* [Bug objc++/58783] fails to cross-compile Qt 5:dev in obj-c++
[not found] <bug-58783-4@http.gcc.gnu.org/bugzilla/>
@ 2013-10-18 11:27 ` sthalik at misaki dot pl
2013-10-18 11:28 ` sthalik at misaki dot pl
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From: sthalik at misaki dot pl @ 2013-10-18 11:27 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58783
Stanisław Halik <sthalik at misaki dot pl> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sthalik at misaki dot pl
--- Comment #1 from Stanisław Halik <sthalik at misaki dot pl> ---
Created attachment 31033
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31033&action=edit
build command
hand-made mkspec could be wrong, i.e. PEBKAC
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From: "sthalik at misaki dot pl" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug objc++/58783] New: fails to cross-compile Qt 5:dev in obj-c++
Date: Fri, 18 Oct 2013 11:27:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX783
Bug ID: 58783
Summary: fails to cross-compile Qt 5:dev in obj-c++
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: objc++
Assignee: unassigned at gcc dot gnu.org
Reporter: sthalik at misaki dot pl
CC: iains at gcc dot gnu.org
This is host=x86_64-pc-linux-gnu, target=i686-apple-darwin10
Compiling Qt fails, attached are preprocessed source and faling command.
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2013-10-18 11:27 ` [Bug objc++/58783] fails to cross-compile Qt 5:dev in obj-c++ sthalik at misaki dot pl
@ 2013-10-18 11:28 ` sthalik at misaki dot pl
2013-10-18 11:47 ` sthalik at misaki dot pl
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From: sthalik at misaki dot pl @ 2013-10-18 11:28 UTC (permalink / raw)
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58783
--- Comment #2 from Stanisław Halik <sthalik at misaki dot pl> ---
Created attachment 31034
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31034&action=edit
FWIW, qt5 mkspec
>From gcc-bugs-return-432121-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 18 11:34:04 2013
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From: "yvan.roux at linaro dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/58784] New: [ARM] LRA legitimate address issue with misalign neon_store
Date: Fri, 18 Oct 2013 11:34:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX784
Bug ID: 58784
Summary: [ARM] LRA legitimate address issue with misalign
neon_store
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: yvan.roux at linaro dot org
Created attachment 31035
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id1035&actioníit
testcase
The attached testcase failed on ARM with LRA enabled during the legitimate
address checking of the movmisaligndi_neon_store insn. Notice that this issue
is the root cause of all the LRA testsuite regressions (in gcc/g++, libstdc++
and fortran).
command line to reproduce:
cc1 -quiet unalign-1.c -march=armv7-a -mfloat-abi=hard -mfpu=neon -marm -O2
-mlra
error on insn:
(insn 12 7 14 2 (set (mem:DI (plus:SI (plus:SI (mult:SI (reg:SI 0 r0 [
sequenceId ])
(const_int 8 [0x8]))
(reg/f:SI 102 sfp))
(const_int -3 [0xfffffffffffffffd])) [2 *_4+0 S8 A8])
(unspec:DI [
(reg:DI 117 [ D.4956 ])
] UNSPEC_MISALIGNED_ACCESS)) unalign-1.c:13 819
{*movmisaligndi_neon_store}
(expr_list:REG_DEAD (reg:DI 117 [ D.4956 ])
(expr_list:REG_DEAD (reg:SI 0 r0 [ sequenceId ])
(nil))))
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug objc++/58783] fails to cross-compile Qt 5:dev in obj-c++
[not found] <bug-58783-4@http.gcc.gnu.org/bugzilla/>
2013-10-18 11:27 ` [Bug objc++/58783] fails to cross-compile Qt 5:dev in obj-c++ sthalik at misaki dot pl
2013-10-18 11:28 ` sthalik at misaki dot pl
@ 2013-10-18 11:47 ` sthalik at misaki dot pl
2013-10-18 11:49 ` sthalik at misaki dot pl
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From: sthalik at misaki dot pl @ 2013-10-18 11:47 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58783
--- Comment #3 from Stanisław Halik <sthalik at misaki dot pl> ---
Created attachment 31036
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31036&action=edit
preprocessed source
>From gcc-bugs-return-432122-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 18 11:47:15 2013
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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/56309] conditional moves instead of compare and branch result in almost 2x slower code
Date: Fri, 18 Oct 2013 11:47:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idV309
--- Comment #31 from rguenther at suse dot de <rguenther at suse dot de> ---
On Fri, 18 Oct 2013, ubizjak at gmail dot com wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?idV309
>
> --- Comment #30 from Uro? Bizjak <ubizjak at gmail dot com> ---
> (In reply to Jakub Jelinek from comment #29)
>
> > On the by-ref-O3.ii testcase there is no change, but by-val-O3.ii seems to
> > be consistently faster, around 20% on AMD 8354 and 35% on Intel 2600.
>
> According to detailed analysis in Comment 26, perhaps a new tuning flag or
> target hook could be used for if-conversion of scalars. Also, I think that -Os
> can still use cmoves due to smaller code size.
But RTL if-conversion still will generate cmov, right?
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From: sthalik at misaki dot pl @ 2013-10-18 11:49 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58783
Stanisław Halik <sthalik at misaki dot pl> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #31036|0 |1
is obsolete| |
--- Comment #4 from Stanisław Halik <sthalik at misaki dot pl> ---
Created attachment 31037
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31037&action=edit
.bz2 for Iain
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/56309] conditional moves instead of compare and branch result in almost 2x slower code
Date: Fri, 18 Oct 2013 11:57:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idV309
--- Comment #32 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to rguenther@suse.de from comment #31)
> But RTL if-conversion still will generate cmov, right?
Sure.
The current if-conversion is performed without any cost model or anything
similar, say even for:
void
foo (int *a, int *b, int *c)
{
int i;
for (i = 0; i < 1024; i += 32)
{
int t1, t2;
#define V(N) \
t1 = a[i + N]; t2 = b[i + N]; \
a[i + N] = c[i + N / 8] ? t1 * (N + 1) / 3 + 21: t2 * (N + 3) / 17 + 9;
V(0) V(1) V(2) V(3) V(4) V(5) V(6) V(7) V(8) V(9)
V(10) V(11) V(12) V(13) V(14) V(15) V(16) V(17) V(18) V(19)
V(20) V(21) V(22) V(23) V(24) V(25) V(26) V(27) V(28) V(29)
V(30) V(31)
}
}
it will just if-convert everything together, performing all the operations
unconditionally and doing lots of conditional moves.
If my patches are way to go, supposedly the vectorizer cost model should take
into account the non-if-converted loop cost instead of if-converted loop cost
and compare that to the cost of the vectorized if-converted loop, though with
multiple basic blocks in loop's body there won't be one cost, but perhaps one
can compute minimum and maximum and average cost or something similar (also
taking into account branch probabilities).
And, for targets where a tree if-conversion would be useful, after adding some
cost model and limiting how many statements we should be running
unconditionally, parts of the if-conversion framework could be used for a
different pass.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58783
--- Comment #5 from Stanisław Halik <sthalik at misaki dot pl> ---
Created attachment 31038
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31038&action=edit
platform info in .s
>From gcc-bugs-return-432128-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 18 12:03:58 2013
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From: "yvan.roux at linaro dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/58785] New: [ARM] LRA issue in Thumb mode with movhi
Date: Fri, 18 Oct 2013 12:03:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idX785
Bug ID: 58785
Summary: [ARM] LRA issue in Thumb mode with movhi
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: yvan.roux at linaro dot org
Created attachment 31039
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id1039&actioníit
testcase
The attached testcase failed on ARM with LRA enabled in Thumb mode (it is a
reduce testcase from the ICE which brakes bootstrap with Thumb).
Here LRA has to deal with thumb1_movhi_insn :
(insn 11 5 14 2 (set (reg:HI 0 r0)
(const_int -1318 [0xfffffffffffffada])) ... {*thumb1_movhi_insn}
(nil))
and creates new regs to do it :
11: r0:HI=r114:HI
Inserting insn reload before:
18: r115:SI=0xfffffffffffffada
19: r114:HI=r115:SI#0
REG_EQUAL 0xfffffffffffffada
Choosing alt 6 in insn 18: (0) l (1) mi {*thumb1_movsi_insn}
Creating newreg\x116 from oldreg\x115, assigning class LO_REGS to r116
18: r116:SI=0xfffffffffffffada
Inserting insn reload after:
20: r115:SI=r116:SI
Creating newreg\x117, assigning class LO_REGS to scratch r117
and during this move processing,
gen_thumb_movhi_clobber(rtx_def*,rtx_def*,rtx_def*) is called with a first rtx
parameter that doesn't satisfy the constraint of being a strict memory address
(it is a register).
command line to reproduce:
cc1 -quiet thumb2-lra.i -O2 -mthumb -mlra
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug objc++/58783] fails to cross-compile Qt 5:dev in obj-c++
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From: iains at gcc dot gnu.org @ 2013-10-18 12:18 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58783
Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-10-18
Ever confirmed|0 |1
--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
confirmed on a x86-64-darwin12 X i686-darwin10, but the test case could use
some reduction.
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@ 2013-10-19 12:58 ` iains at gcc dot gnu.org
2014-11-19 22:01 ` egall at gwmail dot gwu.edu
2021-12-21 19:03 ` [Bug objc++/58783] Fast enumeration is not supported for Objective-C++ egallager at gcc dot gnu.org
8 siblings, 0 replies; 9+ messages in thread
From: iains at gcc dot gnu.org @ 2013-10-19 12:58 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58783
Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
--- Comment #7 from Iain Sandoe <iains at gcc dot gnu.org> ---
at present, fast enumeration is only supported by GCC for Objective-C (both GNU
and NeXT/Apple runtimes).
we will need to investigate what is required to extend this to Objective-C++.
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2021-12-21 19:03 ` [Bug objc++/58783] Fast enumeration is not supported for Objective-C++ egallager at gcc dot gnu.org
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From: egall at gwmail dot gwu.edu @ 2014-11-19 22:01 UTC (permalink / raw)
To: gcc-bugs
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Eric Gallager <egall at gwmail dot gwu.edu> changed:
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----------------------------------------------------------------------------
CC| |egall at gwmail dot gwu.edu
--- Comment #8 from Eric Gallager <egall at gwmail dot gwu.edu> ---
I recently ran into this with the Cocoa interface for DeSmuME, which also tries
to use fast enumeration from Objective-C++. So maybe this should be re-titled
to reflect the fact that it's a more general issue with fast enumeration in
Objective-C++, and not anything Qt5-specific.
^ permalink raw reply [flat|nested] 9+ messages in thread* [Bug objc++/58783] Fast enumeration is not supported for Objective-C++
[not found] <bug-58783-4@http.gcc.gnu.org/bugzilla/>
` (7 preceding siblings ...)
2014-11-19 22:01 ` egall at gwmail dot gwu.edu
@ 2021-12-21 19:03 ` egallager at gcc dot gnu.org
8 siblings, 0 replies; 9+ messages in thread
From: egallager at gcc dot gnu.org @ 2021-12-21 19:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58783
--- Comment #10 from Eric Gallager <egallager at gcc dot gnu.org> ---
Note that on the Standards page of the manual, it currently says "fast
enumeration (only for Objective-C)", so once this bug is fixed, that
parenthetical can be removed:
https://gcc.gnu.org/onlinedocs/gcc/Standards.html#Standards
^ permalink raw reply [flat|nested] 9+ messages in thread