[Bug target/110665] New: RISC-V do not preserve vector registers in interrupt handler

[lehua.ding at rivai dot ai via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110665

            Bug ID: 110665
           Summary: RISC-V do not preserve vector registers in interrupt
                    handler
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lehua.ding at rivai dot ai
  Target Milestone: ---

When an interrupt handler uses vector registers or calls other functions, the
handler needs to preserve the content in vector registers like GP or FP
registers. Currently, the GCC fully ignores the existence of vector registers
for this case even using -march=rv64gcv option.

Issue on Compiler Explorer: https://godbolt.org/z/nTGzr4o5P