[Bug rtl-optimization/53417] optimize multiple movb into a single movl

[daniel.marjamaki at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53417

--- Comment #2 from Daniel Marjamäki <daniel.marjamaki at gmail dot com> 2012-05-19 19:44:13 UTC ---
To clarify a little. The objdump output from my code example is:

0000000000000000 <f>:
   0:    48 83 ec 18              sub    $0x18,%rsp
   4:    48 89 e7                 mov    %rsp,%rdi
   7:    c6 04 24 00              movb   $0x0,(%rsp)
   b:    c6 44 24 01 00           movb   $0x0,0x1(%rsp)
  10:    c6 44 24 02 00           movb   $0x0,0x2(%rsp)
  15:    c6 44 24 03 00           movb   $0x0,0x3(%rsp)
  1a:    e8 00 00 00 00           callq  1f <f+0x1f>
  1f:    48 83 c4 18              add    $0x18,%rsp
  23:    c3                       retq   

I guess it would be better ifthose movb was replaced with a movl.