Re: x86 PIC regressions

[Robert Lipe <robertl at dgii dot com>]

H.J. Lu wrote:
> > 
> > Sometime in the last few days in the trunk, x86 has regressed on
> > PIC testcases.  Since few exercise this, I suspect it hasn't been
> > noticed in the common 'make check' cases.  I've verified this on both
> > i686-linux-gnu and i686-pc-sco3.2v5.0.4.  I updated the tree about
> > noonish CDT on 8/27.
> > 
> > While this failure case is only one of several, one quick way to 
> > watch it break is:
> > 
> >    make check-gcc RUNTESTFLAGS="--tool_opts -fPIC execute.exp=930106-1.c"
> > 
> 
> This is what I got for egcs 1.1 prerelease on i586-linux-gnu. However,
> I have quite a few patches installed. One of them is
> 
> Fri Aug 28 05:06:06 1998  Bernd Schmidt <crux@pool.informatik.rwth-aachen.de>
> 
>         * config/gcc/i386.md (movsf, movdf, movxf): Accept no constants
>         if -fPIC and -fomit-frame-pointer.


This must not be the one.  I just applied that patch to my tree on
my i686-pc-linux-gnu, rebuilt it, and reran the above command.  The
compiler still hari-karis:

Executing on host: /home/robertl/tmp/negcs/gcc/xgcc -B/home/robertl/tmp/negcs/gc
c/ /play/egcs/gcc/testsuite/gcc.c-torture/execute/930106-1.c  -w  -O0  -fPIC  -l
m   -o /home/robertl/tmp/negcs/gcc/testsuite/930106-1.x0
compiler exited with status 1
output is:
/play/egcs/gcc/testsuite/gcc.c-torture/execute/930106-1.c: In function `main':
/play/egcs/gcc/testsuite/gcc.c-torture/execute/930106-1.c:27: internal error--un
recognizable insn:
(insn 12 11 13 (set:DF (reg:DF 23)
        (mem/u:DF (symbol_ref/u:SI ("*.LC0")))) -1 (nil)
    (expr_list:REG_EQUAL (const_double:DF (mem/u:DF (symbol_ref/u:SI ("*.LC0")))
 0 0 1073790976)
        (nil)))
/play/egcs/gcc/toplev.c:1360: Internal compiler error in function fatal_insn

FAIL: gcc.c-torture/execute/930106-1.c compilation,  -O0




Were the failures you cite below from a straight make check, or did you
add the -fPIC stuff as described above?



> FAIL: gcc.c-torture/execute/980506-2.c execution,  -O2 
> FAIL: gcc.c-torture/execute/980506-2.c execution,  -O2 -g 
> FAIL: gcc.c-torture/execute/980506-2.c execution,  -Os 
> FAIL: gcc.c-torture/execute/980526-1.c execution,  -O2 -fomit-frame-pointer -finline-functions 
> FAIL: gcc.c-torture/execute/ieee/980619-1.c execution,  -O1 
> FAIL: gcc.c-torture/execute/ieee/980619-1.c execution,  -O2 
> FAIL: gcc.c-torture/execute/ieee/980619-1.c execution,  -O2 -fomit-frame-pointer -finline-functions 
> FAIL: gcc.c-torture/execute/ieee/980619-1.c execution,  -O2 -fomit-frame-pointer -finline-functions -funroll-loops 
> FAIL: gcc.c-torture/execute/ieee/980619-1.c execution,  -O2 -fomit-frame-pointer -finline-functions -funroll-all-loops 
> FAIL: gcc.c-torture/execute/ieee/980619-1.c execution,  -O2 -g 
> FAIL: gcc.c-torture/execute/ieee/980619-1.c execution,  -Os 
> FAIL: gcc.dg/980626-1.c (test for excess errors)
> FAIL: gcc.dg/clobbers.c execution test