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