[Bug target/111533] New: [14 Regression] ICE: RTL check: expected code 'reg', have 'const_int' in rhs_regno, at rtl.h:1934

[patrick at rivosinc dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111533

            Bug ID: 111533
           Summary: [14 Regression] ICE: RTL check: expected code 'reg',
                    have 'const_int' in rhs_regno, at rtl.h:1934
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: patrick at rivosinc dot com
  Target Milestone: ---

Broken on trunk: r14-4211-g29862e21f6d

Bisected to/Caused by: r14-3508-ge030af3e6f6

rv64gcv fails to build glibc with --enable-checking=rtl
This same failure/backtrace shows up on rv32gc with testcases like
gcc.target/riscv/rvv/autovec/reduc/reduc_call-1.c with --enable-checking=rtl.

Backtrace (from run using r14-4211-g29862e21f6d):

during RTL pass: vsetvl
res_debug.c: In function '__dn_count_labels':
res_debug.c:1050:1: internal compiler error: RTL check: expected code 'reg',
have 'const_int' in rhs_regno, at rtl.h:1934
 1050 | }
      | ^
0x90a441 rtl_check_failed_code1(rtx_def const*, rtx_code, char const*, int,
char const*)
        ../../../gcc/gcc/rtl.cc:770
0x941ad7 rhs_regno(rtx_def const*)
        ../../../gcc/gcc/rtl.h:1934
0x942458 rhs_regno(rtx_def const*)
        ../../../gcc/gcc/config/riscv/riscv-vsetvl.cc:314
0x942458 anticipatable_occurrence_p
        ../../../gcc/gcc/config/riscv/riscv-vsetvl.cc:348
0x942458 pass_vsetvl::compute_local_properties()
        ../../../gcc/gcc/config/riscv/riscv-vsetvl.cc:3215
0x1680d25 pass_vsetvl::vsetvl_fusion()
        ../../../gcc/gcc/config/riscv/riscv-vsetvl.cc:3438
0x1683590 pass_vsetvl::lazy_vsetvl()
        ../../../gcc/gcc/config/riscv/riscv-vsetvl.cc:4373
0x16837a7 pass_vsetvl::execute(function*)
        ../../../gcc/gcc/config/riscv/riscv-vsetvl.cc:4413
0x16837a7 pass_vsetvl::execute(function*)
        ../../../gcc/gcc/config/riscv/riscv-vsetvl.cc:4394
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