/* { dg-options "-m64 -Os" } */ /* { dg-final { scan-assembler-not " orq\t" } } */ /* Radar 6020402 - GCC 4.2.1/x86_64 coalesces accesses to 32-bit bitfield and adjacent volatile qualified "int" embedded in a struct. This test case makes sure that a 64-bit OR is not used to store to the bit field "a", which would interfere with the volatile field "i". */ typedef struct { long l; unsigned a:1, b:31; volatile unsigned i; } S; S s; void f() { s.a = 1; }