simple C to LLVM

gistfile1.txt

/* C code */
int add(int x, int y)
{
        return (x+y);
}

int main()
{
        return (add (2,3) );
}

/* corresponding LLVM IR for `main` from `clang` */
define i32 @main() #0 {
entry:
  %retval = alloca i32, align 4
  store i32 0, i32* %retval
  %call = call i32 @add(i32 2, i32 3)
  ret i32 %call
}

/* corresponding LLVM IR for `main` from `clang -O` */
define i32 @main() #0 {
entry:
  ret i32 5
}