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[Bug optimization/12576] New: [3.3 regression] miscompilation of ide-scsi kernel driver


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12576

           Summary: [3.3 regression] miscompilation of ide-scsi kernel
                    driver
           Product: gcc
           Version: 3.3.2
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: debian-gcc at lists dot debian dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i486-linux
  GCC host triplet: i486-linux
GCC target triplet: i486-linux

[forwarded from http://bugs.debian.org/211783]

gcc 3.3.2 20031005 (and 20030908) break ide-scsi during boot or modprobe of
ide-scsi as seen in message below. The miscompilation is seen with -O2, but not
with -Os. The ide-scsi module is built in the kernel, not built as a module.

Sep 20 17:54:35 art kernel: SCSI subsystem driver Revision: 1.00
Sep 20 17:54:35 art kernel: hdc: attached ide-scsi driver.
Sep 20 17:54:35 art kernel: scsi0 : SCSI host adapter emulation for IDE ATAPI de
vices
Sep 20 17:54:35 art kernel:   Vendor:           Model:                   Rev:

Sep 20 17:54:35 art kernel:   Type:   Direct-Access                      ANSI SC
SI revision: 03
***************************


gcc 3.3 20030831 does not have this problem as in the message below:

Sep 20 17:00:59 art kernel: SCSI subsystem driver Revision: 1.00
Sep 20 17:00:59 art kernel: hdc: attached ide-scsi driver.
Sep 20 17:00:59 art kernel: scsi0 : SCSI host adapter emulation for IDE ATAPI de
vices
Sep 20 17:00:59 art kernel:   Vendor: HP        Model: CD-Writer+ 8100   Rev: 1.
0g
Sep 20 17:00:59 art kernel:   Type:   CD-ROM                             ANSI SC
SI revision: 02


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