clang/test/Sema/c2x-expr-range.c

   1 // RUN: %clang_cc1 -verify -fsyntax-only -std=c2x -triple=x86_64-unknown-linux %s
   2
   3 // Regression test for bug where we used to hit an assertion due to shift amount
   4 // being larger than 64 bits. We want to see a warning about too large shift
   5 // amount.
   6 void test1(int *a) {
   7   (void)(*a >> 123456789012345678901uwb <= 0); // expected-warning {{shift count >= width of type}}
   8 }
   9
  10 // Similar to test1 above, but using __uint128_t instead of __BitInt.
  11 // We want to see a warning about too large shift amount.
  12 void test2(__uint128_t *a) {
  13   (void)(*a >> ((__uint128_t)__UINT64_MAX__ + 1) <= 0); // expected-warning {{shift count >= width of type}}
  14 }
  15
  16 // Regression test for bug where a faulty warning was given. We don't expect to
  17 // see any warning in this case.
  18 _BitInt(128) test3(_BitInt(128) a) {
  19   return a << 12wb;
  20 }
  21
  22 // Similar to test3 above, but with a too large shift count. We expect to see a
  23 // warning in this case.
  24 _BitInt(128) test4(_BitInt(128) a) {
  25   return a << 129wb; // expected-warning {{shift count >= width of type}}
  26 }