Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/gcc.dg/pr56997-3.c @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
---|---|
date | Thu, 13 Feb 2020 11:34:05 +0900 |
parents | 04ced10e8804 |
children |
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/* Test volatile access to unaligned field. */ /* { dg-do run } */ /* { dg-options "-fstrict-volatile-bitfields" } */ extern void abort (void); #define test_type unsigned long long #define MAGIC 0x102030405060708ull typedef struct s{ unsigned char Prefix; test_type Type; }__attribute((__packed__)) ss; volatile ss v; ss g; void __attribute__((noinline)) foo (test_type u) { v.Type = u; } test_type __attribute__((noinline)) bar (void) { return v.Type; } int main() { test_type temp; foo(MAGIC); __builtin_memcpy(&g, (void *)&v, sizeof(g)); if (g.Type != MAGIC) abort (); g.Type = MAGIC; __builtin_memcpy((void *)&v, &g, sizeof(v)); temp = bar(); if (temp != MAGIC) abort (); return 0; }