optimization/697: 2.96 20000731 (Red Hat Linux 7.0) generates bad linked list code on -O2, working code on -O1 or -g

[Mike at arl dot army dot mil]

>Number:         697
>Category:       optimization
>Synopsis:       2.96 20000731 (Red Hat Linux 7.0) generates bad linked list code on -O2, working code on -O1 or -g
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 26 21:06:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Mike Muuss <Mike@arl.army.mil>
>Release:        gcc version 2.96 20000731 (Red Hat Linux 7.0)
>Organization:
>Environment:

>Description:
This dumps
rm s2; gcc -O2 ../rt/s2.c -o s2; ./s2
This does not dump:
rm s2; gcc -O1 ../rt/s2.c -o s2; ./s2

The problem appears to be that the optimizer incorrectly
re-orders a pointer load in the middle of a linked-list
routine, resulting in a damaged linked list.
>How-To-Repeat:
rm s2 ; gcc -O2 -v -save-temps ../rt/s2.c -o s2 ; ./s2

Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.0)
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/cpp0 -lang-c -v -D__GNUC__=2 -D__GNUC_MINOR__=96 -D__GNUC_PATCHLEVEL__=0 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem(posix) -D__OPTIMIZE__ -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -D__tune_i386__ ../rt/s2.c s2.i
GNU CPP version 2.96 20000731 (Red Hat Linux 7.0) (cpplib)
 (i386 Linux/ELF)
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/i386-redhat-linux/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/include
 /usr/include
End of search list.
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/cc1 s2.i -quiet -dumpbase s2.c -O2 -version -o s2.s
GNU C version 2.96 20000731 (Red Hat Linux 7.0) (i386-redhat-linux) compiled by GNU C version 2.96 20000731 (Red Hat Linux 7.0).
 as -V -Qy -o s2.o s2.s
GNU assembler version 2.10.90 (i386-redhat-linux) using BFD version 2.10.0.18
 /usr/lib/gcc-lib/i386-redhat-linux/2.96/collect2 -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -o s2 /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crt1.o /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crti.o /usr/lib/gcc-lib/i386-redhat-linux/2.96/crtbegin.o -L/usr/lib/gcc-lib/i386-redhat-linux/2.96 -L/usr/lib/gcc-lib/i386-redhat-linux/2.96/../../.. s2.o -lgcc -lc -lgcc /usr/lib/gcc-lib/i386-redhat-linux/2.96/crtend.o /usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crtn.o

bu_ck_list_magic(re_parthead) cur=x8049ba8, cur->back=x8049ba8, cur->back->forw=x8049bb4, hd=x8049ba8, item=0
Abort (core dumped)
>Fix:
Unknown
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="s2.i"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="s2.i"

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