https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100200

--- Comment #1 from Alex Coplan <acoplan at gcc dot gnu.org> ---
Backtrace is:

    #0 0x4340bc0 in aarch64_plus_immediate(rtx_def*, machine_mode)
/home/alecop01/toolchain/src/gcc/gcc/config/aarch64/predicates.md:129
    #1 0x2e0d168 in aarch64_rtx_costs
/home/alecop01/toolchain/src/gcc/gcc/config/aarch64/aarch64.c:13000
    #2 0x2e1ae1c in aarch64_rtx_costs_wrapper
/home/alecop01/toolchain/src/gcc/gcc/config/aarch64/aarch64.c:13824
    #3 0x1d97328 in rtx_cost(rtx_def*, machine_mode, rtx_code, int, bool)
/home/alecop01/toolchain/src/gcc/gcc/rtlanal.c:4626
    #4 0x49424bc in notreg_cost /home/alecop01/toolchain/src/gcc/gcc/cse.c:731
    #5 0x495882c in cse_insn /home/alecop01/toolchain/src/gcc/gcc/cse.c:5130
    #6 0x496e198 in cse_extended_basic_block
/home/alecop01/toolchain/src/gcc/gcc/cse.c:6590
    #7 0x496e198 in cse_main /home/alecop01/toolchain/src/gcc/gcc/cse.c:6769
    #8 0x4972808 in rest_of_handle_cse
/home/alecop01/toolchain/src/gcc/gcc/cse.c:7599
    #9 0x4972808 in execute /home/alecop01/toolchain/src/gcc/gcc/cse.c:7642
    #10 0x1b5ec1c in execute_one_pass(opt_pass*)
/home/alecop01/toolchain/src/gcc/gcc/passes.c:2567
    #11 0x1b623b8 in execute_pass_list_1
/home/alecop01/toolchain/src/gcc/gcc/passes.c:2656
    #12 0x1b623f0 in execute_pass_list_1
/home/alecop01/toolchain/src/gcc/gcc/passes.c:2657
    #13 0x1b624d4 in execute_pass_list(function*, opt_pass*)
/home/alecop01/toolchain/src/gcc/gcc/passes.c:2667
    #14 0xc7b2a4 in cgraph_node::expand()
/home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:1830
    #15 0xc7ff24 in expand_all_functions
/home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:1994
    #16 0xc7ff24 in symbol_table::compile()
/home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:2358
    #17 0xc8b81c in symbol_table::compile()
/home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:2271
    #18 0xc8b81c in symbol_table::finalize_compilation_unit()
/home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:2539
    #19 0x1f97478 in compile_file
/home/alecop01/toolchain/src/gcc/gcc/toplev.c:482
    #20 0x68d9b0 in do_compile
/home/alecop01/toolchain/src/gcc/gcc/toplev.c:2201
    #21 0x68d9b0 in toplev::main(int, char**)
/home/alecop01/toolchain/src/gcc/gcc/toplev.c:2340
    #22 0x6910d0 in main /home/alecop01/toolchain/src/gcc/gcc/main.c:39
    #23 0xffff7cc036dc in __libc_start_main
(/lib/aarch64-linux-gnu/libc.so.6+0x206dc)
    #24 0x691b2c  (/data/alecop01/builds/bstrap-ubsan/gcc/cc1+0x691b2c)

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