[Bug 786230] Re: O1 wrong-code by cmove

[teawater]

gcc -Wp,-MD,drivers/staging/wlan-ng/.p80211wep.o.d  -nostdinc -isystem /usr/lib/gcc/i686-linux-gnu/4.6.0/include -I/home/teawater/kernel/linux-2.6/arch/x86/include -Iarch/x86/include/generated -Iinclude  -I/home/teawater/kernel/linux-2.6/include -include include/generated/autoconf.h  -I/home/teawater/kernel/linux-2.6/drivers/staging/wlan-ng -Idrivers/staging/wlan-ng -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -O2 -m32 -msoft-float -mregparm=3 -freg-struct-return -mpreferred-stack-boundary=2 -march=i686 -mtune=core2 -mtune=generic -maccumulate-outgoing-args -Wa,-mtune=generic32 -ffreestanding -fstack-protector -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -Wframe-larger-than=1024 -Wno-unused-but-set-variable -fno-omit-frame-pointer -fno-optimize-sibling-calls -g -pg -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fconserve-stack -DCC_HAVE_ASM_GOTO  -DMODULE  -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(p80211wep)"  -D"KBUILD_MODNAME=KBUILD_STR(prism2_usb)" -c -o drivers/staging/wlan-ng/.tmp_p80211wep.o /home/teawater/kernel/linux-2.6/drivers/staging/wlan-ng/p80211wep.c
/home/teawater/kernel/linux-2.6/drivers/staging/wlan-ng/p80211wep.c: In function 'wep_decrypt':
/home/teawater/kernel/linux-2.6/drivers/staging/wlan-ng/p80211wep.c:229:1: internal compiler error: in form_sum, at reload.c:5331
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.
make[3]: *** [drivers/staging/wlan-ng/p80211wep.o] Error 1
make[2]: *** [drivers/staging/wlan-ng/p80211wep.o] Error 2
make[1]: *** [sub-make] Error 2
make: *** [all] Error 2

I am not sure you can very easy reproduce this issue without all kernel
source.

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https://bugs.launchpad.net/bugs/786230

Title:
  O1 wrong-code by cmove

Status in “gcc-4.5” package in Ubuntu:
  Fix Released
Status in “gcc-4.5” source package in Maverick:
  Confirmed
Status in “gcc-4.5” source package in Natty:
  Fix Released
Status in “gcc-4.5” source package in Oneiric:
  Fix Released

Bug description:
  Binary package hint: gcc-4.5

  gdb: gdb forgot how to do arithmetic
  https://bugzilla.redhat.com/show_bug.cgi?id=635508
  ->
  gcc: -O1 wrong-code by cmove
  https://bugzilla.redhat.com/show_bug.cgi?id=634757
  ->
  gcc: [4.5/4.6 Regression] -O1 wrong-code by cmove
  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45695

  I reproduce this issue in gcc version 4.5.1 (Ubuntu/Linaro
  4.5.1-7ubuntu2)