llvm dev - Apr 2021 - how to overwrite target specific flag conditionally in Instruction in td file

Hi,
I just want to overwrite target specific flag in Instruction conditionally based
on different register class as in operand in td file.
Is there any mechanism or hook function that can do it?




Thanks,
Jerry










-------- Forwarding messages --------
From: "林政宗" <jackie_linzz at 126.com>
Date: 2021-04-15 16:52:31
To: llvm-dev at lists.llvm.org
Subject: how to overwrite an variable conditionally using let in td file

Hi,


There is an instruction definition in td file which use a super register class
as in operand. The super register class contains two register classes.
can I overwrite an variable conditionally using let statement in instruction
definition when the in operand is of one register class and not for the other
register class?
Is there any solution like conditional let in instruction definition in td file?


Thanks,
Jerry




 
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