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* [Bug debug/100469] New: [11/12 Regression] -fcompare-debug failure (length) with -O2 -fno-tree-dse -fno-tree-forwprop -fno-tree-tail-merge --param=sccvn-max-alias-queries-per-access=0
@ 2021-05-07 10:52 zsojka at seznam dot cz
  2021-05-07 10:57 ` [Bug debug/100469] " jakub at gcc dot gnu.org
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: zsojka at seznam dot cz @ 2021-05-07 10:52 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100469

            Bug ID: 100469
           Summary: [11/12 Regression] -fcompare-debug failure (length)
                    with -O2 -fno-tree-dse -fno-tree-forwprop
                    -fno-tree-tail-merge
                    --param=sccvn-max-alias-queries-per-access=0
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
                CC: aoliva at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu

Created attachment 50773
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50773&action=edit
auto-reduced testcase (from OpenTTD sources)

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -fno-tree-dse -fno-tree-forwprop
-fno-tree-tail-merge --param=sccvn-max-alias-queries-per-access=0
-fcompare-debug testcase.C -save-temps
x86_64-pc-linux-gnu-gcc: error: testcase.C: '-fcompare-debug' failure (length)

$ diff a-testcase.C.gkd a-testcase.gk.C.gkd
13a14,15
> (note # 0 0 NOTE_INSN_DELETED)
> (note # 0 0 NOTE_INSN_DELETED)
15,16c17,18
<         (mem:DI (reg:DI 4 si [89]) [ MEM[(const struct S &)s_2(D)].m+0 S8
A64])) "testcase.C":6:11# {*movdi_internal}
<      (expr_list:REG_DEAD (reg:DI 4 si [89])
---
>         (mem:DI (reg:DI 4 si [90]) [ MEM[(const struct S &)s_2(D)].m+0 S8 A64])) "testcase.C":6:11# {*movdi_internal}
>      (expr_list:REG_DEAD (reg:DI 4 si [90])
19c21
<             (set (reg:DI 2 cx [90])
---
>             (set (reg:DI 2 cx [91])
26c28
<         (reg:DI 5 di [88])) "testcase.C":26:1# {*movdi_internal}
---
>         (reg:DI 5 di [89])) "testcase.C":26:1# {*movdi_internal}
36c38
<             (reg:DI 2 cx [90]))) "testcase.C":21:32# {*movdicc_noc}
---
>             (reg:DI 2 cx [91]))) "testcase.C":21:32# {*movdicc_noc}
38c40
<         (expr_list:REG_DEAD (reg:DI 2 cx [90])
---
>         (expr_list:REG_DEAD (reg:DI 2 cx [91])

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-581-20210507001633-gcfe82a0cbe7-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-cloog --with-ppl --with-isl --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu
--with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r12-581-20210507001633-gcfe82a0cbe7-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20210507 (experimental) (GCC)

^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-11-15 13:51 UTC | newest]

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-- links below jump to the message on this page --
2021-05-07 10:52 [Bug debug/100469] New: [11/12 Regression] -fcompare-debug failure (length) with -O2 -fno-tree-dse -fno-tree-forwprop -fno-tree-tail-merge --param=sccvn-max-alias-queries-per-access=0 zsojka at seznam dot cz
2021-05-07 10:57 ` [Bug debug/100469] " jakub at gcc dot gnu.org
2021-07-28  7:06 ` rguenth at gcc dot gnu.org
2021-11-15 13:49 ` cvs-commit at gcc dot gnu.org
2021-11-15 13:51 ` jakub at gcc dot gnu.org

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