https://llvm.org/bugs/show_bug.cgi?id=31345
Bug ID: 31345
Summary: Optimize 16-bit ANDs with '1'
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 AND with immediate '0xff00', we will emit two ANDI
instructions, one to AND with '0xff' and one to AND with '0x00'.
ANDing with 255 is unnecessary and it just causes an extra redundant operation.
Let's optimise this operation in the pseudo instruction expander.
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