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comparisonvalue
2010 Feb 27
3
[LLVMdev] Object layout bug for C++ derived class with long long integer
...: Foo { long long fourth; }
I generate JIT code to access 'fourth' from a Foo * as follows:
BarPtr = CreateBitCast(FooPtr, BarPtrTy);
FourthPtr = CreateConstGEP2_32(BarPtr, 0, 3);
FourthValue = CreateLoad(FourthPtr);
ConstantValue = ConstantInt::get(FourthValue->getType(), 0x2A4);
ComparisonValue = CreateICmpEQ(FourthValue, ConstantValue);
This appears to work on Linux and MacOSX with LLVM 2.6 and LLVM 2.7. On Windows, however, where I only have LLVM 2.6 with MINGW/MSYS, the generated code looks like this:
0x13df70b3: mov $0x2a4,%ecx
0x13df70b8: xor 0xc(%edi),%ecx
0x13df70bb: or...