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* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
@ 2012-07-15 20:09 ` olegendo at gcc dot gnu.org
2012-07-15 21:32 ` olegendo at gcc dot gnu.org
` (14 subsequent siblings)
15 siblings, 0 replies; 16+ messages in thread
From: olegendo at gcc dot gnu.org @ 2012-07-15 20:09 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
Oleg Endo <olegendo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |olegendo at gcc dot gnu.org
--- Comment #1 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-07-15 20:08:49 UTC ---
(In reply to comment #0)
> The documentation of -ffinite-math-only states
> "This option should never be turned on by any '-O' option"
>
> but for sh's -mieee it is said "the default is set to -ffinite-math-only"
> (-mieee is unset by default)
>
> as a result the -ffinite-math-only is turned on by default for the sh for all
> optimisation levels.
>
> on chapter 2 it was reenforced that: ... "*By default*, it (gcc) will act as
> the compiler for a hosted implementation" ... and a conforming hosted
> implementation
> supports the whole standard.
>
> So either the documentation is false or infinite float values should be
> supported (by default).
> The ability to perform optimum floating point code is preserved by explicitly
> setting it.
The SH -mieee option documentation is wrong.
-ffinite-math-only is not enabled by default (maybe it used to be some time
ago?). Thus, -mieee is enabled by default (and -mno-ieee has no effect).
Moreover, the documentation part
"... getting IEEE-conforming results for comparisons of NANs / infinities
incurs extra overhead in every floating-point comparison..."
is confusing, because this is not what the compiler actually does. If I
observe correctly, the only cases where two fcmp instructions are generated are
when doing '>=' or '<=' comparisons.
I would suggest to make the -mieee option control only the FPU comparisons and
not make it change the flag_finite_math_only. Also support for -mno-ieee
should be added.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
2012-07-15 20:09 ` [Bug target/33135] [SH] -ffinite-math-only should not be on by default olegendo at gcc dot gnu.org
@ 2012-07-15 21:32 ` olegendo at gcc dot gnu.org
2012-07-16 0:18 ` kkojima at gcc dot gnu.org
` (13 subsequent siblings)
15 siblings, 0 replies; 16+ messages in thread
From: olegendo at gcc dot gnu.org @ 2012-07-15 21:32 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
Oleg Endo <olegendo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kkojima at gcc dot gnu.org
--- Comment #2 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-07-15 21:32:17 UTC ---
Kaz, do you have any thoughts on this?
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
2012-07-15 20:09 ` [Bug target/33135] [SH] -ffinite-math-only should not be on by default olegendo at gcc dot gnu.org
2012-07-15 21:32 ` olegendo at gcc dot gnu.org
@ 2012-07-16 0:18 ` kkojima at gcc dot gnu.org
2012-07-16 20:51 ` olegendo at gcc dot gnu.org
` (12 subsequent siblings)
15 siblings, 0 replies; 16+ messages in thread
From: kkojima at gcc dot gnu.org @ 2012-07-16 0:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #3 from Kazumoto Kojima <kkojima at gcc dot gnu.org> 2012-07-16 00:18:11 UTC ---
(In reply to comment #2)
You are right. Our sh_option_override has code like this:
if (flag_finite_math_only == 2)
flag_finite_math_only
= !flag_signaling_nans && TARGET_SH2E && ! TARGET_IEEE;
if (TARGET_SH2E && !flag_finite_math_only)
target_flags |= MASK_IEEE;
Before 4.6, we set flag_finite_math_only to 2 in sh_optimization_options
and tried to set it to 2 with sh_option_init_struct in 4.6, though
the latter looks failed to work. Thus before 4.6, the 2nd if
close in the above code doesn't effect but now MASK_IEEE is set
with it. Ugh.
I guess that the better default would be -mno-ieee for bare metals
and -mieee for linux.
Maybe your proposal + removing the above lines and the patch like
--- ORIG/trunk/gcc/config/sh/linux.h 2012-03-08 09:57:48.000000000 +0900
+++ trunk/gcc/config/sh/linux.h 2012-07-16 08:59:57.000000000 +0900
@@ -41,7 +41,7 @@ along with GCC; see the file COPYING3.
#undef TARGET_DEFAULT
#define TARGET_DEFAULT \
- (TARGET_CPU_DEFAULT | MASK_USERMODE | TARGET_ENDIAN_DEFAULT \
+ (TARGET_CPU_DEFAULT | MASK_USERMODE | MASK_IEEE | TARGET_ENDIAN_DEFAULT \
| TARGET_OPT_DEFAULT)
#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
will be reasonable and the most unsurprising way to go.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (2 preceding siblings ...)
2012-07-16 0:18 ` kkojima at gcc dot gnu.org
@ 2012-07-16 20:51 ` olegendo at gcc dot gnu.org
2012-07-16 22:15 ` kkojima at gcc dot gnu.org
` (11 subsequent siblings)
15 siblings, 0 replies; 16+ messages in thread
From: olegendo at gcc dot gnu.org @ 2012-07-16 20:51 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #4 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-07-16 20:50:50 UTC ---
(In reply to comment #3)
> I guess that the better default would be -mno-ieee for bare metals
Hm ... Is there a particular reason to distinguish between linux and non-linux?
I was actually thinking of tying -mno-ieee to -ffinite-math-only in the
following way:
no options -> implicit -fno-finite-math-only -mieee
-ffinite-math-only -> disable ieee fcmp, allow other optimizations
-ffinite-math-only -mieee -> enable ieee fcmp, allow other optimizations
-mno-ieee -> disable ieee fcmp, disallow other optimizations
I think if faster FPU code is desired, most likely the -ffast-math (or some
sub-option like -ffinite-math-only) will be consulted in the first place. In
case of bare metal configurations, users will probably tweak their specific
options.
Thus, I did not want to distinguish between linux or non-linux here.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (3 preceding siblings ...)
2012-07-16 20:51 ` olegendo at gcc dot gnu.org
@ 2012-07-16 22:15 ` kkojima at gcc dot gnu.org
2012-07-18 7:50 ` olegendo at gcc dot gnu.org
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From: kkojima at gcc dot gnu.org @ 2012-07-16 22:15 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #5 from Kazumoto Kojima <kkojima at gcc dot gnu.org> 2012-07-16 22:15:40 UTC ---
(In reply to comment #4)
> Thus, I did not want to distinguish between linux or non-linux here.
I have no strong feelings about the bare metal case.
We didn't catch any complaints for defaulting -mieee in 4.6
and 4.7 compilers. It could be a proof of your argument.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (4 preceding siblings ...)
2012-07-16 22:15 ` kkojima at gcc dot gnu.org
@ 2012-07-18 7:50 ` olegendo at gcc dot gnu.org
2012-07-18 9:16 ` olegendo at gcc dot gnu.org
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From: olegendo at gcc dot gnu.org @ 2012-07-18 7:50 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #6 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-07-18 07:49:56 UTC ---
Author: olegendo
Date: Wed Jul 18 07:49:50 2012
New Revision: 189602
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189602
Log:
PR target/33135
* config/sh/sh.opt (mieee): Use Var instead of Mask. Correct
description.
* config/sh/sh.c (sh_option_override): Do not change
flag_finite_math_only. Set TARGET_IEEE to complement of
flag_finite_math_only.
* doc/invoke.texi (SH options): Add mno-ieee. Correct description
of mieee and mno-ieee behavior.
PR target/33135
* gcc.target/sh/pr33135-1.c: New.
* gcc.target/sh/pr33135-2.c: New.
* gcc.target/sh/pr33135-3.c: New.
* gcc.target/sh/pr33135-4.c: New.
Added:
trunk/gcc/testsuite/gcc.target/sh/pr33135-1.c
trunk/gcc/testsuite/gcc.target/sh/pr33135-2.c
trunk/gcc/testsuite/gcc.target/sh/pr33135-3.c
trunk/gcc/testsuite/gcc.target/sh/pr33135-4.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/sh/sh.c
trunk/gcc/config/sh/sh.opt
trunk/gcc/doc/invoke.texi
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (5 preceding siblings ...)
2012-07-18 7:50 ` olegendo at gcc dot gnu.org
@ 2012-07-18 9:16 ` olegendo at gcc dot gnu.org
2012-07-18 9:32 ` kkojima at gcc dot gnu.org
` (8 subsequent siblings)
15 siblings, 0 replies; 16+ messages in thread
From: olegendo at gcc dot gnu.org @ 2012-07-18 9:16 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #7 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-07-18 09:16:28 UTC ---
Should this be backported to 4.6 or 4.7?
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (6 preceding siblings ...)
2012-07-18 9:16 ` olegendo at gcc dot gnu.org
@ 2012-07-18 9:32 ` kkojima at gcc dot gnu.org
2012-07-22 23:45 ` olegendo at gcc dot gnu.org
` (7 subsequent siblings)
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From: kkojima at gcc dot gnu.org @ 2012-07-18 9:32 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #8 from Kazumoto Kojima <kkojima at gcc dot gnu.org> 2012-07-18 09:32:08 UTC ---
(In reply to comment #7)
> Should this be backported to 4.6 or 4.7?
Maybe. It could be counted as a regression from 4.5 because currently
we have no way to disable mieee on those branches.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (7 preceding siblings ...)
2012-07-18 9:32 ` kkojima at gcc dot gnu.org
@ 2012-07-22 23:45 ` olegendo at gcc dot gnu.org
2012-07-22 23:50 ` olegendo at gcc dot gnu.org
` (6 subsequent siblings)
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From: olegendo at gcc dot gnu.org @ 2012-07-22 23:45 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #9 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-07-22 23:44:49 UTC ---
Author: olegendo
Date: Sun Jul 22 23:44:45 2012
New Revision: 189761
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189761
Log:
PR target/33135
* config/sh/sh.opt (mieee): Use Var instead of Mask. Correct
description.
* config/sh/sh.c (sh_option_override): Do not change
flag_finite_math_only. Set TARGET_IEEE to complement of
flag_finite_math_only.
* doc/invoke.texi (SH options): Add mno-ieee. Correct
description of mieee and mno-ieee behavior.
Modified:
branches/gcc-4_7-branch/gcc/ChangeLog
branches/gcc-4_7-branch/gcc/config/sh/sh.c
branches/gcc-4_7-branch/gcc/config/sh/sh.opt
branches/gcc-4_7-branch/gcc/doc/invoke.texi
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (8 preceding siblings ...)
2012-07-22 23:45 ` olegendo at gcc dot gnu.org
@ 2012-07-22 23:50 ` olegendo at gcc dot gnu.org
2012-07-22 23:53 ` olegendo at gcc dot gnu.org
` (5 subsequent siblings)
15 siblings, 0 replies; 16+ messages in thread
From: olegendo at gcc dot gnu.org @ 2012-07-22 23:50 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #10 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-07-22 23:50:00 UTC ---
Author: olegendo
Date: Sun Jul 22 23:49:56 2012
New Revision: 189762
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=189762
Log:
PR target/33135
* config/sh/sh.opt (mieee): Use Var instead of Mask. Correct
description.
* config/sh/sh.c (sh_option_override): Do not change
flag_finite_math_only. Set TARGET_IEEE to complement of
flag_finite_math_only.
* doc/invoke.texi (SH options): Add mno-ieee. Correct
description of mieee and mno-ieee behavior.
Modified:
branches/gcc-4_6-branch/gcc/ChangeLog
branches/gcc-4_6-branch/gcc/config/sh/sh.c
branches/gcc-4_6-branch/gcc/config/sh/sh.opt
branches/gcc-4_6-branch/gcc/doc/invoke.texi
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (9 preceding siblings ...)
2012-07-22 23:50 ` olegendo at gcc dot gnu.org
@ 2012-07-22 23:53 ` olegendo at gcc dot gnu.org
2012-09-01 20:15 ` olegendo at gcc dot gnu.org
` (4 subsequent siblings)
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From: olegendo at gcc dot gnu.org @ 2012-07-22 23:53 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
Oleg Endo <olegendo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |FIXED
--- Comment #11 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-07-22 23:52:58 UTC ---
Fixed on 4.8, 4.7.2, 4.6.4.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (10 preceding siblings ...)
2012-07-22 23:53 ` olegendo at gcc dot gnu.org
@ 2012-09-01 20:15 ` olegendo at gcc dot gnu.org
2012-09-02 22:43 ` kkojima at gcc dot gnu.org
` (3 subsequent siblings)
15 siblings, 0 replies; 16+ messages in thread
From: olegendo at gcc dot gnu.org @ 2012-09-01 20:15 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
Oleg Endo <olegendo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Last reconfirmed| |2012-09-01
Resolution|FIXED |
Ever Confirmed|0 |1
--- Comment #12 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-09-01 20:15:17 UTC ---
Although this has been closed, I've just discovered something that I believe
can go away:
gcc/common/sh/sh-common.c (sh_option_init_struct):
---
/* We can't meaningfully test TARGET_SH2E / TARGET_IEEE
here, so leave it to TARGET_OPTION_OVERRIDE to set
flag_finite_math_only. We set it to 2 here so we know if the user
explicitly requested this to be on or off. */
opts->x_flag_finite_math_only = 2;
----
TARGET_OPTION_OVERRIDE does not set 'flag_finite_math_only' any longer.
Kaz, would it be OK to remove the whole function 'sh_option_init_struct' from
gcc/common/sh/sh-common.c ?
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (11 preceding siblings ...)
2012-09-01 20:15 ` olegendo at gcc dot gnu.org
@ 2012-09-02 22:43 ` kkojima at gcc dot gnu.org
2012-09-02 23:18 ` olegendo at gcc dot gnu.org
` (2 subsequent siblings)
15 siblings, 0 replies; 16+ messages in thread
From: kkojima at gcc dot gnu.org @ 2012-09-02 22:43 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #13 from Kazumoto Kojima <kkojima at gcc dot gnu.org> 2012-09-02 22:43:07 UTC ---
(In reply to comment #12)
> Kaz, would it be OK to remove the whole function 'sh_option_init_struct' from
> gcc/common/sh/sh-common.c ?
Definitely.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (12 preceding siblings ...)
2012-09-02 22:43 ` kkojima at gcc dot gnu.org
@ 2012-09-02 23:18 ` olegendo at gcc dot gnu.org
2012-09-03 9:46 ` olegendo at gcc dot gnu.org
2012-10-04 18:32 ` olegendo at gcc dot gnu.org
15 siblings, 0 replies; 16+ messages in thread
From: olegendo at gcc dot gnu.org @ 2012-09-02 23:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #14 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-09-02 23:18:11 UTC ---
Author: olegendo
Date: Sun Sep 2 23:18:08 2012
New Revision: 190865
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=190865
Log:
PR target/33135
* common/config/sh/sh-common.c: Update copyright years.
(sh_option_init_struct): Delete.
(TARGET_OPTION_INIT_STRUCT): Likewise.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/common/config/sh/sh-common.c
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (13 preceding siblings ...)
2012-09-02 23:18 ` olegendo at gcc dot gnu.org
@ 2012-09-03 9:46 ` olegendo at gcc dot gnu.org
2012-10-04 18:32 ` olegendo at gcc dot gnu.org
15 siblings, 0 replies; 16+ messages in thread
From: olegendo at gcc dot gnu.org @ 2012-09-03 9:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
Oleg Endo <olegendo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution| |FIXED
--- Comment #15 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-09-03 09:46:40 UTC ---
Leftover of this issue in gcc/common/sh/sh-common.c has been removed. Closed
again.
^ permalink raw reply [flat|nested] 16+ messages in thread
* [Bug target/33135] [SH] -ffinite-math-only should not be on by default
[not found] <bug-33135-4@http.gcc.gnu.org/bugzilla/>
` (14 preceding siblings ...)
2012-09-03 9:46 ` olegendo at gcc dot gnu.org
@ 2012-10-04 18:32 ` olegendo at gcc dot gnu.org
15 siblings, 0 replies; 16+ messages in thread
From: olegendo at gcc dot gnu.org @ 2012-10-04 18:32 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33135
--- Comment #16 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-10-04 18:32:26 UTC ---
Author: olegendo
Date: Thu Oct 4 18:32:20 2012
New Revision: 192097
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=192097
Log:
PR target/33135
* config/sh/t-sh (HOST_LIBGCC2_CFLAGS): Delete.
* config/sh/t-netbsd (HOST_LIBGCC2_CFLAGS): Delete.
* config/sh/t-linux (HOST_LIBGCC2_CFLAGS): Remove mieee option.
Modified:
trunk/gcc/config/sh/sh.md
trunk/gcc/testsuite/gcc.target/sh/pr52933-1.c
trunk/libgcc/ChangeLog
trunk/libgcc/config/sh/t-linux
trunk/libgcc/config/sh/t-netbsd
trunk/libgcc/config/sh/t-sh
^ permalink raw reply [flat|nested] 16+ messages in thread
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