https://bugs.llvm.org/show_bug.cgi?id=40387
Bug ID: 40387
Summary: [Optimization] Enable switch lookup tables in the AVR
backend
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AVR
Assignee: unassignedb...@nondot.org
Reporter: m...@dylanmckay.io
CC: llvm-bugs@lists.llvm.org
One example of a switch lookup table is the switch lookup table generated in
SimplifyCFG.
On AVR, a switch lookup table can only be placed into and loaded from program
memory if the MCU supports the LPM instruction. Otherwise, the table must be
loaded from RAM.
At the moment, switch lookup tables are broken on AVR.
There are two issues:
* https://github.com/avr-rust/rust/issues/47
* https://github.com/avr-rust/rust/issues/69
I have since disabled switch lookup tables on AVR to workaround these bugs.
We should get switch lookup tables working on AVR to enable more efficient
code.
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