Re: data-tests-logcount Failure

[Paul Eggert <eggert@cs.ucla.edu>]

On 10/24/2017 03:07 AM, Colin Baxter wrote:
> FAILED data-tests-logcount
What are the values of (logcount 9727) and (logcount 9999) on your 
platform? They should be 11 and 8, respectively.Are there more details 
about this in the file test/src/data-tests.log?

How did you invoke 'configure'? What is the output of 'gcc --version', 
and of 'cat /proc/cpuinfo'?

Can you run Emacs under GDB and put a breakpoint on the Flogcount 
function, and execute the above two Elisp calls while single-stepping 
through Flogcount, and also disassemble Flogcount? I did that on Fedora 
26 x86-64 on AMD Phenom II X4 910e, configured with 
'PKG_CONFIG_LIBDIR=/usr/lib/pkgconfig:/usr/share/pkgconfig ./configure 
CC="/usr/bin/gcc -m32 -march=native -fsanitize=undefined 
-static-libubsan" --enable-gcc-warnings --without-imagemagick 
--with-modules', and got the following. What do you get when you try the 
same thing with your configuration?

     $ gdb bootstrap-emacs
     (gdb) source .gdbinit
     (gdb) b Flogcount
     (gdb) r -Q
     [In the *scratch* buffer, type "(logcount 9727) C-j".]
     Breakpoint 3, Flogcount (value=make_number(9727)) at data.c:3078
     (gdb) bt
     #0  Flogcount (value=make_number(9727)) at data.c:3078
     ...
     (gdb) disas
     Dump of assembler code for function Flogcount:
     => 0x08184080 <+0>:    sub    $0xc,%esp
        0x08184083 <+3>:    mov    0x14(%esp),%edx
        0x08184087 <+7>:    mov    0x10(%esp),%eax
        0x0818408b <+11>:    mov    %edx,%ecx
        0x0818408d <+13>:    and    $0x3,%ecx
        0x08184090 <+16>:    cmp    $0x2,%ecx
        0x08184093 <+19>:    jne    0x81840b2 <Flogcount+50>
        0x08184095 <+21>:    mov    %edx,%ecx
        0x08184097 <+23>:    sar    $0x1f,%edx
        0x0818409a <+26>:    sar    $0x2,%ecx
        0x0818409d <+29>:    xor    %edx,%ecx
        0x0818409f <+31>:    popcnt %ecx,%ecx
        0x081840a3 <+35>:    lea    0x2(,%ecx,4),%edx
        0x081840aa <+42>:    mov    %edx,(%eax)
        0x081840ac <+44>:    add    $0xc,%esp
        0x081840af <+47>:    ret    $0x4
        0x081840b2 <+50>:    push   %eax
        0x081840b3 <+51>:    push   %eax
        0x081840b4 <+52>:    push   %edx
        0x081840b5 <+53>:    push   $0x3b40
        0x081840ba <+58>:    call   0x8183020 <wrong_type_argument>
     End of assembler dump.
     (gdb) fin
     Run till exit from #0  Flogcount (value=make_number(9727)) at 
data.c:3078
     0x0819ceaf in eval_sub (form=...) at eval.c:2234
     Value returned is $1 = make_number(11)
     (gdb) cont
     Continuing.
     [In the *scratch* buffer, type "(logcount 9999) C-j".]

     Breakpoint 3, Flogcount (value=make_number(9999)) at data.c:3078
     (gdb) fin
     Run till exit from #0  Flogcount (value=make_number(9999)) at 
data.c:3078
     0x0819ceaf in eval_sub (form=...) at eval.c:2234
     Value returned is $2 = make_number(8)


My /proc/cpuinfo looks like this, repeated once for each core:

     processor    : 0
     vendor_id    : AuthenticAMD
     cpu family    : 16
     model        : 4
     model name    : AMD Phenom(tm) II X4 910e Processor
     stepping    : 3
     microcode    : 0x10000c8
     cpu MHz        : 2608.807
     cache size    : 512 KB
     physical id    : 0
     siblings    : 4
     core id        : 0
     cpu cores    : 4
     apicid        : 0
     initial apicid    : 0
     fpu        : yes
     fpu_exception    : yes
     cpuid level    : 5
     wp        : yes
     flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge 
mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext 
fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl 
nonstop_tsc cpuid extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy 
svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs 
skinit wdt hw_pstate vmmcall npt lbrv svm_lock nrip_save
     bugs        : tlb_mmatch apic_c1e fxsave_leak sysret_ss_attrs 
null_seg amd_e400
     bogomips    : 5217.61
     TLB size    : 1024 4K pages
     clflush size    : 64
     cache_alignment    : 64
     address sizes    : 48 bits physical, 48 bits virtual
     power management: ts ttp tm stc 100mhzsteps hwpstate