* [Bug tree-optimization/55052] [4.8 regression] vect-widening tests are failing and giving wrong results
2012-10-24 10:37 [Bug tree-optimization/55052] New: [4.8 regression] vect-widening tests are failing and giving wrong results ramana at gcc dot gnu.org
@ 2012-10-24 10:38 ` ramana at gcc dot gnu.org
2012-10-24 10:57 ` rguenth at gcc dot gnu.org
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From: ramana at gcc dot gnu.org @ 2012-10-24 10:38 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55052
Ramana Radhakrishnan <ramana at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |arm-linux-gnueabi
Status|UNCONFIRMED |NEW
Last reconfirmed| |2012-10-24
Ever Confirmed|0 |1
--- Comment #1 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> 2012-10-24 10:37:48 UTC ---
--target=arm-linux-gnueabi --with-cpu=cortex-a15 --with-fpu=neon
--with-float=softfp
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/55052] [4.8 regression] vect-widening tests are failing and giving wrong results
2012-10-24 10:37 [Bug tree-optimization/55052] New: [4.8 regression] vect-widening tests are failing and giving wrong results ramana at gcc dot gnu.org
2012-10-24 10:38 ` [Bug tree-optimization/55052] " ramana at gcc dot gnu.org
@ 2012-10-24 10:57 ` rguenth at gcc dot gnu.org
2012-11-28 2:23 ` ramana at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2012-10-24 10:57 UTC (permalink / raw)
To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.8.0
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/55052] [4.8 regression] vect-widening tests are failing and giving wrong results
2012-10-24 10:37 [Bug tree-optimization/55052] New: [4.8 regression] vect-widening tests are failing and giving wrong results ramana at gcc dot gnu.org
2012-10-24 10:38 ` [Bug tree-optimization/55052] " ramana at gcc dot gnu.org
2012-10-24 10:57 ` rguenth at gcc dot gnu.org
@ 2012-11-28 2:23 ` ramana at gcc dot gnu.org
2012-11-28 2:26 ` ramana at gcc dot gnu.org
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From: ramana at gcc dot gnu.org @ 2012-11-28 2:23 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55052
--- Comment #3 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> 2012-11-28 02:23:33 UTC ---
fwprop in the failure case ends up replacing .
In insn 50, replacing
(sign_extend:V4SI (ashift:V4HI (subreg:V4HI (reg:V8HI 269 [ vect_var_.41 ]) 8)
(const_int 3 [0x3])))
with (const_vector:V4SI [
(const_int 0 [0])
(const_int 0 [0])
(const_int 0 [0])
(const_int 0 [0])
])
but that can't be right ..... especially if the value in reg 269 is essentially
out of a vld4.
33 r269:V8HI=zero_extend(vec_select(r268:V16QI,parallel))
34 r270:V8HI=zero_extend(vec_select(r268:V16QI,parallel))
35 r1211:V16QI=const_vector
36 r275:V16QI=r1211:V16QI&r1196:XI#32
37 r276:V8HI=zero_extend(vec_select(r275:V16QI,parallel))
38 r277:V8HI=zero_extend(vec_select(r275:V16QI,parallel))
39 r1212:V4SI=sign_extend(r269:V8HI#0<<0x3)
40 r1213:V4SI=zero_extend(vec_select(r252:V8HI,parallel))
41 r1214:V4SI=r1213:V4SI>>const_vector
42 r1215:V4SI=r1212:V4SI|r1214:V4SI
43 r1216:V4SI=sign_extend(r276:V8HI#0<<0x8)
44 r1217:V4SI=r1215:V4SI|r1216:V4SI
45 r1218:V4SI=zero_extend(vec_select(r258:V8HI,parallel))
46 r1219:V4SI=r1218:V4SI>>const_vector
47 r1220:V4SI=r1217:V4SI|r1219:V4SI
48 [r1198:SI]=unspec[r1220:V4SI] 164
50 r1221:V4SI=sign_extend(r269:V8HI#8<<0x3)
Attached is a .i file and associated dumps.
Ramana
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2012-10-24 10:37 [Bug tree-optimization/55052] New: [4.8 regression] vect-widening tests are failing and giving wrong results ramana at gcc dot gnu.org
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2012-11-28 2:23 ` ramana at gcc dot gnu.org
@ 2012-11-28 2:26 ` ramana at gcc dot gnu.org
2012-11-28 2:30 ` pinskia at gcc dot gnu.org
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From: ramana at gcc dot gnu.org @ 2012-11-28 2:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55052
--- Comment #4 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> 2012-11-28 02:25:38 UTC ---
Created attachment 28812
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28812
testcase and dumps.
regenerate with command line options
-mcpu=cortex-a15 -mfpu=neon -mfloat-abi=hard -O3
on a cross-compiler configured for arm-linux-gnueabi
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/55052] [4.8 regression] vect-widening tests are failing and giving wrong results
2012-10-24 10:37 [Bug tree-optimization/55052] New: [4.8 regression] vect-widening tests are failing and giving wrong results ramana at gcc dot gnu.org
` (3 preceding siblings ...)
2012-11-28 2:26 ` ramana at gcc dot gnu.org
@ 2012-11-28 2:30 ` pinskia at gcc dot gnu.org
2012-11-28 20:28 ` rsandifo at gcc dot gnu.org
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From: pinskia at gcc dot gnu.org @ 2012-11-28 2:30 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-11-28 02:29:53 UTC ---
Sounds like a case of a missing check for VECTOR modes when it is doing the
subreg as a truncation optimization.
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2012-10-24 10:37 [Bug tree-optimization/55052] New: [4.8 regression] vect-widening tests are failing and giving wrong results ramana at gcc dot gnu.org
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2012-11-28 2:30 ` pinskia at gcc dot gnu.org
@ 2012-11-28 20:28 ` rsandifo at gcc dot gnu.org
2012-11-28 21:45 ` rsandifo at gcc dot gnu.org
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From: rsandifo at gcc dot gnu.org @ 2012-11-28 20:28 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55052
rsandifo@gcc.gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|unassigned at gcc dot |rsandifo at gcc dot gnu.org
|gnu.org |
--- Comment #6 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 2012-11-28 20:28:06 UTC ---
(In reply to comment #5)
> Sounds like a case of a missing check for VECTOR modes when it is doing the
> subreg as a truncation optimization.
Yeah, looks like a SCALAR_INT_MODE_P got cut in the process.
Testing a patch.
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/55052] [4.8 regression] vect-widening tests are failing and giving wrong results
2012-10-24 10:37 [Bug tree-optimization/55052] New: [4.8 regression] vect-widening tests are failing and giving wrong results ramana at gcc dot gnu.org
` (5 preceding siblings ...)
2012-11-28 20:28 ` rsandifo at gcc dot gnu.org
@ 2012-11-28 21:45 ` rsandifo at gcc dot gnu.org
2012-11-28 21:46 ` rsandifo at gcc dot gnu.org
2012-11-29 13:30 ` ramana at gcc dot gnu.org
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From: rsandifo at gcc dot gnu.org @ 2012-11-28 21:45 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55052
--- Comment #7 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 2012-11-28 21:45:08 UTC ---
Author: rsandifo
Date: Wed Nov 28 21:45:03 2012
New Revision: 193909
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=193909
Log:
gcc/
PR rtl-optimization/55052
* simplify-rtx.c (simplify_subreg): Restore SCALAR_INT_MODE_P check.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/simplify-rtx.c
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2012-10-24 10:37 [Bug tree-optimization/55052] New: [4.8 regression] vect-widening tests are failing and giving wrong results ramana at gcc dot gnu.org
` (6 preceding siblings ...)
2012-11-28 21:45 ` rsandifo at gcc dot gnu.org
@ 2012-11-28 21:46 ` rsandifo at gcc dot gnu.org
2012-11-29 13:30 ` ramana at gcc dot gnu.org
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From: rsandifo at gcc dot gnu.org @ 2012-11-28 21:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55052
rsandifo@gcc.gnu.org <rsandifo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #8 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 2012-11-28 21:46:12 UTC ---
Patch applied.
^ permalink raw reply [flat|nested] 10+ messages in thread* [Bug tree-optimization/55052] [4.8 regression] vect-widening tests are failing and giving wrong results
2012-10-24 10:37 [Bug tree-optimization/55052] New: [4.8 regression] vect-widening tests are failing and giving wrong results ramana at gcc dot gnu.org
` (7 preceding siblings ...)
2012-11-28 21:46 ` rsandifo at gcc dot gnu.org
@ 2012-11-29 13:30 ` ramana at gcc dot gnu.org
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From: ramana at gcc dot gnu.org @ 2012-11-29 13:30 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #9 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> 2012-11-29 13:29:46 UTC ---
(In reply to comment #8)
> Patch applied.
fixes the issue and the another issue in perlbmk which had the exactly the same
symptoms
Thanks.
ramana
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