[Sema][SVE] Add tests for valid and invalid type usage

[rsandifo-arm]

Summary

This patch adds C and C++ tests for various uses of SVE types.
The tests cover valid uses that are already (correctly) accepted and
invalid uses that are already (correctly) rejected. Later patches
will expand the tests as they fix other cases.[*]

Some of the tests for invalid uses aren't obviously related to
scalable vectors. Part of the reason for having them is to make
sure that the quality of the error message doesn't regress once/if
the types are treated as incomplete types.

• These later patches all fix invalid uses that are being incorrectly accepted. I don't know of any cases in which valid uses are being incorrectly rejected. In other words, this series is all about diagnosing invalid code rather than enabling something new.

[rsandifo-arm]

Changes in v2:

• Reformat the tests using git-clang-format

[efriedma]

clang/test/SemaCXX/sizeless-1.cpp

8

This is a lot of RUN lines (both here and in the other file). Are you really getting any significant benefit from them?

[rsandifo-arm]

Changes in v3:

• Prune the number of RUN: lines.

• Minor tweaks to the tests themselves.

[rsandifo-arm]

clang/test/SemaCXX/sizeless-1.cpp

8

Yeah, I probably went a bit overboard there. The idea originally was to make sure that sizeless types worked with every standard, but of course that list is going to get out of date fast. (E.g. it predated C++20.)

I've now restricted it to:

• the earliest standard
• standards that are tested explicitly in preprocessor conditions
• one gnu standard per test

[efriedma]

LGTM

clang/test/Sema/sizeless-1.c

+// RUN: %clang_cc1 -fsyntax-only -verify -Wall -W -Wno-comment -triple arm64-linux-gnu -target-feature +sve -std=c90 %s
+// RUN: %clang_cc1 -fsyntax-only -verify -Wall -W -triple arm64-linux-gnu -target-feature +sve -std=gnu90 %s
+// RUN: %clang_cc1 -fsyntax-only -verify -Wall -W -triple arm64-linux-gnu -target-feature +sve -std=c99 %s
+// RUN: %clang_cc1 -fsyntax-only -verify -Wall -W -triple arm64-linux-gnu -target-feature +sve -std=gnu99 %s
+// RUN: %clang_cc1 -fsyntax-only -verify -Wall -W -triple arm64-linux-gnu -target-feature +sve -std=c11 %s
+// RUN: %clang_cc1 -fsyntax-only -verify -Wall -W -triple arm64-linux-gnu -target-feature +sve -std=gnu11 %s
+
+typedef __SVInt8_t svint8_t;
+typedef __SVInt16_t svint16_t;
+
+svint8_t *global_int8_ptr;
+extern svint8_t *extern_int8_ptr;
+static svint8_t *static_int8_ptr;
+
+typedef svint8_t int8_typedef;
+typedef svint8_t *int8_ptr_typedef;
+
+void pass_int8(svint8_t); // expected-note {{passing argument to parameter here}}
+
+svint8_t return_int8();
+
+typedef svint8_t vec_int8_a __attribute__((vector_size(64)));    // expected-error {{invalid vector element type}}
+typedef svint8_t vec_int8_b __attribute__((ext_vector_type(4))); // expected-error {{invalid vector element type}}
+
+void dump(const volatile void *);
+
+void __attribute__((overloadable)) overf(svint8_t);
+void __attribute__((overloadable)) overf(svint16_t);
+
+void __attribute__((overloadable)) overf8(svint8_t); // expected-note + {{not viable}}
+void __attribute__((overloadable)) overf8(int);      // expected-note + {{not viable}}
+
+void __attribute__((overloadable)) overf16(svint16_t); // expected-note + {{not viable}}
+void __attribute__((overloadable)) overf16(int);       // expected-note + {{not viable}}
+
+void noproto();
+void varargs(int, ...);
+
+void unused() {
+  svint8_t unused_int8; // expected-warning {{unused}}
+}
+
+struct incomplete_struct *incomplete_ptr;
+
+void func(int sel) {
+  svint8_t local_int8;
+  svint16_t local_int16;
+
+  // Using pointers to sizeless data isn't wrong here, but because the
+  // type is incomplete, it doesn't provide any alignment guarantees.
+  _Static_assert(__atomic_is_lock_free(1, &local_int8) == __atomic_is_lock_free(1, incomplete_ptr), "");
+  _Static_assert(__atomic_is_lock_free(2, &local_int8) == __atomic_is_lock_free(2, incomplete_ptr), ""); // expected-error {{static_assert expression is not an integral constant expression}}
+  _Static_assert(__atomic_always_lock_free(1, &local_int8) == __atomic_always_lock_free(1, incomplete_ptr), "");
+
+  local_int8; // expected-warning {{expression result unused}}
+
+  (void)local_int8;
+
+  local_int8, 0; // expected-warning + {{expression result unused}}
+
+  0, local_int8; // expected-warning + {{expression result unused}}
+
+  svint8_t init_int8 = local_int8;
+  svint8_t bad_init_int8 = for; // expected-error {{expected expression}}
+
+  int empty_brace_init_int = {}; // expected-error {{scalar initializer cannot be empty}}
+
+  const svint8_t const_int8 = local_int8; // expected-note {{declared const here}}
+  const svint8_t uninit_const_int8;
+
+  volatile svint8_t volatile_int8;
+
+  const volatile svint8_t const_volatile_int8 = local_int8; // expected-note {{declared const here}}
+  const volatile svint8_t uninit_const_volatile_int8;
+
+  __restrict svint8_t restrict_int8; // expected-error {{requires a pointer or reference}}
+
+  _Bool test_int8 = init_int8; // expected-error {{initializing '_Bool' with an expression of incompatible type 'svint8_t'}}
+
+  int int_int8 = init_int8; // expected-error {{initializing 'int' with an expression of incompatible type 'svint8_t'}}
+
+  init_int8 = local_int8;
+  init_int8 = local_int16; // expected-error {{assigning to 'svint8_t' (aka '__SVInt8_t') from incompatible type 'svint16_t'}}
+  init_int8 = sel;         // expected-error {{assigning to 'svint8_t' (aka '__SVInt8_t') from incompatible type 'int'}}
+
+  sel = local_int8; // expected-error {{assigning to 'int' from incompatible type 'svint8_t'}}
+
+  local_int8 = (svint8_t)local_int8;       // expected-error {{arithmetic or pointer type is required}}
+  local_int8 = (const svint8_t)local_int8; // expected-error {{arithmetic or pointer type is required}}
+  local_int8 = (svint8_t)local_int8;       // expected-error {{arithmetic or pointer type is required}}
+
+  init_int8 = local_int8;
+  init_int8 = const_int8;
+  init_int8 = volatile_int8;
+  init_int8 = const_volatile_int8;
+
+  const_int8 = local_int8; // expected-error {{cannot assign to variable 'const_int8' with const-qualified type 'const svint8_t'}}
+
+  volatile_int8 = local_int8;
+  volatile_int8 = const_int8;
+  volatile_int8 = volatile_int8;
+  volatile_int8 = const_volatile_int8;
+
+  const_volatile_int8 = local_int8; // expected-error {{cannot assign to variable 'const_volatile_int8' with const-qualified type 'const volatile svint8_t'}}
+
+  pass_int8(local_int8);
+  pass_int8(local_int16); // expected-error {{passing 'svint16_t' (aka '__SVInt16_t') to parameter of incompatible type 'svint8_t'}}
+
+  local_int8 = return_int8();
+  local_int16 = return_int8(); // expected-error {{assigning to 'svint16_t' (aka '__SVInt16_t') from incompatible type 'svint8_t'}}
+
+  dump(&local_int8);
+  dump(&const_int8);
+  dump(&volatile_int8);
+  dump(&const_volatile_int8);
+
+  *&local_int8 = local_int8;
+  *&const_int8 = local_int8; // expected-error {{read-only variable is not assignable}}
+  *&volatile_int8 = local_int8;
+  *&const_volatile_int8 = local_int8; // expected-error {{read-only variable is not assignable}}
+
+  overf(local_int8);
+  overf(local_int16);
+
+  overf8(local_int8);
+  overf8(local_int16); // expected-error {{no matching function}}
+
+  overf16(local_int8); // expected-error {{no matching function}}
+  overf16(local_int16);
+
+  noproto(local_int8);
+  varargs(1, local_int8, local_int16);
+
+  +init_int8;       // expected-error {{invalid argument type 'svint8_t'}}
+  ++init_int8;      // expected-error {{cannot increment value of type 'svint8_t'}}
+  init_int8++;      // expected-error {{cannot increment value of type 'svint8_t'}}
+  -init_int8;       // expected-error {{invalid argument type 'svint8_t'}}
+  --init_int8;      // expected-error {{cannot decrement value of type 'svint8_t'}}
+  init_int8--;      // expected-error {{cannot decrement value of type 'svint8_t'}}
+  ~init_int8;       // expected-error {{invalid argument type 'svint8_t'}}
+  !init_int8;       // expected-error {{invalid argument type 'svint8_t'}}
+  *init_int8;       // expected-error {{indirection requires pointer operand}}
+  __real init_int8; // expected-error {{invalid type 'svint8_t'}}
+  __imag init_int8; // expected-error {{invalid type 'svint8_t'}}
+
+  local_int8 + init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 - init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 *init_int8;   // expected-error {{invalid operands to binary expression}}
+  local_int8 / init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 % init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 &init_int8;   // expected-error {{invalid operands to binary expression}}
+  local_int8 | init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 ^ init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 << init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 >> init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 < init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 <= init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 == init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 != init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 >= init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 > init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 &&init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 || init_int8; // expected-error {{invalid operands to binary expression}}
+
+  local_int8 += init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 -= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 *= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 /= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 %= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 &= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 |= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 ^= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 <<= init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 >>= init_int8; // expected-error {{invalid operands to binary expression}}
+
+  local_int8 + 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 - 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 * 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 / 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 % 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 & 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 | 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 ^ 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 << 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 >> 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 < 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 <= 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 == 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 != 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 >= 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 > 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 && 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 || 0; // expected-error {{invalid operands to binary expression}}
+
+  if (local_int8) { // expected-error {{statement requires expression of scalar type}}
+  }
+  while (local_int8) { // expected-error {{statement requires expression of scalar type}}
+  }
+  do { // expected-error {{statement requires expression of scalar type}}
+  } while (local_int8);
+  switch (local_int8) { // expected-error {{statement requires expression of integer type}}
+  default:;
+  }
+}
+
+int vararg_receiver(int count, svint8_t first, ...) {
+  __builtin_va_list va;
+
+  __builtin_va_start(va, first);
+  __builtin_va_arg(va, svint8_t);
+  __builtin_va_end(va);
+  return count;
+}
+
+#if __STDC_VERSION__ >= 201112L
+void test_generic(void) {
+  svint8_t local_int8;
+  svint16_t local_int16;
+
+  int a1[_Generic(local_int8, svint8_t : 1, svint16_t : 2, default : 3) == 1 ? 1 : -1];
+  int a2[_Generic(local_int16, svint8_t : 1, svint16_t : 2, default : 3) == 2 ? 1 : -1];
+  int a3[_Generic(0, svint8_t : 1, svint16_t : 2, default : 3) == 3 ? 1 : -1];
+  (void)_Generic(0, svint8_t : 1, svint8_t : 2, default : 3); // expected-error {{type 'svint8_t' (aka '__SVInt8_t') in generic association compatible with previously specified type 'svint8_t'}} expected-note {{compatible type}}
+}
+#endif

clang/test/SemaCXX/sizeless-1.cpp

+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=c++98 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=gnu++98 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=c++11 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=gnu++11 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=c++14 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=gnu++14 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=c++17 %s
+// RUN: %clang_cc1 -fcxx-exceptions -fsyntax-only -verify -W -Wall -Wrange-loop-analysis -triple arm64-linux-gnu -target-feature +sve -std=gnu++17 %s
+
+namespace std {
+struct type_info;
+}
+
+typedef __SVInt8_t svint8_t;
+typedef __SVInt16_t svint16_t;
+
+svint8_t *global_int8_ptr;
+extern svint8_t *extern_int8_ptr;
+static svint8_t *static_int8_ptr;
+
+typedef svint8_t int8_typedef;
+typedef svint8_t *int8_ptr_typedef;
+
+void pass_int8(svint8_t); // expected-note {{no known conversion}}
+
+svint8_t return_int8();
+
+typedef svint8_t vec_int8_a __attribute__((vector_size(64)));    // expected-error {{invalid vector element type}}
+typedef svint8_t vec_int8_b __attribute__((ext_vector_type(4))); // expected-error {{invalid vector element type}}
+
+void dump(const volatile void *);
+
+void overf(svint8_t);
+void overf(svint16_t);
+
+void overf8(svint8_t); // expected-note + {{not viable}}
+void overf8(int);      // expected-note + {{not viable}}
+
+void overf16(svint16_t); // expected-note + {{not viable}}
+void overf16(int);       // expected-note + {{not viable}}
+
+void varargs(int, ...);
+
+void unused() {
+  svint8_t unused_int8; // expected-warning {{unused}}
+}
+
+struct incomplete_struct *incomplete_ptr;
+
+void func(int sel) {
+  svint8_t local_int8;
+  svint16_t local_int16;
+
+  // Using pointers to sizeless data isn't wrong here, but because the
+  // type is incomplete, it doesn't provide any alignment guarantees.
+  _Static_assert(__atomic_is_lock_free(1, &local_int8) == __atomic_is_lock_free(1, incomplete_ptr), "");
+  _Static_assert(__atomic_is_lock_free(2, &local_int8) == __atomic_is_lock_free(2, incomplete_ptr), ""); // expected-error {{static_assert expression is not an integral constant expression}}
+  _Static_assert(__atomic_always_lock_free(1, &local_int8) == __atomic_always_lock_free(1, incomplete_ptr), "");
+
+  local_int8; // expected-warning {{expression result unused}}
+
+  (void)local_int8;
+
+  local_int8, 0; // expected-warning + {{expression result unused}}
+
+  0, local_int8; // expected-warning + {{expression result unused}}
+
+  svint8_t init_int8 = local_int8;
+  svint8_t bad_init_int8 = for; // expected-error {{expected expression}}
+
+#if __cplusplus >= 201103L
+  int empty_brace_init_int = {};
+#else
+  int empty_brace_init_int = {}; // expected-error {{scalar initializer cannot be empty}}
+#endif
+
+  const svint8_t const_int8 = local_int8; // expected-note {{declared const here}}
+  const svint8_t uninit_const_int8;       // expected-error {{default initialization of an object of const type 'const svint8_t'}}
+
+  volatile svint8_t volatile_int8;
+
+  const volatile svint8_t const_volatile_int8 = local_int8; // expected-note {{declared const here}}
+  const volatile svint8_t uninit_const_volatile_int8;       // expected-error {{default initialization of an object of const type 'const volatile svint8_t'}}
+
+  __restrict svint8_t restrict_int8; // expected-error {{requires a pointer or reference}}
+
+  bool test_int8 = init_int8; // expected-error {{cannot initialize a variable of type 'bool' with an lvalue of type 'svint8_t'}}
+
+  int int_int8 = init_int8; // expected-error {{cannot initialize a variable of type 'int' with an lvalue of type 'svint8_t'}}
+
+  init_int8 = local_int8;
+  init_int8 = local_int16; // expected-error {{assigning to 'svint8_t' (aka '__SVInt8_t') from incompatible type 'svint16_t'}}
+  init_int8 = sel;         // expected-error {{assigning to 'svint8_t' (aka '__SVInt8_t') from incompatible type 'int'}}
+
+  sel = local_int8; // expected-error {{assigning to 'int' from incompatible type 'svint8_t'}}
+
+  local_int8 = (svint8_t)local_int8;
+  local_int8 = (const svint8_t)local_int8;
+  local_int8 = (svint8_t)local_int16; // expected-error {{C-style cast from 'svint16_t' (aka '__SVInt16_t') to 'svint8_t' (aka '__SVInt8_t') is not allowed}}
+
+  init_int8 = local_int8;
+  init_int8 = const_int8;
+  init_int8 = volatile_int8;
+  init_int8 = const_volatile_int8;
+
+  const_int8 = local_int8; // expected-error {{cannot assign to variable 'const_int8' with const-qualified type 'const svint8_t'}}
+
+  volatile_int8 = local_int8;
+  volatile_int8 = const_int8;
+  volatile_int8 = volatile_int8;
+  volatile_int8 = const_volatile_int8;
+
+  const_volatile_int8 = local_int8; // expected-error {{cannot assign to variable 'const_volatile_int8' with const-qualified type 'const volatile svint8_t'}}
+
+  init_int8 = sel ? init_int8 : local_int8;
+  init_int8 = sel ? init_int8 : const_int8;
+  init_int8 = sel ? volatile_int8 : const_int8;
+  init_int8 = sel ? volatile_int8 : const_volatile_int8;
+
+  pass_int8(local_int8);
+  pass_int8(local_int16); // expected-error {{no matching function}}
+
+  local_int8 = return_int8();
+  local_int16 = return_int8(); // expected-error {{assigning to 'svint16_t' (aka '__SVInt16_t') from incompatible type 'svint8_t'}}
+
+  dump(&local_int8);
+  dump(&const_int8);
+  dump(&volatile_int8);
+  dump(&const_volatile_int8);
+
+  *&local_int8 = local_int8;
+  *&const_int8 = local_int8; // expected-error {{read-only variable is not assignable}}
+  *&volatile_int8 = local_int8;
+  *&const_volatile_int8 = local_int8; // expected-error {{read-only variable is not assignable}}
+
+  overf(local_int8);
+  overf(local_int16);
+
+  overf8(local_int8);
+  overf8(local_int16); // expected-error {{no matching function}}
+
+  overf16(local_int8); // expected-error {{no matching function}}
+  overf16(local_int16);
+
+  varargs(1, local_int8, local_int16);
+
+  +init_int8;       // expected-error {{invalid argument type 'svint8_t'}}
+  ++init_int8;      // expected-error {{cannot increment value of type 'svint8_t'}}
+  init_int8++;      // expected-error {{cannot increment value of type 'svint8_t'}}
+  -init_int8;       // expected-error {{invalid argument type 'svint8_t'}}
+  --init_int8;      // expected-error {{cannot decrement value of type 'svint8_t'}}
+  init_int8--;      // expected-error {{cannot decrement value of type 'svint8_t'}}
+  ~init_int8;       // expected-error {{invalid argument type 'svint8_t'}}
+  !init_int8;       // expected-error {{invalid argument type 'svint8_t'}}
+  *init_int8;       // expected-error {{indirection requires pointer operand}}
+  __real init_int8; // expected-error {{invalid type 'svint8_t'}}
+  __imag init_int8; // expected-error {{invalid type 'svint8_t'}}
+
+  local_int8 + init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 - init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 *init_int8;   // expected-error {{invalid operands to binary expression}}
+  local_int8 / init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 % init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 &init_int8;   // expected-error {{invalid operands to binary expression}}
+  local_int8 | init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 ^ init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 << init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 >> init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 < init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 <= init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 == init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 != init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 >= init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 > init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 &&init_int8;  // expected-error {{invalid operands to binary expression}} expected-error {{not contextually convertible}}
+  local_int8 || init_int8; // expected-error {{invalid operands to binary expression}} expected-error {{not contextually convertible}}
+
+  local_int8 += init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 -= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 *= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 /= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 %= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 &= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 |= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 ^= init_int8;  // expected-error {{invalid operands to binary expression}}
+  local_int8 <<= init_int8; // expected-error {{invalid operands to binary expression}}
+  local_int8 >>= init_int8; // expected-error {{invalid operands to binary expression}}
+
+  local_int8 + 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 - 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 * 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 / 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 % 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 & 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 | 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 ^ 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 << 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 >> 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 < 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 <= 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 == 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 != 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 >= 0; // expected-error {{invalid operands to binary expression}}
+  local_int8 > 0;  // expected-error {{invalid operands to binary expression}}
+  local_int8 && 0; // expected-error {{invalid operands to binary expression}} expected-error {{not contextually convertible}}
+  local_int8 || 0; // expected-error {{invalid operands to binary expression}} expected-error {{not contextually convertible}}
+
+  if (local_int8) { // expected-error {{not contextually convertible to 'bool'}}
+  }
+  while (local_int8) { // expected-error {{not contextually convertible to 'bool'}}
+  }
+  do {
+  } while (local_int8); // expected-error {{not contextually convertible to 'bool'}}
+  switch (local_int8) { // expected-error {{statement requires expression of integer type}}
+  default:;
+  }
+}
+
+int vararg_receiver(int count, svint8_t first, ...) {
+  __builtin_va_list va;
+
+  __builtin_va_start(va, first);
+  __builtin_va_end(va);
+  return count;
+}
+
+void pass_int8_ref(svint8_t &); // expected-note {{not viable}}
+
+svint8_t &return_int8_ref();
+#if __cplusplus >= 201103L
+svint8_t &&return_int8_rvalue_ref();
+#endif
+
+template <typename T>
+struct s_ptr_template {
+  s_ptr_template();
+  s_ptr_template(T, svint8_t = svint8_t());
+  s_ptr_template(const s_ptr_template &, svint8_t = svint8_t());
+  T *y;
+};
+
+struct widget {
+  widget(s_ptr_template<int>);
+  svint8_t operator[](int);
+};
+
+template <typename T>
+struct wrapper_iterator {
+  T operator++();
+  T operator*() const;
+  bool operator!=(const wrapper_iterator &) const;
+};
+
+template <typename T>
+struct wrapper {
+  wrapper();
+  operator T() const;
+  wrapper_iterator<T> begin() const;
+  wrapper_iterator<T> end() const;
+};
+
+#if __cplusplus >= 201103L
+struct explicit_conv {
+  explicit operator svint8_t() const; // expected-note {{explicit conversion function is not a candidate}}
+};
+#endif
+
+struct constructible_from_sizeless {
+  constructible_from_sizeless(svint8_t);
+};
+
+void with_default(svint8_t = svint8_t());
+
+#if __cplusplus >= 201103L
+constexpr int ce_taking_int8(svint8_t) { return 1; } // expected-error {{constexpr function's 1st parameter type 'svint8_t' (aka '__SVInt8_t') is not a literal type}}
+#endif
+
+template <typename T>
+void template_fn_direct(T) {}
+template <typename T>
+void template_fn_ref(T &) {}
+template <typename T>
+void template_fn_const_ref(const T &) {}
+#if __cplusplus >= 201103L
+template <typename T>
+void template_fn_rvalue_ref(T &&) {}
+#endif
+
+void cxx_only() {
+  svint8_t local_int8;
+  svint16_t local_int16;
+
+  pass_int8_ref(local_int8);
+  pass_int8_ref(local_int16); // expected-error {{no matching function}}
+
+  local_int8 = return_int8_ref();
+  local_int16 = return_int8_ref(); // expected-error {{assigning to 'svint16_t' (aka '__SVInt16_t') from incompatible type 'svint8_t'}}
+  return_int8_ref() = local_int8;
+  return_int8_ref() = local_int16; // expected-error {{assigning to 'svint8_t' (aka '__SVInt8_t') from incompatible type 'svint16_t'}}
+
+#if __cplusplus >= 201103L
+  local_int8 = return_int8_rvalue_ref();
+  local_int16 = return_int8_rvalue_ref(); // expected-error {{assigning to 'svint16_t' (aka '__SVInt16_t') from incompatible type 'svint8_t'}}
+
+  return_int8_rvalue_ref() = local_int8;  // expected-error {{expression is not assignable}}
+  return_int8_rvalue_ref() = local_int16; // expected-error {{expression is not assignable}}
+#endif
+
+  local_int8 = static_cast<svint8_t>(local_int8);
+  local_int8 = static_cast<svint8_t>(local_int16);  // expected-error {{static_cast from 'svint16_t' (aka '__SVInt16_t') to 'svint8_t' (aka '__SVInt8_t') is not allowed}}
+  local_int16 = static_cast<svint16_t>(local_int8); // expected-error {{static_cast from 'svint8_t' (aka '__SVInt8_t') to 'svint16_t' (aka '__SVInt16_t') is not allowed}}
+
+  local_int8.~__SVInt8_t(); // expected-error {{object expression of non-scalar type 'svint8_t' (aka '__SVInt8_t') cannot be used in a pseudo-destructor expression}}
+
+  (void)svint8_t();
+
+  local_int8 = svint8_t();
+  local_int8 = svint16_t(); // expected-error {{assigning to 'svint8_t' (aka '__SVInt8_t') from incompatible type 'svint16_t'}}
+
+  s_ptr_template<int> st_ptr_int;
+  s_ptr_template<svint8_t> st_ptr_svint8;
+
+  widget w(1);
+  local_int8 = w[1];
+
+  local_int8 = static_cast<svint8_t>(wrapper<svint8_t>());
+  local_int16 = static_cast<svint8_t>(wrapper<svint8_t>()); // expected-error {{assigning to 'svint16_t' (aka '__SVInt16_t') from incompatible type 'svint8_t'}}
+
+  local_int8 = wrapper<svint8_t>();
+  local_int16 = wrapper<svint8_t>(); // expected-error {{assigning to 'svint16_t' (aka '__SVInt16_t') from incompatible type 'wrapper<svint8_t>'}}
+
+  svint8_t &ref_int8 = local_int8;
+  ref_int8 = ref_int8; // expected-warning {{explicitly assigning value of variable of type 'svint8_t' (aka '__SVInt8_t') to itself}}
+  ref_int8 = local_int8;
+  local_int8 = ref_int8;
+
+#if __cplusplus >= 201103L
+  svint8_t wrapper_init_int8{wrapper<svint8_t>()};
+  svint8_t &ref_init_int8{local_int8};
+
+  template_fn_direct<svint8_t>({wrapper<svint8_t>()});
+#endif
+
+  template_fn_direct(local_int8);
+  template_fn_ref(local_int8);
+  template_fn_const_ref(local_int8);
+#if __cplusplus >= 201103L
+  template_fn_rvalue_ref(local_int8);
+#endif
+
+#if __cplusplus >= 201103L
+  constexpr svint8_t ce_int8_a = wrapper<svint8_t>(); // expected-error {{constexpr variable cannot have non-literal type 'const svint8_t'}}
+#endif
+
+  (void)typeid(__SVInt8_t);
+  (void)typeid(__SVInt8_t *);
+  (void)typeid(local_int8);
+  (void)typeid(ref_int8);
+  (void)typeid(static_int8_ptr);
+
+  _Static_assert(__is_trivially_destructible(svint8_t), "");
+  _Static_assert(!__is_nothrow_assignable(svint8_t, svint8_t), "");
+  _Static_assert(__is_nothrow_assignable(svint8_t &, svint8_t), "");
+  _Static_assert(!__is_nothrow_assignable(svint8_t &, svint16_t), "");
+  _Static_assert(__is_constructible(svint8_t), "");
+  _Static_assert(__is_constructible(svint8_t, svint8_t), "");
+  _Static_assert(!__is_constructible(svint8_t, svint8_t, svint8_t), "");
+  _Static_assert(!__is_constructible(svint8_t, svint16_t), "");
+  _Static_assert(__is_nothrow_constructible(svint8_t), "");
+  _Static_assert(__is_nothrow_constructible(svint8_t, svint8_t), "");
+  _Static_assert(!__is_nothrow_constructible(svint8_t, svint16_t), "");
+  _Static_assert(!__is_assignable(svint8_t, svint8_t), "");
+  _Static_assert(__is_assignable(svint8_t &, svint8_t), "");
+  _Static_assert(!__is_assignable(svint8_t &, svint16_t), "");
+  _Static_assert(!__has_virtual_destructor(svint8_t), "");
+  _Static_assert(!__is_abstract(svint8_t), "");
+  _Static_assert(!__is_aggregate(svint8_t), "");
+  _Static_assert(!__is_base_of(svint8_t, svint8_t), "");
+  _Static_assert(!__is_class(svint8_t), "");
+  _Static_assert(__is_convertible_to(svint8_t, svint8_t), "");
+  _Static_assert(!__is_convertible_to(svint8_t, svint16_t), "");
+  _Static_assert(!__is_empty(svint8_t), "");
+  _Static_assert(!__is_enum(svint8_t), "");
+  _Static_assert(!__is_final(svint8_t), "");
+  _Static_assert(!__is_literal(svint8_t), "");
+  _Static_assert(!__is_polymorphic(svint8_t), "");
+  _Static_assert(__is_object(svint8_t), "");
+  _Static_assert(!__is_arithmetic(svint8_t), "");
+  _Static_assert(!__is_floating_point(svint8_t), "");
+  _Static_assert(!__is_integral(svint8_t), "");
+  _Static_assert(!__is_void(svint8_t), "");
+  _Static_assert(!__is_array(svint8_t), "");
+  _Static_assert(!__is_function(svint8_t), "");
+  _Static_assert(!__is_reference(svint8_t), "");
+  _Static_assert(__is_reference(svint8_t &), "");
+  _Static_assert(__is_reference(const svint8_t &), "");
+  _Static_assert(!__is_lvalue_reference(svint8_t), "");
+  _Static_assert(__is_lvalue_reference(svint8_t &), "");
+#if __cplusplus >= 201103L
+  _Static_assert(!__is_lvalue_reference(svint8_t &&), "");
+#endif
+  _Static_assert(!__is_rvalue_reference(svint8_t), "");
+  _Static_assert(!__is_rvalue_reference(svint8_t &), "");
+#if __cplusplus >= 201103L
+  _Static_assert(__is_rvalue_reference(svint8_t &&), "");
+#endif
+  _Static_assert(!__is_fundamental(svint8_t), "");
+  _Static_assert(__is_object(svint8_t), "");
+  _Static_assert(!__is_scalar(svint8_t), "");
+  _Static_assert(!__is_compound(svint8_t), "");
+  _Static_assert(!__is_pointer(svint8_t), "");
+  _Static_assert(__is_pointer(svint8_t *), "");
+  _Static_assert(!__is_member_object_pointer(svint8_t), "");
+  _Static_assert(!__is_member_function_pointer(svint8_t), "");
+  _Static_assert(!__is_member_pointer(svint8_t), "");
+  _Static_assert(!__is_const(svint8_t), "");
+  _Static_assert(__is_const(const svint8_t), "");
+  _Static_assert(__is_const(const volatile svint8_t), "");
+  _Static_assert(!__is_volatile(svint8_t), "");
+  _Static_assert(__is_volatile(volatile svint8_t), "");
+  _Static_assert(__is_volatile(const volatile svint8_t), "");
+  _Static_assert(!__is_standard_layout(svint8_t), "");
+  // At present these types are opaque and don't have the properties
+  // implied by their name.
+  _Static_assert(!__is_signed(svint8_t), "");
+  _Static_assert(!__is_unsigned(svint8_t), "");
+
+#if __cplusplus >= 201103L
+  auto auto_int8 = local_int8;
+  auto auto_int16 = local_int16;
+#if __cplusplus >= 201703L
+  auto [auto_int8_a] = local_int8; // expected-error {{cannot decompose non-class, non-array type '__SVInt8_t'}}
+#endif
+#endif
+
+  s_ptr_template<int> y;
+  s_ptr_template<int> &x = y;
+
+  constructible_from_sizeless cfs1(local_int8);
+  constructible_from_sizeless cfs2 = local_int8;
+#if __cplusplus >= 201103L
+  constructible_from_sizeless cfs3{local_int8};
+#endif
+
+#if __cplusplus >= 201103L
+  local_int8 = ([]() { return svint8_t(); })();
+  local_int8 = ([]() -> svint8_t { return svint8_t(); })();
+  auto fn1 = [&local_int8](svint8_t x) { local_int8 = x; };
+  auto fn2 = [&local_int8](svint8_t *ptr) { *ptr = local_int8; };
+
+  for (auto x : local_int8) { // expected-error {{no viable 'begin' function available}}
+  }
+  for (auto x : wrapper<svint8_t>()) {
+    (void)x;
+  }
+  for (const svint8_t &x : wrapper<svint8_t>()) { // expected-warning {{loop variable 'x' is always a copy because the range of type 'wrapper<svint8_t>' (aka 'wrapper<__SVInt8_t>') does not return a reference}} expected-note {{use non-reference type}}
+    (void)x;
+  }
+#endif
+}
+
+#if __cplusplus >= 201103L
+svint8_t ret_bad_conv() { return explicit_conv(); } // expected-error {{no viable conversion from returned value of type 'explicit_conv' to function return type 'svint8_t'}}
+#endif