[Bug inline-asm/21249] New: incorrect code generation for rdtsc on x86_64

[tfautre at pandora dot be]

The following inline assembly is generating correct code on x86 but not on
x86_64 (Counter is a uint64_t):

asm volatile ( "rdtsc" : "=A" (Counter) );

-- 
           Summary: incorrect code generation for rdtsc on x86_64
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: inline-asm
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tfautre at pandora dot be
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: x86_64-pc-linux-gnu
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21249