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Fix BYTE instruction

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Paweł Bylica 2015-01-16 15:54:58 +01:00
parent a2492d4983
commit f78fbbf50e
1 changed files with 2 additions and 1 deletions
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3
libevmjit/Compiler.cpp
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@ -394,7 +394,8 @@ void Compiler::compileBasicBlock(BasicBlock& _basicBlock, bytes const& _bytecode
value = Endianness::toBE(m_builder, value); value = Endianness::toBE(m_builder, value);
auto bytes = m_builder.CreateBitCast(value, llvm::VectorType::get(Type::Byte, 32), "bytes"); auto bytes = m_builder.CreateBitCast(value, llvm::VectorType::get(Type::Byte, 32), "bytes");
auto byte = m_builder.CreateExtractElement(bytes, byteNum, "byte"); auto safeByteNum = m_builder.CreateZExt(m_builder.CreateTrunc(byteNum, m_builder.getIntNTy(5)), Type::lowPrecision); // Trim index, large values can crash
auto byte = m_builder.CreateExtractElement(bytes, safeByteNum, "byte");
value = m_builder.CreateZExt(byte, Type::Word); value = m_builder.CreateZExt(byte, Type::Word);
auto byteNumValid = m_builder.CreateICmpULT(byteNum, Constant::get(32)); auto byteNumValid = m_builder.CreateICmpULT(byteNum, Constant::get(32));