[Bug target/95683] New: internal compiler error: in riscv_gpr_save_operation_p, at config/riscv/riscv.c:5219

["kito.cheng at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95683

            Bug ID: 95683
           Summary: internal compiler error: in
                    riscv_gpr_save_operation_p, at
                    config/riscv/riscv.c:5219
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kito.cheng at gmail dot com
  Target Milestone: ---
            Target: riscv64-unknown-elf

Report by Pat Pannuto at github:
https://github.com/riscv/riscv-gcc/issues/190

Testcase:

void a() {
  asm(""
      :
      :
      : "a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "t0", "t1", "t2", "t3",
        "t4", "t5", "t6", "ra");
}

Error message:
during RTL pass: ira
/scratch1/kitoc/riscv-gnu-workspace/riscv-gnu-toolchain-trunk/riscv-gcc/gcc/testsuite/gcc.target/riscv/pr95252-2.c:
In function 'a':
/scratch1/kitoc/riscv-gnu-workspace/riscv-gnu-toolchain-trunk/riscv-gcc/gcc/testsuite/gcc.target/riscv/pr95252-2.c:10:1:
internal compiler error: in riscv_gpr_save_operation_p, at
config/riscv/riscv.c:5219
   10 | }
      | ^
0x1662745 riscv_gpr_save_operation_p(rtx_def*)
       
../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/config/riscv/riscv.c:5219
0x1a6829d gpr_save_operation_1
       
../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/config/riscv/predicates.md:213
0x1a682cf gpr_save_operation(rtx_def*, machine_mode)
       
../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/config/riscv/predicates.md:220
0x1a7e441 recog(rtx_def*, rtx_insn*, int*)
       
../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/config/riscv/riscv.md:2499
0x10cdd2c recog_memoized
        ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/recog.h:167
0x10d6dd8 elimination_costs_in_insn
        ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/reload1.c:3525
0x10d1aa1 calculate_elim_costs_all_insns()
        ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/reload1.c:1604
0xeba7fc ira_costs()
        ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/ira-costs.c:2293
0xeb0b2d ira_build()
        ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/ira-build.c:3432
0xea6877 ira
        ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/ira.c:5353
0xea70f4 execute
        ../../../../riscv-gnu-toolchain-trunk/riscv-gcc/gcc/ira.c:5666
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.