[Bug rtl-optimization/19943] New: missed optimization: memcpy is invoked with small size known upfront if invoked through inlined function(s)

[yuri at tsoft dot com]

code below produces "memcpy" invocation for wrong_1 and wrong_2 procedures, only
ok procedure hets "memcpy" optimized properly.

Both wrong_1 and wrong_2 should compile to identical code equal to code of "ok".

--begin code--
include <string.h>
char *b;

struct W {
  inline static void wr(char *buf, int sz) {
    ::memcpy(b, buf, sz);
    b += sz;
  }
  inline static void wr(char c) { wr(&c, sizeof(c)); }
};

int wrong_1(char c) { W::wr(&c, 1); }
int wrong_2(char c) { W::wr(c); }
int ok(char c) { ::memcpy(b, &c, 1); }
--end code--

-- 
           Summary: missed optimization: memcpy is invoked with small size
                    known upfront if invoked through inlined function(s)
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: yuri at tsoft dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19943