[Bug tree-optimization/97849] [10 Regression] aarch64: ICE (segfault) during GIMPLE pass: ifcvt since r10-3543-gf30b3d28

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97849

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Alex Coplan
<acoplan@gcc.gnu.org>:

https://gcc.gnu.org/g:ad8c55c1df32839cf74704b68a072772b14bd1e2

commit r10-9642-gad8c55c1df32839cf74704b68a072772b14bd1e2
Author: Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
Date:   Tue Nov 24 06:50:53 2020 +0530

    tree-opt: Fix segfault in tree-if-conv.c with -march=armv8.2-a+sve
[PR97849]

    The issue here is that rpo vn may eliminate target ssa_name referred to in
    redundant_ssa_names, and thus ifcvt_local_dce may replace candidate
    ssa_name with invalid ssa_name resulting in incorrect IR. The patch simply
    does ssa_name replacement before calling do_rpo_vn, which fixes the issue.

    gcc/
    2020-11-24  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

            PR tree-optimization/97849
            * tree-if-conv.c (tree_if_conversion): Move ssa_name
            replacement code from ifcvt_local_dce to this function
            before calling do_rpo_vn.

    gcc/testsuite/
    2020-11-24  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

            PR tree-optimization/97849
            * gcc.dg/tree-ssa/pr97849.c: New test.