[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 --- Comment #21 from Steve Ellcey --- (In reply to Richard Biener from comment #20) > (In reply to Steve Ellcey from comment #19) > It should have been fixed by r273732 (checked with a cc1 cross to aarch64, > albeit on a not clean tree...) OK, I rested with top-of-tree that includes this patch and the tests are not failing for me now. My earlier testing did not have this patch in it.
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 --- Comment #20 from Richard Biener --- (In reply to Steve Ellcey from comment #19) > Should this defect be reopened? One of the tests that was added is failing > for me on aarch64. > > FAIL: g++.dg/tree-ssa/pr83518.C -std=gnu++98 scan-tree-dump optimized > "return 15;" > FAIL: g++.dg/tree-ssa/pr83518.C -std=gnu++14 scan-tree-dump optimized > "return 15;" > FAIL: g++.dg/tree-ssa/pr83518.C -std=gnu++17 scan-tree-dump optimized > "return 15;" It should have been fixed by r273732 (checked with a cc1 cross to aarch64, albeit on a not clean tree...)
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 Steve Ellcey changed: What|Removed |Added CC||sje at gcc dot gnu.org --- Comment #19 from Steve Ellcey --- Should this defect be reopened? One of the tests that was added is failing for me on aarch64. FAIL: g++.dg/tree-ssa/pr83518.C -std=gnu++98 scan-tree-dump optimized "return 15;" FAIL: g++.dg/tree-ssa/pr83518.C -std=gnu++14 scan-tree-dump optimized "return 15;" FAIL: g++.dg/tree-ssa/pr83518.C -std=gnu++17 scan-tree-dump optimized "return 15;"
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 Richard Biener changed: What|Removed |Added Status|REOPENED|RESOLVED Resolution|--- |FIXED --- Comment #17 from Richard Biener --- Fixed.
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 --- Comment #18 from Richard Biener --- Author: rguenth Date: Tue Jul 23 10:00:24 2019 New Revision: 273732 URL: https://gcc.gnu.org/viewcvs?rev=273732=gcc=rev Log: 2019-07-23 Richard Biener PR tree-optimization/83518 * tree-ssa-sccvn.c (vn_reference_lookup_3): Handle aggregate init from a constant even when partial defs are already recorded. c/ * gimple-parser.c (c_parser_parse_gimple_body): When we have a CFG also rebuild cgraph edges. * gcc.dg/tree-ssa/ssa-fre-79.c: New testcase. Added: trunk/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-79.c Modified: trunk/gcc/ChangeLog trunk/gcc/c/ChangeLog trunk/gcc/c/gimple-parser.c trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-ssa-sccvn.c
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 Wilco changed: What|Removed |Added Status|RESOLVED|REOPENED Resolution|FIXED |--- --- Comment #16 from Wilco --- Reopen since it still fails on AArch64.
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 --- Comment #15 from Wilco --- (In reply to Richard Biener from comment #14) > Yeah. It is > >[local count: 178992762]: > arr = *.LC0; > arr[0] = 5; > vect__56.15_75 = MEM [(int *)]; > > I'll fix that (well, I'll try). Right, it's fine with -fno-tree-vectorize on AArch64.
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 --- Comment #14 from Richard Biener --- Yeah. It is [local count: 178992762]: arr = *.LC0; arr[0] = 5; vect__56.15_75 = MEM [(int *)]; I'll fix that (well, I'll try).
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 --- Comment #13 from rguenther at suse dot de --- On Tue, 9 Jul 2019, wilco at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 > > Wilco changed: > >What|Removed |Added > > CC||wilco at gcc dot gnu.org > > --- Comment #12 from Wilco --- > (In reply to Richard Biener from comment #11) > > Fixed on trunk, not something for backporting. > > The pr83518.C test fails on AArch64 and Arm (and presumably more targets). Are > you missing options or relying on specific vector widths? I'm not relying on vectorization (it passes for me with -fno-tree-vectorize). But I'm relying on unrolling. And also on constant folding - maybe this is the usual arr[0] = 5; arr[1] = 4; ... vs. arr = .LC0; thing?
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 Wilco changed: What|Removed |Added CC||wilco at gcc dot gnu.org --- Comment #12 from Wilco --- (In reply to Richard Biener from comment #11) > Fixed on trunk, not something for backporting. The pr83518.C test fails on AArch64 and Arm (and presumably more targets). Are you missing options or relying on specific vector widths?
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 Richard Biener changed: What|Removed |Added Status|ASSIGNED|RESOLVED Known to work||10.0 Resolution|--- |FIXED Summary|[8/9/10 Regression] Missing |[8/9 Regression] Missing |optimization: useless |optimization: useless |instructions should be |instructions should be |dropped |dropped Known to fail||8.3.0, 9.1.0 --- Comment #11 from Richard Biener --- Fixed on trunk, not something for backporting.
[Bug tree-optimization/83518] [8/9 Regression] Missing optimization: useless instructions should be dropped
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83518 Jeffrey A. Law changed: What|Removed |Added CC||law at redhat dot com Target Milestone|9.0 |10.0
