[Bug tree-optimization/89789] [9 Regression] Compile time hog during RPO VN
rguenth at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Mon Mar 25 13:54:00 GMT 2019
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89789
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Mar 25 13:53:50 2019
New Revision: 269917
URL: https://gcc.gnu.org/viewcvs?rev=269917&root=gcc&view=rev
Log:
2019-03-25 Richard Biener <rguenther@suse.de>
PR tree-optimization/89789
* tree-ssa-sccvn.c (set_ssa_val_to): Do not allow lattice
changes from non-undefined back to undefined.
* gcc.dg/torture/pr89789.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/torture/pr89789.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-sccvn.c
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