diff options
Diffstat (limited to 'gcc/testsuite/g++.dg/init/new16.C')
-rw-r--r-- | gcc/testsuite/g++.dg/init/new16.C | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/init/new16.C b/gcc/testsuite/g++.dg/init/new16.C new file mode 100644 index 000000000..c49f13f83 --- /dev/null +++ b/gcc/testsuite/g++.dg/init/new16.C @@ -0,0 +1,38 @@ +// { dg-do run } +// { dg-options "-O2 -fstrict-aliasing" } + +// Test that we don't let TBAA reorder an assignment across a +// placement new. +// See PR 29286. + +typedef __SIZE_TYPE__ size_t; + +inline void* operator new(size_t, void* __p) throw() { return __p; } + +void __attribute__((noinline)) bar() {} + +long __attribute__((noinline)) foo(double *p, int n) +{ + long *f; + for (int i=0; i<n; ++i) + { + int *l = (int *)p; + *l = 0; + f = new (p) long; + *f = -1; + } + bar (); + return *f; +} + +extern "C" void abort(void); +int main() +{ + union { + int i; + long l; + } u; + if (foo((double *)&u, 1) != -1) + abort (); + return 0; +} |