVal);
return IC.ReplaceInstUsesWith(LI, NL);
} }
} }
} }