clang/test/CodeGen/builtins.cpp

   1 // RUN: %clang_cc1 -std=c++11 -triple x86_64-linux-gnu -ffreestanding -verify %s
   2 // RUN: %clang_cc1 -std=c++11 -triple i686-pc-linux-gnu -ffreestanding -verify %s
   3
   4 // expected-no-diagnostics
   5
   6 // Test that checks that the builtins return the same type as the stdint.h type
   7 // withe the same witdh. This is done by first declaring a variable of a stdint
   8 // type of the correct width and the redeclaring the variable with the type that
   9 // the builting return. If the types are different you should the an error from
  10 // clang of the form:
  11 // "redefinition of '<varname>' with a different type: '<type1>' vs '<type2>'
  12 // (with gcc you get an error message
  13 // "conflicting declaration '<type> <varname>'").
  14
  15 #include <stdint.h>
  16
  17 extern uint16_t bswap16;
  18 decltype(__builtin_bswap16(0)) bswap16 = 42;
  19 extern uint32_t bswap32;
  20 decltype(__builtin_bswap32(0)) bswap32 = 42;
  21 extern uint64_t bswap64;
  22 decltype(__builtin_bswap64(0)) bswap64 = 42;
  23
  24 #ifdef __clang__
  25 extern uint8_t bitrev8;
  26 decltype(__builtin_bitreverse8(0)) bitrev8 = 42;
  27 extern uint16_t bitrev16;
  28 decltype(__builtin_bitreverse16(0)) bitrev16 = 42;
  29 extern uint32_t bitrev32;
  30 decltype(__builtin_bitreverse32(0)) bitrev32 = 42;
  31 extern uint64_t bitrev64;
  32 decltype(__builtin_bitreverse64(0)) bitrev64 = 42;
  33
  34 extern uint8_t rotl8;
  35 decltype(__builtin_rotateleft8(0,0)) rotl8 = 42;
  36 extern uint16_t rotl16;
  37 decltype(__builtin_rotateleft16(0,0)) rotl16 = 42;
  38 extern uint32_t rotl32;
  39 decltype(__builtin_rotateleft32(0,0)) rotl32 = 42;
  40 extern uint64_t rotl64;
  41 decltype(__builtin_rotateleft64(0,0)) rotl64 = 42;
  42
  43 extern uint8_t rotr8;
  44 decltype(__builtin_rotateright8(0,0)) rotr8 = 42;
  45 extern uint16_t rotr16;
  46 decltype(__builtin_rotateright16(0,0)) rotr16 = 42;
  47 extern uint32_t rotr32;
  48 decltype(__builtin_rotateright32(0,0)) rotr32 = 42;
  49 extern uint64_t rotr64;
  50 decltype(__builtin_rotateright64(0,0)) rotr64 = 42;
  51 #endif