libcxxabi/test/vendor/ibm/cond_reg_restore.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // Check that the condition register is restored properly during unwinding
  10 // on AIX. Option -O3 is required so that the compiler will re-use the value
  11 // in the condition register instead of re-evaluating the condition expression.
  12
  13 // REQUIRES: target=powerpc{{(64)?}}-ibm-aix
  14 // ADDITIONAL_COMPILE_FLAGS: -O3
  15 // UNSUPPORTED: no-exceptions
  16
  17 #include <cstdlib>
  18 #include <cassert>
  19
  20 int __attribute__((noinline)) test2(int i) {
  21   // The inline assembly forces the prologue/epilogue to save/restore the
  22   // condition register.
  23   asm volatile("nop" : : : "cr2");
  24   if (i > 3) {
  25     throw i;
  26   }
  27   srand(i);
  28   return rand() + i;
  29 }
  30
  31 void __attribute__((noinline)) test(int argc, const char **argv) {
  32   int a = atoi(argv[1]);
  33   int b = atoi(argv[2]);
  34   try {
  35     test2(a < b ? argc : b);
  36   } catch (int num) {
  37     assert(!(a < b));
  38   }
  39 }
  40 int main(int, char**) {
  41   const char *av[]={"a.out", "12", "10"};
  42   test(4, av);
  43   return 0;
  44 }