[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 Bug 77485 depends on bug 33562, which changed state. Bug 33562 Summary: [6 Regression] aggregate DSE disabled https://gcc.gnu.org/bugzilla/show_bug.cgi?id=33562 What|Removed |Added

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #16 from Jeffrey A. Law --- Author: law Date: Mon Jan 16 23:43:05 2017 New Revision: 244509 URL: https://gcc.gnu.org/viewcvs?rev=244509=gcc=rev Log: 2017-01-16 Jeff Law PR tree-optimization/79090

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #15 from Jeffrey A. Law --- Author: law Date: Sat Jan 14 06:16:23 2017 New Revision: 244461 URL: https://gcc.gnu.org/viewcvs?rev=244461=gcc=rev Log: PR tree-optimization/33562 PR tree-optimization/61912 PR

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 Bug 77485 depends on bug 33562, which changed state. Bug 33562 Summary: [5/6 Regression] aggregate DSE disabled https://gcc.gnu.org/bugzilla/show_bug.cgi?id=33562 What|Removed |Added

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 Bug 77485 depends on bug 33562, which changed state. Bug 33562 Summary: [5/6 Regression] aggregate DSE disabled https://gcc.gnu.org/bugzilla/show_bug.cgi?id=33562 What|Removed |Added

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #14 from Jeffrey A. Law --- Author: law Date: Fri Jan 13 15:46:22 2017 New Revision: 23 URL: https://gcc.gnu.org/viewcvs?rev=23=gcc=rev Log: PR tree-optimization/61912 PR tree-optimization/77485 *

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #12 from Jeffrey A. Law --- Author: law Date: Fri Jan 13 15:37:09 2017 New Revision: 21 URL: https://gcc.gnu.org/viewcvs?rev=21=gcc=rev Log: PR tree-optimization/33562 PR tree-optimization/61912 PR

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #13 from Jeffrey A. Law --- Author: law Date: Fri Jan 13 15:42:08 2017 New Revision: 22 URL: https://gcc.gnu.org/viewcvs?rev=22=gcc=rev Log: PR tree-optimization/33562 PR tree-optimization/61912 PR

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 Jeffrey A. Law changed: What|Removed |Added Status|NEW |RESOLVED Resolution|---

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #10 from Jeffrey A. Law --- [0.00%]: MEM[(char[170] *)& + 30B] = {}; .buf[0] = 48; [ ... ]

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #9 from Jeffrey A. Law --- That ought to be significantly easier and cleaner. I really didn't like the transformation into memset. I'll give that a whirl tomorrow.

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #8 from rguenther at suse dot de --- On Wed, 14 Dec 2016, law at redhat dot com wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 > > --- Comment #7 from Jeffrey A. Law --- > There was a bit of cruft and a missed

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #7 from Jeffrey A. Law --- There was a bit of cruft and a missed ADDR_EXPR in that last fragment of gimple code. ;; basic block 2, loop depth 0, count 0, freq 0, maybe hot ;;prev block 0, next block 1, flags: (NEW, REACHABLE,

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #6 from Jeffrey A. Law --- So DSE involving CONSTRUCTOR nodes is a bit of a pain. The way CONSTRUCTOR nodes are used past gimplification is awkward for DSE. Specifically we have a CONSTRUCTOR node with no ELTS. The semantics of

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #5 from rguenther at suse dot de --- On Thu, 8 Dec 2016, law at redhat dot com wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 > > --- Comment #4 from Jeffrey A. Law --- > So my patches for 33562 will detect the

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #4 from Jeffrey A. Law --- So my patches for 33562 will detect the partial dead store in "foo", but I never wrote the bits to narrow partial dead stores. The difficulty in optimizing this particular case will be rewriting the

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 Jeffrey A. Law changed: What|Removed |Added CC||law at redhat dot com --- Comment #3

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 --- Comment #2 from petschy at gmail dot com --- I agree that the generic case can become quite complicated: if after the memset, the individual values are written with gaps between them, or multiple contiguous chunks with gaps between them, it's

[Bug tree-optimization/77485] Missed dead store elimination of aggregate store followed by partial stores

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77485 Richard Biener changed: What|Removed |Added Keywords||missed-optimization