[Bug middle-end/61762] New: failure to optimize memcpy from constant string

[froydnj at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61762

            Bug ID: 61762
           Summary: failure to optimize memcpy from constant string
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: froydnj at gcc dot gnu.org

There's probably a duplicate of this, but GCC HEAD on the following testcase:

unsigned int f()
{
  static const char string[] = "Private";

  unsigned int priv;
  __builtin_memcpy(&priv, &string[0], sizeof(priv));
  return priv;
}

produces for x86-64:

f:
.LFB0:
    .cfi_startproc
    movl    _ZZ1fvE6string(%rip), %eax
    ret
    .cfi_endproc

Compare clang (~3.0) for x86-64:

f:
.Ltmp0:
    .cfi_startproc
# BB#0:
    movl    $1986622032, %eax       # imm = 0x76697250
    ret