Re: [Suggestion] arc: compiler: bug: about an arc compiler's bugwhich is not in gcc main source code.

From: Joern Rennecke
Date: Tue Oct 22 2013 - 22:48:07 EST


On 23 October 2013 03:00, Chen Gang <gang.chen@xxxxxxxxxxx> wrote:

> Binutils (1 issue, ld and as information):
>
> when calling panic(), printk(), or memset() with R_ARC_S21W_PCREL, it may be overflow (I guess it need be R_ARC_S25W_PCREL).
>
> /usr/local/bin/arc-elf32-ld --build-id -X -o .tmp_vmlinux1 -T /android/public-kernel/linux-next/arch/arc/kernel/vmlinux.lds arch/arc/kernel/head.o init/built-in.o --start-group usr/built-in.o arch/arc/built-in.o arch/arc/boot/dts/built-in.o arch/arc/plat-arcfpga/built-in.o arch/arc/plat-tb10x/built-in.o kernel/built-in.o mm/built-in.o fs/built-in.o ipc/built-in.o security/built-in.o crypto/built-in.o block/built-in.o lib/lib.a arch/arc/lib/lib.a /usr/local/lib/gcc/arc-elf32/4.8.0/libgcc.a lib/built-in.o arch/arc/lib/built-in.o /usr/local/lib/gcc/arc-elf32/4.8.0/libgcc.a drivers/built-in.o sound/built-in.o firmware/built-in.o net/built-in.o --end-group
> /usr/local/bin/arc-elf32-ld: Error: Overflow detected in relocation value;
> /usr/local/bin/arc-elf32-ld: Relocation value should be between 1048575 and -1048576 whereas it 2404264
> /usr/local/bin/arc-elf32-ld: Global symbol: "panic".
> /usr/local/bin/arc-elf32-ld:
> Relocation type is:R_ARC_S21W_PCREL
> FileName:arch/arc/built-in.o
> Section Name:.text
> Offset in Section:1716
> /usr/local/bin/arc-elf32-ld: final link failed: Bad value
> make: *** [vmlinux] Error 1

That just means that the image is too large to allow conditional
pc-relative calls (tail/sibcalls) or otherwise.

You can avoid generating them for functions with out a relevant
attribute with -mmedium-calls .



> GCC (2 issues, and gcc information):
>
> CC drivers/rtc/systohc.o
> drivers/rtc/systohc.c: In function 'rtc_set_ntp_time':
> drivers/rtc/systohc.c:44:1: internal compiler error: in arc_ifcvt, at config/arc/arc.c:8315
> }
> ^
> 0x939c94 arc_ifcvt
> ../../gcc/gcc/config/arc/arc.c:8315
> 0x93a394 arc_reorg
> ../../gcc/gcc/config/arc/arc.c:5985
> 0x7517d9 rest_of_handle_machine_reorg
> ../../gcc/gcc/reorg.c:3927
> Please submit a full bug report,
> with preprocessed source if appropriate.
> Please include the complete backtrace with any bug report.
> See <http://gcc.gnu.org/bugs.html> for instructions.
> make[2]: *** [drivers/rtc/systohc.o] Error 1
> make[1]: *** [drivers/rtc] Error 2
> make: *** [drivers] Error 2
>
>
> CC [M] drivers/target/target_core_pr.o
> drivers/target/target_core_pr.c: In function 'target_scsi3_emulate_pr_in':
> drivers/target/target_core_pr.c:4033:1: error: unrecognizable insn:
> }
> ^
> (insn 846 194 196 12 (set (reg:QI 1 r1)
> (subreg:QI (mem/j/c:DI (plus:SI (reg/v/f:SI 2 r2 [orig:199 pr_reg ] [199])
> (const_int 576 [0x240])) [0 pr_reg_50->pr_res_key+0 S8 A32]) 7)) drivers/target/target_core_pr.c:3677 -1
> (nil))
> drivers/target/target_core_pr.c:4033:1: internal compiler error: in extract_insn, at recog.c:2151
> 0x758fb5 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*)
> ../../gcc/gcc/rtl-error.c:109
> 0x758fe9 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
> ../../gcc/gcc/rtl-error.c:117
> 0x726e83 extract_insn(rtx_def*)
> ../../gcc/gcc/recog.c:2151
> 0x726ef4 extract_insn_cached(rtx_def*)
> ../../gcc/gcc/recog.c:2054
> 0x5fe026 cleanup_subreg_operands(rtx_def*)
> ../../gcc/gcc/final.c:3305
> 0x750c2e reload(rtx_def*, int)
> ../../gcc/gcc/reload1.c:1240
> 0x68e703 do_reload
> ../../gcc/gcc/ira.c:4631
> 0x68e703 rest_of_handle_reload
> ../../gcc/gcc/ira.c:4731
> Please submit a full bug report,
> with preprocessed source if appropriate.
> Please include the complete backtrace with any bug report.
> See <http://gcc.gnu.org/bugs.html> for instructions.
> make[2]: *** [drivers/target/target_core_pr.o] Error 1
> make[1]: *** [drivers/target] Error 2
> make: *** [drivers] Error 2

Can these issues be reproduced with the lastest gcc version? If so,
can you provide preprocessed source of the testcases and the compiler
flags to trigger the ICEs?
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