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* [Bug c/27968] New: gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs
@ 2006-06-09 0:00 digitale at digitaleric dot net
2006-06-09 0:17 ` [Bug target/27968] " pinskia at gcc dot gnu dot org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: digitale at digitaleric dot net @ 2006-06-09 0:00 UTC (permalink / raw)
To: gcc-bugs
GCC emits the (undefined) instruction ffreep when TARGET_USE_FFREEP is set
(which happens when -mtune opteron or -mtune athlon is passed on the command
line.
As of the latest available build, Solaris' /usr/ccs/bin/as doesn't understand
this opcode and barfs.
The use of ffreep seems to have been introduced and discussed in this thread:
http://gcc.gnu.org/ml/gcc-patches/2002-11/msg01386.html.
--
Summary: gcc emits (undefined) ffreep opcode which is not
understood by Solaris' /usr/ccs/bin/as when tuning for
Athlon or Opteron CPUs
Product: gcc
Version: 4.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: digitale at digitaleric dot net
GCC host triplet: i386-pc-solaris2.11
GCC target triplet: i386-pc-solaris2.11
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27968
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug target/27968] gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs 2006-06-09 0:00 [Bug c/27968] New: gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs digitale at digitaleric dot net @ 2006-06-09 0:17 ` pinskia at gcc dot gnu dot org 2006-06-09 5:46 ` pinskia at gcc dot gnu dot org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2006-06-09 0:17 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from pinskia at gcc dot gnu dot org 2006-06-09 00:05 ------- One thing is to use GNU binutil's as instead. The other thing to do is to file a bug with Sun (which is better anyways). -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Component|c |target http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27968 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/27968] gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs 2006-06-09 0:00 [Bug c/27968] New: gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs digitale at digitaleric dot net 2006-06-09 0:17 ` [Bug target/27968] " pinskia at gcc dot gnu dot org @ 2006-06-09 5:46 ` pinskia at gcc dot gnu dot org 2006-06-10 18:52 ` digitale at digitaleric dot net ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2006-06-09 5:46 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from pinskia at gcc dot gnu dot org 2006-06-09 05:37 ------- First off this instruction has been in x87 since at least 287, see http://www.sandpile.org/post/msgs/20000234.htm. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27968 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/27968] gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs 2006-06-09 0:00 [Bug c/27968] New: gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs digitale at digitaleric dot net 2006-06-09 0:17 ` [Bug target/27968] " pinskia at gcc dot gnu dot org 2006-06-09 5:46 ` pinskia at gcc dot gnu dot org @ 2006-06-10 18:52 ` digitale at digitaleric dot net 2006-07-07 0:13 ` sayle at gcc dot gnu dot org 2006-10-05 15:44 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: digitale at digitaleric dot net @ 2006-06-10 18:52 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from digitale at digitaleric dot net 2006-06-10 18:01 ------- Subject: Re: gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs > ------- Comment #1 from pinskia at gcc dot gnu dot org 2006-06-09 00:05 ------- > One thing is to use GNU binutil's as instead. The other thing to do is to file > a bug with Sun (which is better anyways). I have filed a bug with Sun. But I think it would be good to fix gcc too. Jan Hubicka's comment on the adding the ffreep support to gcc was: "The instruction is not documented by IA-32 description, but all CPUs in existence support it and majorty of assemblers seems to know it too. In case we will hit assembler that don't I will add configure script code for that." I also question if it is a mistake for gcc to emit this opcode so readily. Quoting the Intel IA-32 manual: "all blanks in the opcode map are reserved and should not be used. Do not depend on the operation on these undefined opcodes" (this is below the opcode map, where the row for ffreep is blank). -Eric -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27968 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/27968] gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs 2006-06-09 0:00 [Bug c/27968] New: gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs digitale at digitaleric dot net ` (2 preceding siblings ...) 2006-06-10 18:52 ` digitale at digitaleric dot net @ 2006-07-07 0:13 ` sayle at gcc dot gnu dot org 2006-10-05 15:44 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: sayle at gcc dot gnu dot org @ 2006-07-07 0:13 UTC (permalink / raw) To: gcc-bugs ------- Comment #4 from sayle at gcc dot gnu dot org 2006-07-07 00:13 ------- Subject: Bug 27968 Author: sayle Date: Fri Jul 7 00:13:14 2006 New Revision: 115237 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=115237 Log: PR target/27968 * configure.ac (HAVE_AS_IX86_FFREEP): On x86 targets check whether the configured assembler supports the x87's ffreep mnemonic. * configure: Regenerate. * config.in: Regenerate. * config/i386/i386.c (output_387_ffreep): New function. (output_fp_compare): Use output_387_ffreep to emit ffreep insns. (output_387_reg_move): Likewise. Modified: trunk/gcc/ChangeLog trunk/gcc/config.in trunk/gcc/config/i386/i386.c trunk/gcc/configure trunk/gcc/configure.ac -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27968 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/27968] gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs 2006-06-09 0:00 [Bug c/27968] New: gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs digitale at digitaleric dot net ` (3 preceding siblings ...) 2006-07-07 0:13 ` sayle at gcc dot gnu dot org @ 2006-10-05 15:44 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2006-10-05 15:44 UTC (permalink / raw) To: gcc-bugs ------- Comment #5 from pinskia at gcc dot gnu dot org 2006-10-05 15:44 ------- Fixed. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |FIXED Target Milestone|--- |4.2.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27968 ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2006-10-05 15:44 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2006-06-09 0:00 [Bug c/27968] New: gcc emits (undefined) ffreep opcode which is not understood by Solaris' /usr/ccs/bin/as when tuning for Athlon or Opteron CPUs digitale at digitaleric dot net 2006-06-09 0:17 ` [Bug target/27968] " pinskia at gcc dot gnu dot org 2006-06-09 5:46 ` pinskia at gcc dot gnu dot org 2006-06-10 18:52 ` digitale at digitaleric dot net 2006-07-07 0:13 ` sayle at gcc dot gnu dot org 2006-10-05 15:44 ` pinskia at gcc dot gnu dot org
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