Re: [Qemu-devel] [PATCH 18/25] tcg/aarch64: Handle ctz and clz opcodes

["Alex Bennée" <alex.bennee@linaro.org>]

Richard Henderson <rth@twiddle.net> writes:

> On 11/16/2016 08:25 PM, Richard Henderson wrote:
>> @@ -206,6 +206,9 @@ static int tcg_target_const_match(tcg_target_long val, TCGType type,
>>      if ((ct & TCG_CT_CONST_MONE) && val == -1) {
>>          return 1;
>>      }
>> +    if ((ct & TCG_CT_CONST_WSZ) && val == (type ? 64 : 32)) {
>> +        return 1;
>> +    }
>>
>>      return 0;
>>  }
>
> Bah.  Forgot to revert this hunk at the last minute.
>
>
> r~

I'm also seeing asserts fire as it decodes risu tests:

IN:
0x0000004000801148:  b37ad6fc      bfi x28, x23, #6, #54
0x000000400080114c:  00005af0      unallocated (Unallocated)

qemu-aarch64: /home/alex/qemu.git/tcg/tcg-op.c:1937: tcg_gen_deposit_i64: Assertion `ofs + len <= 64' failed.

Thread 1 "qemu-aarch64" received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
58      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58
#1  0x0000007fb7ac5df4 in __GI_abort () at abort.c:89
#2  0x0000007fb7abe22c in __assert_fail_base (fmt=0x7fb7bad9f0 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x5555747068 "ofs + len <= 64", file=file@entry=0x5555746ec8 "/home/alex/qemu.git/tcg/tcg-op.c", line=line@entry=1937, function=function@entry=0x55557472f0 <__PRETTY_FUNCTION__.46784> "tcg_gen_deposit_i64") at assert.c:92
#3  0x0000007fb7abe2c4 in __GI___assert_fail (assertion=0x5555747068 "ofs + len <= 64", file=0x5555746ec8 "/home/alex/qemu.git/tcg/tcg-op.c", line=1937, function=0x55557472f0 <__PRETTY_FUNCTION__.46784> "tcg_gen_deposit_i64") at assert.c:101
#4  0x00000055555ce1e4 in tcg_gen_deposit_i64 (ret=0x1f, arg1=0x1f, arg2=0x3c, ofs=23, len=48) at /home/alex/qemu.git/tcg/tcg-op.c:1937
#5  0x0000005555694a7c in disas_bitfield (s=0x7fffffea08, insn=3010051815) at /home/alex/qemu.git/target-arm/translate-a64.c:3249
#6  0x0000005555694dec in disas_data_proc_imm (s=0x7fffffea08, insn=3010051815) at /home/alex/qemu.git/target-arm/translate-a64.c:3341
#7  0x00000055556a5d30 in disas_a64_insn (env=0x555783ca18, s=0x7fffffea08) at /home/alex/qemu.git/target-arm/translate-a64.c:11154
#8  0x00000055556a624c in gen_intermediate_code_a64 (cpu=0x5557834720, tb=0x7fb5822e50) at /home/alex/qemu.git/target-arm/translate-a64.c:11312
#9  0x0000005555651be0 in gen_intermediate_code (env=0x555783ca18, tb=0x7fb5822e50) at /home/alex/qemu.git/target-arm/translate.c:11588
#10 0x00000055555b8324 in tb_gen_code (cpu=0x5557834720, pc=274886299984, cs_base=0, flags=2147483648, cflags=0) at /home/alex/qemu.git/translate-all.c:1311
#11 0x00000055555bafe8 in tb_find (cpu=0x5557834720, last_tb=0x0, tb_exit=0) at /home/alex/qemu.git/cpu-exec.c:346
#12 0x00000055555bb72c in cpu_exec (cpu=0x5557834720) at /home/alex/qemu.git/cpu-exec.c:637
#13 0x00000055555f1410 in cpu_loop (env=0x555783ca18) at /home/alex/qemu.git/linux-user/main.c:788
#14 0x00000055555f2f74 in main (argc=7, argv=0x7ffffff6b8, envp=0x7ffffff6f8) at /home/alex/qemu.git/linux-user/main.c:4557
(gdb)

Annoyingly in_asm only dumps after a decode but I believe the
instruction is:

  0xb369bee7

    14c:       00005af0        .inst   0x00005af0 ; undefined
    150:       b369bee7        bfxil   x7, x23, #41, #7
    154:       00005af0        .inst   0x00005af0 ; undefined

--
Alex Bennée