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* [Bug c/49119] New: PowerPC: Wrong code with designated initializers and bit fields
@ 2011-05-23  8:29 sebastian.huber@embedded-brains.de
  2011-05-23  8:23 ` [Bug c/49119] " sebastian.huber@embedded-brains.de
                   ` (6 more replies)
  0 siblings, 7 replies; 8+ messages in thread
From: sebastian.huber@embedded-brains.de @ 2011-05-23  8:29 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49119

           Summary: PowerPC: Wrong code with designated initializers and
                    bit fields
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: sebastian.huber@embedded-brains.de
            Target: powerpc-rtems4.11-gcc


With GCC 4.6.1 20110513 for PowerPC with -O2 I get this:

Disassembly of section .text:

00000000 <wrong_code>:
   0:   38 00 00 00     li      r0,0   <- This is wrong
   4:   7c 10 9b a6     mtspr   624,r0 <-
   8:   3d 20 00 00     lis     r9,0
   c:   80 09 00 04     lwz     r0,4(r9)
  10:   7c 11 9b a6     mtspr   625,r0
  14:   3d 20 00 00     lis     r9,0
  18:   80 09 00 08     lwz     r0,8(r9)
  1c:   7c 12 9b a6     mtspr   626,r0
  20:   3d 20 00 00     lis     r9,0
  24:   80 09 00 0c     lwz     r0,12(r9)
  28:   7c 13 9b a6     mtspr   627,r0
  2c:   7c 00 07 a4     tlbld   r0
  30:   4e 80 00 20     blr

00000034 <valid_code>:
  34:   3c 00 10 05     lis     r0,4101 <- This is valid
  38:   7c 10 9b a6     mtspr   624,r0  <-
  3c:   3d 20 00 00     lis     r9,0
  40:   80 09 00 1c     lwz     r0,28(r9)
  44:   7c 11 9b a6     mtspr   625,r0
  48:   3d 20 00 00     lis     r9,0
  4c:   80 09 00 20     lwz     r0,32(r9)
  50:   7c 12 9b a6     mtspr   626,r0
  54:   3d 20 00 00     lis     r9,0
  58:   80 09 00 24     lwz     r0,36(r9)
  5c:   7c 13 9b a6     mtspr   627,r0
  60:   7c 00 07 a4     tlbld   r0
  64:   4e 80 00 20     blr

Disassembly of section .rodata:

00000000 <mmu_setup_wrong>:
   0:   10 05 00 00
   4:   c0 00 01 00
   8:   3f ff 80 0a
   c:   3f ff 80 0f
        ...

00000018 <mmu_setup_valid>:
  18:   10 05 00 00
  1c:   c0 00 01 00
  20:   3f ff 80 0a
  24:   3f ff 80 0f

The designated initializer
  .MAS0 = { .B = { .TLBSEL = 1, .ESEL = 5 } },
leads to wrong code.  On the other hand
  .MAS0 = { .R = 0x10050000 },
leads to valid code.


^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2011-08-24 10:34 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-05-23  8:29 [Bug c/49119] New: PowerPC: Wrong code with designated initializers and bit fields sebastian.huber@embedded-brains.de
2011-05-23  8:23 ` [Bug c/49119] " sebastian.huber@embedded-brains.de
2011-08-22 13:23 ` sebastian.huber@embedded-brains.de
2011-08-22 16:44 ` mikpe at it dot uu.se
2011-08-23 15:27 ` sebastian.huber@embedded-brains.de
2011-08-24  8:30 ` sebastian.huber@embedded-brains.de
2011-08-24 10:34 ` mikpe at it dot uu.se
2011-08-24 10:36 ` sebastian.huber@embedded-brains.de

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