Deadly optimization bug (all gcc versions!)

[Jerry Quinn]

>> "David" == David Edelsohn <dje@watson.ibm.com> writes:

 >>>>>> veksler writes:
 veksler> The bug shows itself on gcc-2.7.0 gcc-2.7.2.1, egcs-1.0.1,
 veksler> egcs-1.1.2, gcc-2.95.  On AIX-4.1, Linux-x86 (RH4.2 and RH6.0).

 David> 	This means that you have seen the bug in both PowerPC and
 David> IA-32 code generation?  I definitely see it in PowerPC.  A whole group
 David> of instructions disappear between flow and combine.  Also, -O3 with
 David> inlining seems to produce correct results.  Maybe combine is trying
 David> some alternate instructions, failing, and then not properly restoring
 David> the instructions?

I just tried this on HPUX 10.20 and get the same behavior.  -O gets 0,0,0 and
no flags, -g, and -O3 -finline all get 0,1,1

-- 
Jerry Quinn                             Tel: (514) 761-8737
jquinn@nortelnetworks.com               Fax: (514) 761-8505
Speech Recognition Research