Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/g++.dg/tree-ssa/strlenopt-2.C @ 145:1830386684a0
gcc-9.2.0
author | anatofuz |
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date | Thu, 13 Feb 2020 11:34:05 +0900 |
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/* PR tree-optimization/92765 - wrong code for strcmp of a union member { dg-do run } { dg-options "-O2 -Wall" } */ typedef __SIZE_TYPE__ size_t; inline void* operator new (size_t, void *p) { return p; } struct A { char a[2]; char b[2]; char c[2]; A () { a[0] = 0; b[0] = 0; c[0] = 0; }; ~A () { } }; struct B { char d[6]; B () { d[0] = 0; d[2] = 0; } ~B () { } }; __attribute__((noipa)) void sink (void *) { } __attribute__((noipa)) void copy (char *d, const char *s) { while ((*d++ = *s++)); } __attribute__((noipa)) void store_and_compare (void *p) { A *a = new (p) A (); sink (&a->b); a->~A (); B *b = new (p) B (); char *q = &b->d[2]; copy (q, "abc"); if (__builtin_strcmp (q, "abc")) __builtin_abort (); b->~B (); } int main () { char a [sizeof (A) > sizeof (B) ? sizeof (A) : sizeof (B)]; store_and_compare (a); return 0; }