[Bug target/112337] New: arm: ICE in arm_effective_regno

[stammark at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112337

            Bug ID: 112337
           Summary: arm: ICE in arm_effective_regno
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stammark at gcc dot gnu.org
  Target Milestone: ---

Hi all,

I found this ICE when compiling CMSIS-NN with latest trunk:

./build-arm-eabi-armv8.1-m.main+mve.fp+fp.dp/install/bin/arm-eabi-gcc
-mcpu=cortex-m55
~/gnu/CMSIS-NN/Source/NNSupportFunctions/arm_nn_depthwise_conv_nt_t_padded_s8.c
-I ~/gnu/CMSIS-NN/Include/ -O3 -S
during RTL pass: ira
/home/stamar01/gnu/CMSIS-NN/Source/NNSupportFunctions/arm_nn_depthwise_conv_nt_t_padded_s8.c:
In function 'arm_nn_depthwise_conv_nt_t_padded_s8':
/home/stamar01/gnu/CMSIS-NN/Source/NNSupportFunctions/arm_nn_depthwise_conv_nt_t_padded_s8.c:172:1:
internal compiler error: in arm_effective_regno, at config/arm/arm.cc:13671
  172 | }
      | ^
0x1b590f2 arm_effective_regno
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/config/arm/arm.cc:13671
0x1b5923a mve_vector_mem_operand(machine_mode, rtx_def*, bool)
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/config/arm/arm.cc:13701
0x23015c2 mve_memory_operand(rtx_def*, machine_mode)
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/config/arm/predicates.md:39
0x23d79fa recog_235
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/config/arm/mve.md:3636
0x241db9c recog_287
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/config/arm/neon.md:6161
0x24540af recog_344
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/config/arm/mve.md:6390
0x2459355 recog(rtx_def*, rtx_insn*, int*)
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/config/arm/sync.md:462
0x15663f5 insn_invalid_p(rtx_insn*, bool)
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/recog.cc:358
0x15667ad verify_changes(int)
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/recog.cc:469
0x1350f89 equiv_can_be_consumed_p
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/ira-costs.cc:1767
0x13518f0 calculate_equiv_gains
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/ira-costs.cc:1887
0x1351fbe find_costs_and_classes
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/ira-costs.cc:2007
0x135404c ira_costs()
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/ira-costs.cc:2564
0x1347e82 ira_build()
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/ira-build.cc:3481
0x133d895 ira
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/ira.cc:5793
0x133e215 execute
        /home/stamar01/gnu/v8.X-M/src/gcc/gcc/ira.cc:6117
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

opening this up in GDB I see that:

#1  0x0000000001b590f3 in arm_effective_regno (op=0x7ffff6e130a8, strict=false)
at /home/stamar01/gnu/v8.X-M/src/gcc/gcc/config/arm/arm.cc:13671
13671     gcc_assert (REG_P (op));
(gdb) p debug_rtx (op)
(mem/f/c:SI (plus:SI (reg/f:SI 103 afp)
        (const_int 28 [0x1c])) [2 output_bias+0 S4 A32])


And slightly further up:

#3  0x00000000023015c3 in mve_memory_operand (op=0x7ffff6e24b70,
mode=E_V4SImode) at
/home/stamar01/gnu/v8.X-M/src/gcc/gcc/config/arm/predicates.md:39
39                          && mve_vector_mem_operand (GET_MODE (op), XEXP (op,
0),
(gdb) p debug_rtx (op)
(mem:V4SI (post_inc:SI (mem/f/c:SI (plus:SI (reg/f:SI 103 afp)
                (const_int 28 [0x1c])) [2 output_bias+0 S4 A32])) [0
MEM[(int[4] *)bias_176]+0 S16 A32])



I've started a bisect.