http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16458
Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|unassigned at gcc dot |bergner at gcc dot gnu.org
|gnu.org |
--- Comment #6 from Peter Bergner <bergner at gcc dot gnu.org> 2012-01-27
15:12:15 UTC ---
Created attachment 26481
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26481
Updated patch to eliminate redudant compares
Here's a slightly updated patch that allows the compares to be cse'd, but also
doesn't disable the generation of record form instructions (ie, instructions
that also set cr0 implicitly).
I was mistaken in my Comment #5 above. We can sometime handle:
if (*a == *b)
...
else if (*a > *b)
...
and:
switch (*index)
...
depending on whether expand creates the type expression via REG_EXPR or not.
In some cases it does and in others it doesn't. That's not a limitation in
this patch, but in expand. That can can be handled in separate patch.
