[Bug bootstrap/44470] [4.6 Regression] Failed to bootstrap with - -with-arch=atom

[hjl dot tools at gmail dot com]

------- Comment #3 from hjl dot tools at gmail dot com  2010-06-09 00:59 -------
The old scheduler:

;;   ======================================================
;;   -- basic block 2 from 37 to 42 -- after reload
;;   ======================================================

;;        0-->    37 [--sp]=bp                         :atom-dual-2c
;;        1-->    44 {cx=0;clobber flags;}             :atom-simple-either
;;        2-->    38 bp=sp                             :atom-simple-either
;;        6-->    26 ax=[bp+0x8]                       :atom-simple-either
;;        6-->    27 dx=[bp+0xc]                       :atom-simple-either
;;        7-->    45 flags=cmp(ax,0)                   :atom-simple-either
;;        8-->    46 strict_low_part=flags!=0          :atom-simple-either
;;        8-->    13 {ax=-ax;clobber flags;}           :atom-simple-either
;;        9-->    11 {dx=cx+dx;clobber flags;}         :atom-simple-either
;;       10-->    12 {dx=-dx;clobber flags;}           :atom-simple-either
;;       10-->    23 use ax                            :nothing
;;       11-->    41 {bp=[sp];sp=sp+0x4;}              :atom-dual-2c
;;       12-->    42 return                            :atom-dual-1c
;;      Ready list (final):  
;;   total time = 12
;;   new head = 37
;;   new tail = 42

The new one:
;;   ======================================================
;;   -- basic block 2 from 37 to 42 -- after reload
;;   ======================================================

;;        0-->    37 [--sp]=bp                         :atom-dual-2c
;;        1-->    44 {cx=0;clobber flags;}             :atom-simple-either
;;        2-->    38 bp=sp                             :atom-simple-either
;;        6-->    26 ax=[bp+0x8]                       :atom-simple-either
;;        6-->    27 dx=[bp+0xc]                       :atom-simple-either
;;        7-->    45 flags=cmp(ax,0)                   :atom-simple-either
;;        8-->    46 strict_low_part=flags!=0          :atom-simple-either
;;        8-->    13 {ax=-ax;clobber flags;}           :atom-simple-either
;;        9-->    41 {bp=[sp];sp=sp+0x4;}              :atom-dual-2c
;;       12-->    11 {dx=cx+dx;clobber flags;}         :atom-simple-either
;;       12-->    12 {dx=-dx;clobber flags;}           :atom-simple-either
;;       13-->    23 use ax                            :nothing
;;       13-->    42 return                            :atom-dual-1c
;;      Ready list (final):  
;;   total time = 13
;;   new head = 37
;;   new tail = 42

It is slower.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44470