https://llvm.org/bugs/show_bug.cgi?id=31346
Bug ID: 31346
Summary: Investigate whether or not we need a frame pointer
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
In the past, we removed the frame pointer (R29R28). The code made the
assumption that the register would always contain the frame pointer.
If you look at the AVR-GCC wiki, it will always set up a frame pointer
https://gcc.gnu.org/wiki/avr-gcc
> In order to access stack locations, avr-gcc will set up a 16-bit frame
> pointer in R29:R28 (Y) because the stack pointer (SP) cannot be used to
> access stack slots.
We may need to add this back in in order to be compatible with the AVR-GCC
calling convention.
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