[Bug rtl-optimization/39543] [4.4 Regression] Reload failure on mplayer from SVN

[jakub at gcc dot gnu dot org]

------- Comment #6 from jakub at gcc dot gnu dot org  2009-03-25 15:49 -------
Created an attachment (id=17540)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17540&action=view)
gcc44-pr39543.patch

Untested patch that cures all the 3 testcases by forward propagation into asm
operands, as long as the propagation doesn't increase the number of needed
registers.
As I need to update a bunch of locations at once, I can't use
try_fwprop_subst.  There are 2 things that try_fwprop_subst does that I'm not
doing, one is the rtx_cost (SET_SRC (set), SET, speed) > old_cost check
(I wonder whether it is needed for asms at all and if yes, how to actually do
it) and the update_df stuff (I'm never adding notes for asms, but for
successful
change I don't know how to inform df about the changes, if I need to do that.
Paolo, any ideas?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39543