[llvm-bugs] [Bug 48982] New: [MIPS] Failure to optimize out function prologue and epilogue

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48982

            Bug ID: 48982
           Summary: [MIPS] Failure to optimize out function prologue and
                    epilogue
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: MIPS
          Assignee: unassignedbugs at nondot.org
          Reporter: gabravier at gmail.com
                CC: llvm-bugs at lists.llvm.org

void f(){}

With -O3, GCC generates this:

f():
  jrc $31

LLVM generates this:

f():
  daddiu $sp, $sp, -16
  sd $ra, 8($sp) # 8-byte Folded Spill
  sd $fp, 0($sp) # 8-byte Folded Spill
  move $fp, $sp
  move $sp, $fp
  ld $fp, 0($sp) # 8-byte Folded Reload
  ld $ra, 8($sp) # 8-byte Folded Reload
  jr $ra
  daddiu $sp, $sp, 16

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