[Bug ipa/65006] [5 Regression] 252.eon in SPEC CPU 2000 miscompiled with LTO

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65006

--- Comment #12 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to H.J. Lu from comment #11)
> r220521 miscompiled 252.eon in SPEC CPU 2000 with LTO for both x86-32:
> 
> https://gcc.gnu.org/ml/gcc-testresults/2015-02/msg01063.html
> 
> and x32:
> 
> https://gcc.gnu.org/ml/gcc-testresults/2015-02/msg01047.html
> 
> X86-32 was fixed:
> 
> https://gcc.gnu.org/ml/gcc-testresults/2015-02/msg01417.html
> 
> But not:
> 
> https://gcc.gnu.org/ml/gcc-testresults/2015-02/msg01406.html
> 
> I got
> 
> [hjl@gnu-mic-2 00000002]$ ../00000002/eon_peak.lto chair.control.cook
> chair.camera chair.surfaces chair.cook.ppm ppm pixels_out.cook
> Segmentation fault
> [hjl@gnu-mic-2 00000002]$ gdb ../00000002/eon_peak.lto
> GNU gdb (GDB) Fedora 7.7.1-21.fc20
> Copyright (C) 2014 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-redhat-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/>.
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from ../00000002/eon_peak.lto...done.
> (gdb) r chair.control.cook chair.camera chair.surfaces chair.cook.ppm ppm
> pixels_out.cook
> Starting program:
> /export/project/git/gcc-regression/spec/2000/spec/benchspec/CINT2000/252.eon/
> run/00000002/eon_peak.lto chair.control.cook chair.camera chair.surfaces
> chair.cook.ppm ppm pixels_out.cook
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x0042078c in operator*(ggSpectrum const&, ggSpectrum const&) ()
> Missing separate debuginfos, use: debuginfo-install glibc-2.18-16.0.fc20.x32
> libgcc-4.8.3-7.2.fc20.x86_64 libstdc++-4.8.3-7.2.fc20.x86_64
> (gdb) bt
> #0  0x0042078c in operator*(ggSpectrum const&, ggSpectrum const&) ()
> #1  0x004452d4 in eonImageCalculator::eonImageCalculator() ()
> #2  0x0040378a in main ()
> (gdb) f 0
> #0  0x0042078c in operator*(ggSpectrum const&, ggSpectrum const&) ()
> (gdb) disass
> Dump of assembler code for function _ZmlRK10ggSpectrumS1_:
>    0x00420780 <+0>:	movups (%esi),%xmm0
>    0x00420784 <+4>:	mov    %rdi,%rax
>    0x00420787 <+7>:	movups 0x10(%esi),%xmm1
> => 0x0042078c <+12>:	mulps  (%edx),%xmm0
>    0x00420790 <+16>:	mulps  0x10(%edx),%xmm1
>    0x00420795 <+21>:	movups %xmm0,(%edi)
>    0x00420799 <+25>:	movups %xmm1,0x10(%edi)
>    0x0042079e <+30>:	retq   
> End of assembler dump.
> (gdb) p $edx
> $1 = -13304
> (gdb) p/x $edx
> $2 = 0xffffcc08

Adding -fno-ipa-cp fixes x32.  Fix for PR 65028 isn't complete.
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/65028] [5 Regression] 450.soplex in SPEC CPU 2006 is miscompiled
Date: Mon, 16 Feb 2015 17:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide028

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
The same bug affects 252.eon in SPEC CPU 2000 on x32:

[hjl@gnu-mic-2 00000002]$ ../00000002/eon_peak.lto chair.control.cook
chair.camera chair.surfaces chair.cook.ppm ppm pixels_out.cook
Segmentation fault
[hjl@gnu-mic-2 00000002]$ gdb ../00000002/eon_peak.lto
GNU gdb (GDB) Fedora 7.7.1-21.fc20
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ../00000002/eon_peak.lto...done.
(gdb) r chair.control.cook chair.camera chair.surfaces chair.cook.ppm ppm
pixels_out.cook
Starting program:
/export/project/git/gcc-regression/spec/2000/spec/benchspec/CINT2000/252.eon/run/00000002/eon_peak.lto
chair.control.cook chair.camera chair.surfaces chair.cook.ppm ppm
pixels_out.cook

Program received signal SIGSEGV, Segmentation fault.
0x0042078c in operator*(ggSpectrum const&, ggSpectrum const&) ()
Missing separate debuginfos, use: debuginfo-install glibc-2.18-16.0.fc20.x32
libgcc-4.8.3-7.2.fc20.x86_64 libstdc++-4.8.3-7.2.fc20.x86_64
(gdb) bt
#0  0x0042078c in operator*(ggSpectrum const&, ggSpectrum const&) ()
#1  0x004452d4 in eonImageCalculator::eonImageCalculator() ()
#2  0x0040378a in main ()
(gdb) f 0
#0  0x0042078c in operator*(ggSpectrum const&, ggSpectrum const&) ()
(gdb) disass
Dump of assembler code for function _ZmlRK10ggSpectrumS1_:
   0x00420780 <+0>:    movups (%esi),%xmm0
   0x00420784 <+4>:    mov    %rdi,%rax
   0x00420787 <+7>:    movups 0x10(%esi),%xmm1
=> 0x0042078c <+12>:    mulps  (%edx),%xmm0
   0x00420790 <+16>:    mulps  0x10(%edx),%xmm1
   0x00420795 <+21>:    movups %xmm0,(%edi)
   0x00420799 <+25>:    movups %xmm1,0x10(%edi)
   0x0042079e <+30>:    retq
End of assembler dump.
(gdb) p $edx
$1 = -13304
(gdb) p/x $edx
$2 = 0xffffcc08

The fix isn't sufficient since adding -fno-ipa-cp fixes eon on x32.