https://llvm.org/bugs/show_bug.cgi?id=31344
Bug ID: 31344
Summary: Optimize 16-bit ORs with '0'
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: AVR
Assignee: unassignedb...@nondot.org
Reporter: dylanmcka...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Currently if we get an OR with immediate '0xff00', we will emit two ORI
instructions, one to OR with '0xff' and one to OR with '0x00'.
ORing with 0 is unnecessary and it just causes an extra redundant operation.
Let's optimise this operation in the pseudo instruction expander.
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