llvm dev - Apr 2013 - [LLVMdev] What is the Use of "Implicit EFLAGS" in TableGen

Hi,

     In the Table Gen format of defining Instructions for X86 
architecture, some of the instruction patterns has both the dag 
expression "(implicit EFLAGS)" as well as the definition "Defs = 
[EFLAGS]". What is the difference between these two? Cant the 
Instruction Selector consider the Defs list when doing pattern match. I 
am confused when to use (implicit EFLAGS) expression.

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Thanks and Regards,
Shashidhar