[Bug target/27440] [4.3/4.4 regression] code quality regression due to ivopts

[steven at gcc dot gnu dot org]

------- Comment #15 from steven at gcc dot gnu dot org  2009-12-30 16:39 -------
With "GCC: (GNU) 4.5.0 20091228 (experimental) [trunk revision 155486]" I get
identical code at -O2 with and without -fno-ivopts for i686:

.L3:
        movl    %ebx, (%ecx,%eax,4)
        addl    $1, %eax
        cmpl    %edx, %eax
        jb      .L3


For x86_64 at -O2, there is still the extra mov. The extra mov is not there
with -Os (with and without -fno-ivopts).

Since the mov on x86_64 is essentially free, I consider this fixed for GCC
4.5.0.


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|3.4.6                       |3.4.6 4.5.0
            Summary|[4.3/4.4/4.5 regression]    |[4.3/4.4 regression] code
                   |code quality regression due |quality regression due to
                   |to ivopts                   |ivopts


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27440