PVS-Studio warning V610 for DeSmuME

enum { TAGMASK = (u32)(~0 << TAGSHIFT) };

This suspicious code was found in DeSmuME project by PVS-Studio static code analyzer.
Warning message is:
V610 Undefined behavior. Check the shift operator '<<. The left operand '~0' is negative. DeSmuME_VS2005 mmu_timing.h 158

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