egcs-971105 powerpc-ibm-aix4.1.4.0 new regression compile/920501-4.c

[Kaveh R. Ghazi]

	The following error still occurs in egcs-971114 and is one
case where egcs does worse than the most recent gcc snapshot.

		--Kaveh

 > 	I got a c-torture regression in egcs-971105 on powerpc-ibm-aix4.1.4.0.
 > 
 > I successfully bootstrapped a clean snapshot using BOOT_CFLAGS='-g -O3
 > -mminimal-toc' and also a clean snapshot plus Jim's unroll patch at
 > BOOT_CFLAGS='-g -O3 -funroll-all-loops -mminimal-toc -pipe'.
 > 
 > 	Both bootstrapps have these new c-torture problems:
 > 
 > ERROR: 920501-4.c: compiler got signal 6: -O2 -fomit-frame-pointer
 > ERROR: 920501-4.c: compiler got signal 6: -O3 -fomit-frame-pointer
 > ERROR: 920501-4.c: compiler got signal 6: -O3 -funroll-all-loops
 > 
 > 	Below is some more info about the failure.
 > 
 > 		--Kaveh
 > 
 > ---------------------------------------------------------------------------
 > 
 > 	This is what gets output when compiled by hand with -O2
 > -fomit-frame-pointer:
 > 
 > compile/920501-4.c: In function `foo':
 > compile/920501-4.c:49: Could not find a spill register
 > (insn:QI 657 668 771 (parallel[
 >             (set (mem:SI (plus:SI (reg:SI 1 r1)
 >                         (const_int 32808)))
 >                 (lshiftrt:SI (neg:SI (abs:SI (reg/v:SI 66 ctr)))
 >                     (const_int 31)))
 >             (clobber (scratch:SI))
 >         ] ) 540 {sleu+25} (nil)
 >     (expr_list:REG_UNUSED (scratch:SI)
 >         (nil)))
 > 
 > IOT/Abort trap in raise at 0xd0078900
 > 
 > 
 > ---------------------------------------------------------------------------
 > 
 > 	Here is the backtrace from cc1 using dbx:
 > 
 > 
 > raise(??) at 0xd0078900
 > abort() at 0xd0019a14
 > fatal_insn(message = (nil), insn = internal error: assertion failed at line 947
 > 0xd0078900), line 1135 in "toplev.c"
 > allocate_reload_reg(??, ??, ??, ??), line 5196 in "reload1.c"
 > unnamed block $b6424, line 5746 in "reload1.c"
 > choose_reload_regs(??, ??), line 5746 in "reload1.c"
 > unnamed block $b6384, line 4127 in "reload1.c"
 > unnamed block $b6382, line 4127 in "reload1.c"
 > unnamed block $b6381, line 4127 in "reload1.c"
 > reload_as_needed(??, ??), line 4127 in "reload1.c"
 > reload1.reload(??, ??, ??), line 2081 in "reload1.c"
 > global_alloc(??), line 584 in "global.c"
 > unnamed block $b1372, line 3521 in "toplev.c"
 > unnamed block $b1371, line 3521 in "toplev.c"
 > rest_of_compilation(decl = internal error: assertion failed at line 947 in file
 > 0x20058c64), line 3521 in "toplev.c"
 > finish_function(??), line 7050 in "c-decl.c"
 > yyparse(), line 144 in "c-parse.y"
 > compile_file(name = internal error: assertion failed at line 947 in file frame.c
 > "foo.i"), line 2513 in "toplev.c"
--
Kaveh R. Ghazi			Project Manager / Custom Development
ghazi@caip.rutgers.edu		ICon CMT Corp.