https://llvm.org/bugs/show_bug.cgi?id=28624
Bug ID: 28624
Summary: lib/Target/AArch64/AArch64InstrInfo.cpp:3556:
suspicious shift ?
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: dcb...@hotmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
trunk/llvm/lib/Target/AArch64/AArch64InstrInfo.cpp:3556]: (error) Shifting
32-bit value by 32 bits is undefined behaviour
Source code is
uint64_t UImm = -Imm << (64 - BitSize) >> (64 - BitSize);
Maybe better code
uint64_t UImm = ((uint64_t) -Imm) << (64 - BitSize) >> (64 - BitSize);
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