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Subject: [Bug tree-optimization/97849] [10/11 Regression] aarch64: ICE
 (segfault) during GIMPLE pass: ifcvt since r10-3543-gf30b3d28
Date: Tue, 24 Nov 2020 01:29:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97849

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Prathamesh Kulkarni
<prathamesh3492@gcc.gnu.org>:

https://gcc.gnu.org/g:5700973f4a30762b4fc21687bb5f7843e55da2e4

commit r11-5268-g5700973f4a30762b4fc21687bb5f7843e55da2e4
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=3Darmv8.2-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 sim=
ply
    does ssa_name replacement before calling do_rpo_vn, which fixes the iss=
ue.

    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.=