RE: fortran/6304: Failure of LAPACK test dtest on irix6.5 with -mabi=64 -O2

["Billinghurst, David \(CRTS\)" <David.Billinghurst@riotinto.com>]

The following reply was made to PR fortran/6304; it has been noted by GNATS.

From: "Billinghurst, David (CRTS)" <David.Billinghurst@riotinto.com>
To: <toon@gcc.gnu.org>,
	<gcc-gnats@gcc.gnu.org>
Cc: <jh@suse.cz>
Subject: RE: fortran/6304: Failure of LAPACK test dtest on irix6.5 with -mabi=64 -O2
Date: Mon, 22 Apr 2002 00:25:06 +1000

 Test case is now attached to PR.  Either GNATS lost the original, or I=20
 forgot to attach it. =20
 
 The reduced test case last passed at 2001-12-13 11:30 UTC.  The patch =
 that=20
 introduced (or uncovered) this failure also broke irix bootstrap.  I=20
 identified and applied the fix by rth that allows bootstrapping to=20
 confirm this analysis.
 
 The test that triggers the failure is =20
 
 Thu Dec 13 12:31:07 CET 2001  Jan Hubicka  <jh@suse.cz>
 
 	* predict.c (estimate_probability): Reorganize opcode heuristics.
 	* predict.def (PRED_OPCODE_POSITIVE, PRED_OPCODE_NONEQUAL,
 	PRED_FPOPCODE): New.
 
 	* i386.c (override_options): Recognize various CPU variants and set
 	SSE/MMX/3dNOW flags accordingly.
 	* i386.h (MASK_MMX_SET, MASK_SSE_SET, MASK_SSE2_SET, MASK_3DNOW_SET,
 	MASK_3DNOW_A_SET): New.
 	(MASK_ACCUMULATE_OUTGOING_ARGS_SET): New.
 	(MASK_NO_ACCUMULATE_OUTGOING_ARGS): Delete.
 	(MASK_*): Renumber.
 	(TARGET_FLAGS): Use new masks.
 	(CPP_CPU_SPECS): Recognize new CPU variants.
 	* invoke.texi (-mcpu): Update documentation.
 
 	* flags.h (flag_prefetch_loop_arrays): Declare.
 	* loop.h (LOOP_PREFETCH): Define new constant.
 	* loop.c (strength_reduce): Call emit_prefetch_instructions.
 	(MAX_PREFETCHES, PREFETCH_BLOCKS_BEFORE_LOOP_MAX,
 	PREFETCH_BLOCKS_BEFORE_LOOP_MIN, PREFETCH_BLOCKS_IN_LOOP_MIN): New
 	constants.
 	(check_store_data): New structure.
 	(check_store, emit_prefetch_instructions, rtx_equal_for_prefetch_p):
 	New functions.
 	* toplev.c: Include insn-flags.h.
 	(flag_prefetch_loop_arrays): New global variable.
 	(lang_independent_option): Add -fprefetch-loop-arrays.
 	(rest_of_compilation) Pass LOOP_PREFETCH when flag_prefetch_loop_arrays
 	is set.
 	* Makefile.in (toplev.c): Depend on insn-flags.h.
 	* invoke.texi (-fprefetch-loop-arrays): Document.
 
 	* predict.c (estimate_probability): Distribute the loop exit
 	probability according to number of exit edges.
 
 	* cfgcleanup.c (insns_match_p): Break out from ...;
 	(flow_find_cross_jump): ... here;
 	(outgoing_edges_match): Add parameter MODE; attempt to match everything
 	except for tablejumps.
 	(try_crossjump_to_edge): Accept complex edges.
 	(try_crossjump_bb): Likewise.
 
 
 The patch that enabled irix6.5 bootstrap is
 
 2001-12-16  Richard Henderson  <rth@redhat.com>
 
 	* toplev.c (parse_options_and_default_flags): Don't enable
 	flag_cprop_registers at -O1.