Re: egcs-19980803 (pre-1.1) solaris regressions

[Jeffrey A Law <law at cygnus dot com>]

  In message <199808181205.FAA23454@dm.cobaltmicro.com>you write:
  >    Date: Fri, 7 Aug 1998 16:28:45 -0400 (EDT)
  >    From: "Kaveh R. Ghazi" <ghazi@caip.rutgers.edu>
  > 
  > Hi Kaveh,
  > 
  > 	   The following errors (except for 930628-1) are regressions
  >    from prior releases/snapshots, but they don't appear in "make check"
  >    because the testsuite doesn't run with -fpic/-fPIC.
  > 
  >    ERROR: 930628-1.c: compiled program got signal 11: -O -fno-omit-frame-po
  > inter -fpic
  >    ERROR: 930628-1.c: compiled program got signal 11: -O -fomit-frame-point
  > er -fpic
  > 
  > Interesting, as I have begun to look into these tonight.  The cause of
  > all these errors is the same thing, and it is related to another
  > recent thread on here from which I will quote the following:
  > 
[ ... ]
  > No Jeff, that is incorrect, it is a _serious_ problem.  Something bad
  > does in fact happen if the basic blocks get spilled over like this.
  > 
  > For one, and this is the failure mode we are seeing on Sparc with
  > Kaveh's PIC test case failures, reorg can't figure out the correct
  > basic block to re-record liveness information when filling delay
  > slots, and as a result the lifetime info becomes corrupt and thus will
  > cause reorg to clobber registers illegally.  For example, in one of
  > the Sparc PIC testcases mentioned above reorg changes:
This is a bug in reorg.  I belive it is supposed to handle these kinds
of inconsistencies in the rtl and basic_block_* data structures.

jeff