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* [Bug tree-optimization/15458] Combine ~ and ^. [not found] <bug-15458-5009@http.gcc.gnu.org/bugzilla/> @ 2005-11-30 17:32 ` pinskia at gcc dot gnu dot org 2005-11-30 17:41 ` pinskia at gcc dot gnu dot org ` (3 subsequent siblings) 4 siblings, 0 replies; 10+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-11-30 17:32 UTC (permalink / raw) To: gcc-bugs ------- Comment #4 from pinskia at gcc dot gnu dot org 2005-11-30 17:32 ------- Actually it is better for ~(a ^ CST) to come out as a ^ ~CST. Right now we actually already implement ~(a^CST) as a ^ ~CST. So we need just to implement (~a) ^ CST as a ^ ~CST. In fact this is what simplify_rtx does. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 ^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15458] Combine ~ and ^. [not found] <bug-15458-5009@http.gcc.gnu.org/bugzilla/> 2005-11-30 17:32 ` [Bug tree-optimization/15458] Combine ~ and ^ pinskia at gcc dot gnu dot org @ 2005-11-30 17:41 ` pinskia at gcc dot gnu dot org 2005-12-04 4:27 ` pinskia at gcc dot gnu dot org ` (2 subsequent siblings) 4 siblings, 0 replies; 10+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-11-30 17:41 UTC (permalink / raw) To: gcc-bugs ------- Comment #5 from pinskia at gcc dot gnu dot org 2005-11-30 17:41 ------- ~(a^CST) is done in fold_unary with the comment of: /* Convert ~(X ^ Y) to ~X ^ Y or X ^ ~Y if ~X or ~Y simplify. */ Only (~a^~b) is simplified. That can be expanded to: (~a^b) if ~b simplifies, simplify the expression. likewise for (a^~b) (if ~a simplifies, simplify the expression). I am going to implement this. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|unassigned at gcc dot gnu |pinskia at gcc dot gnu dot |dot org |org Status|NEW |ASSIGNED http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 ^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15458] Combine ~ and ^. [not found] <bug-15458-5009@http.gcc.gnu.org/bugzilla/> 2005-11-30 17:32 ` [Bug tree-optimization/15458] Combine ~ and ^ pinskia at gcc dot gnu dot org 2005-11-30 17:41 ` pinskia at gcc dot gnu dot org @ 2005-12-04 4:27 ` pinskia at gcc dot gnu dot org 2006-10-29 17:51 ` sayle at gcc dot gnu dot org 2006-10-29 20:27 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 10+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-12-04 4:27 UTC (permalink / raw) To: gcc-bugs ------- Comment #6 from pinskia at gcc dot gnu dot org 2005-12-04 04:27 ------- I am no longer going to fix the fold issue, it is too much hasle to get this fixed. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|pinskia at gcc dot gnu dot |unassigned at gcc dot gnu |org |dot org Status|ASSIGNED |NEW http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 ^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15458] Combine ~ and ^. [not found] <bug-15458-5009@http.gcc.gnu.org/bugzilla/> ` (2 preceding siblings ...) 2005-12-04 4:27 ` pinskia at gcc dot gnu dot org @ 2006-10-29 17:51 ` sayle at gcc dot gnu dot org 2006-10-29 20:27 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 10+ messages in thread From: sayle at gcc dot gnu dot org @ 2006-10-29 17:51 UTC (permalink / raw) To: gcc-bugs ------- Comment #7 from sayle at gcc dot gnu dot org 2006-10-29 17:51 ------- Subject: Bug 15458 Author: sayle Date: Sun Oct 29 17:51:07 2006 New Revision: 118152 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=118152 Log: PR tree-optimization/15458 * fold-const.c (fold_binary): Optimize ~X ^ C as X ^ ~C, where C is a constant. * gcc.dg/fold-xornot-1.c: New test case. Added: trunk/gcc/testsuite/gcc.dg/fold-xornot-1.c Modified: trunk/gcc/ChangeLog trunk/gcc/fold-const.c trunk/gcc/testsuite/ChangeLog -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 ^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15458] Combine ~ and ^. [not found] <bug-15458-5009@http.gcc.gnu.org/bugzilla/> ` (3 preceding siblings ...) 2006-10-29 17:51 ` sayle at gcc dot gnu dot org @ 2006-10-29 20:27 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 10+ messages in thread From: pinskia at gcc dot gnu dot org @ 2006-10-29 20:27 UTC (permalink / raw) To: gcc-bugs ------- Comment #8 from pinskia at gcc dot gnu dot org 2006-10-29 20:27 ------- Fixed. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED Target Milestone|--- |4.3.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 ^ permalink raw reply [flat|nested] 10+ messages in thread
[parent not found: <bug-15458-4@http.gcc.gnu.org/bugzilla/>]
* [Bug tree-optimization/15458] Combine ~ and ^. [not found] <bug-15458-4@http.gcc.gnu.org/bugzilla/> @ 2014-10-31 4:02 ` pinskia at gcc dot gnu.org 0 siblings, 0 replies; 10+ messages in thread From: pinskia at gcc dot gnu.org @ 2014-10-31 4:02 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 Bug 15458 depends on bug 15459, which changed state. Bug 15459 Summary: [meta-bug] there should be a tree combiner like the rtl one https://gcc.gnu.org/bugzilla/show_bug.cgi?id=15459 What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED ^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15458] New: Combine ~ and ^. @ 2004-05-16 1:55 kazu at cs dot umass dot edu 2004-05-16 10:02 ` [Bug tree-optimization/15458] " pinskia at gcc dot gnu dot org ` (3 more replies) 0 siblings, 4 replies; 10+ messages in thread From: kazu at cs dot umass dot edu @ 2004-05-16 1:55 UTC (permalink / raw) To: gcc-bugs unsigned int xornot (unsigned int a) { unsigned int b = a ^ 0xffff; unsigned int c = ~b; return c; } unsigned int notxor (unsigned int a) { unsigned int b = ~a; unsigned int c = b ^ 0xffff; return c; } The last tree-ssa form looks like: ;; Function xornot (xornot) xornot (a) { unsigned int c; unsigned int b; <bb 0>: b_2 = a_1 ^ 65535; c_3 = ~b_2; return c_3; } ;; Function notxor (notxor) notxor (a) { unsigned int c; unsigned int b; <bb 0>: b_2 = ~a_1; c_3 = b_2 ^ 65535; return c_3; } -- Summary: Combine ~ and ^. Product: gcc Version: 3.5.0 Status: UNCONFIRMED Keywords: pessimizes-code Severity: enhancement Priority: P2 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: kazu at cs dot umass dot edu CC: gcc-bugs at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 ^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15458] Combine ~ and ^. 2004-05-16 1:55 [Bug tree-optimization/15458] New: " kazu at cs dot umass dot edu @ 2004-05-16 10:02 ` pinskia at gcc dot gnu dot org 2004-05-16 10:49 ` pinskia at gcc dot gnu dot org ` (2 subsequent siblings) 3 siblings, 0 replies; 10+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-05-16 10:02 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-15 12:23 ------- Confirmed. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Last reconfirmed|0000-00-00 00:00:00 |2004-05-15 12:23:00 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 ^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15458] Combine ~ and ^. 2004-05-16 1:55 [Bug tree-optimization/15458] New: " kazu at cs dot umass dot edu 2004-05-16 10:02 ` [Bug tree-optimization/15458] " pinskia at gcc dot gnu dot org @ 2004-05-16 10:49 ` pinskia at gcc dot gnu dot org 2004-05-17 18:53 ` pinskia at gcc dot gnu dot org 2004-06-02 21:14 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 10+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-05-16 10:49 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- BugsThisDependsOn| |15459 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 ^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15458] Combine ~ and ^. 2004-05-16 1:55 [Bug tree-optimization/15458] New: " kazu at cs dot umass dot edu 2004-05-16 10:02 ` [Bug tree-optimization/15458] " pinskia at gcc dot gnu dot org 2004-05-16 10:49 ` pinskia at gcc dot gnu dot org @ 2004-05-17 18:53 ` pinskia at gcc dot gnu dot org 2004-06-02 21:14 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 10+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-05-17 18:53 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-05-17 02:05 ------- Will be fix by PR 15459 when fold is able to optimize ~(a<D1109>_1 ^ 65535) into ~a<D1104>_1 ^ 65535 -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 ^ permalink raw reply [flat|nested] 10+ messages in thread
* [Bug tree-optimization/15458] Combine ~ and ^. 2004-05-16 1:55 [Bug tree-optimization/15458] New: " kazu at cs dot umass dot edu ` (2 preceding siblings ...) 2004-05-17 18:53 ` pinskia at gcc dot gnu dot org @ 2004-06-02 21:14 ` pinskia at gcc dot gnu dot org 3 siblings, 0 replies; 10+ messages in thread From: pinskia at gcc dot gnu dot org @ 2004-06-02 21:14 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-06-02 21:14 ------- I should note that the RTL level does this optimization. -- What |Removed |Added ---------------------------------------------------------------------------- BugsThisDependsOn| |15785 Keywords| |TREE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15458 ^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2014-10-31 4:02 UTC | newest] Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <bug-15458-5009@http.gcc.gnu.org/bugzilla/> 2005-11-30 17:32 ` [Bug tree-optimization/15458] Combine ~ and ^ pinskia at gcc dot gnu dot org 2005-11-30 17:41 ` pinskia at gcc dot gnu dot org 2005-12-04 4:27 ` pinskia at gcc dot gnu dot org 2006-10-29 17:51 ` sayle at gcc dot gnu dot org 2006-10-29 20:27 ` pinskia at gcc dot gnu dot org [not found] <bug-15458-4@http.gcc.gnu.org/bugzilla/> 2014-10-31 4:02 ` pinskia at gcc dot gnu.org 2004-05-16 1:55 [Bug tree-optimization/15458] New: " kazu at cs dot umass dot edu 2004-05-16 10:02 ` [Bug tree-optimization/15458] " pinskia at gcc dot gnu dot org 2004-05-16 10:49 ` pinskia at gcc dot gnu dot org 2004-05-17 18:53 ` pinskia at gcc dot gnu dot org 2004-06-02 21:14 ` pinskia at gcc dot gnu dot org
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