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From: "zhoukaipeng3 at huawei dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/95854] New: ICE in find_bswap_or_nop_1 of
 pass store-merging
Date: Wed, 24 Jun 2020 02:12:42 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 11.0
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X-Bugzilla-Who: zhoukaipeng3 at huawei dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95854

            Bug ID: 95854
           Summary: ICE in find_bswap_or_nop_1 of pass store-merging
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhoukaipeng3 at huawei dot com
  Target Milestone: ---

ICE log:

during GIMPLE pass: store-merging
pr87132.c: In function =E2=80=98main=E2=80=99:
pr87132.c:5:5: internal compiler error: in tree_to_uhwi, at tree.c:7332
    5 | int main()
      |     ^~~~
0xfc2fcf tree_to_uhwi(tree_node const*)
        ../.././gcc/tree.c:7332
0xfc2fcf tree_to_uhwi(tree_node const*)
        ../.././gcc/tree.c:7330
0x169420b find_bswap_or_nop_1
        ../.././gcc/gimple-ssa-store-merging.c:602
0x1696c1b find_bswap_or_nop_1
        ../.././gcc/gimple-ssa-store-merging.c:589
0x1696c1b process_store
        ../.././gcc/gimple-ssa-store-merging.c:4773
0x1696c1b execute
        ../.././gcc/gimple-ssa-store-merging.c:4996


Command: gcc -S -march=3Darmv8.5-a+sve2 -fno-vect-cost-model -fno-tree-scev=
-cprop
 -O3 -ftracer pr87132.c

GCC version: gcc version 11.0.0 20200618 (experimental) (GCC)

The problem occurs in find_bswap_or_nop_1.
The stmt is "_27 =3D BIT_FIELD_REF <vect__2.16_92, 32, POLY_INT_CST [96, 12=
8]>".=20
So "tree_to_uhwi (TREE_OPERAND (rhs1, 2))" failed.

I plan to add a judgement before to make sure both TREE_OPERAND (rhs1, 1) a=
nd
TREE_OPERAND (rhs1, 2) are INTEGER_CST.=