[Bug c/119828] New: RISC-V gcc rv64gc fails to optimize away stack frame

[konstantin.vladimirov at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119828

            Bug ID: 119828
           Summary: RISC-V gcc rv64gc fails to optimize away stack frame
           Product: gcc
           Version: 14.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: konstantin.vladimirov at gmail dot com
  Target Milestone: ---

Source code:

struct S {
  int a[4];
};

int foo(struct S s) {
  return s.a[3];
}

Generated assembly:
foo:
        addi    sp,sp,-16 # useless
        srai    a0,a1,32
        addi    sp,sp,16 # useless
        jr      ra

Clang is doing well in this case.

https://godbolt.org/z/5PEP3z77K