bolt/test/runtime/X86/user-func-reorder.c

   1 /* Checks that BOLT correctly processes a user-provided function list file,
   2  * reorder functions according to this list, update hot_start and hot_end
   3  * symbols and insert a function to perform hot text mapping during program
   4  * startup.
   5  */
   6 #include <stdio.h>
   7
   8 int foo(int x) {
   9   return x + 1;
  10 }
  11
  12 int fib(int x) {
  13   if (x < 2)
  14     return x;
  15   return fib(x - 1) + fib(x - 2);
  16 }
  17
  18 int bar(int x) {
  19   return x - 1;
  20 }
  21
  22 int main(int argc, char **argv) {
  23   printf("fib(%d) = %d\n", argc, fib(argc));
  24   return 0;
  25 }
  26
  27 /*
  28 REQUIRES: system-linux,bolt-runtime
  29
  30 RUN: %clang %cflags -no-pie %s -o %t.exe -Wl,-q
  31
  32 RUN: llvm-bolt %t.exe --relocs=1 --lite --reorder-functions=user \
  33 RUN:   --hugify --function-order=%p/Inputs/user_func_order.txt -o %t
  34 RUN: llvm-nm --numeric-sort --print-armap %t | \
  35 RUN:   FileCheck %s -check-prefix=CHECK-NM
  36 RUN: %t 1 2 3 | FileCheck %s -check-prefix=CHECK-OUTPUT
  37
  38 CHECK-NM:      W  __hot_start
  39 CHECK-NM:      T main
  40 CHECK-NM-NEXT: T fib
  41 CHECK-NM-NEXT: W __hot_end
  42
  43 CHECK-OUTPUT: fib(4) = 3
  44 */