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* [Bug target/65261] New: [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment
@ 2015-03-01 11:44 trippels at gcc dot gnu.org
2015-03-01 12:12 ` [Bug target/65261] " trippels at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: trippels at gcc dot gnu.org @ 2015-03-01 11:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65261
Bug ID: 65261
Summary: [5 Regression] bootstrap-ubsan ppc64le:
gcc/libcpp/lex.c:552:30: runtime error: load of
misaligned address 0x01002172dfc6 for type 'const
uchar', which requires 16 byte alignment
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: trippels at gcc dot gnu.org
CC: wschmidt at gcc dot gnu.org
Blocks: 63426
Host: powerpc64le-unknown-linux-gnu
Target: powerpc64le-unknown-linux-gnu
Build: powerpc64le-unknown-linux-gnu
Starting with r215873 I get many "load of misaligned address" runtime errors
in lex.c:552:30 during --with-build-config=bootstrap-ubsan:
../../gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address
0x01001f31d37a for type 'const uchar', which requires 16 byte alignment
0x01001f31d37a: note: pointer points here
6e 63 2e 0a 20 20 20 54 68 69 73 20 66 69 6c 65 20 69 73 20 70 61 72 74 20
6f 66 20 74 68 65 20
^
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/65261] [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment
2015-03-01 11:44 [Bug target/65261] New: [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment trippels at gcc dot gnu.org
@ 2015-03-01 12:12 ` trippels at gcc dot gnu.org
2015-03-02 9:02 ` rguenth at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: trippels at gcc dot gnu.org @ 2015-03-01 12:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65261
--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Maybe just adding __attribute__ ((no_sanitize_undefined)) to the function
is the right solution it this case?
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/65261] [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment
2015-03-01 11:44 [Bug target/65261] New: [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment trippels at gcc dot gnu.org
2015-03-01 12:12 ` [Bug target/65261] " trippels at gcc dot gnu.org
@ 2015-03-02 9:02 ` rguenth at gcc dot gnu.org
2015-03-02 16:37 ` wschmidt at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: rguenth at gcc dot gnu.org @ 2015-03-02 9:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65261
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |5.0
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/65261] [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment
2015-03-01 11:44 [Bug target/65261] New: [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment trippels at gcc dot gnu.org
2015-03-01 12:12 ` [Bug target/65261] " trippels at gcc dot gnu.org
2015-03-02 9:02 ` rguenth at gcc dot gnu.org
@ 2015-03-02 16:37 ` wschmidt at gcc dot gnu.org
2015-03-04 17:29 ` trippels at gcc dot gnu.org
2015-03-04 17:33 ` trippels at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: wschmidt at gcc dot gnu.org @ 2015-03-02 16:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65261
--- Comment #2 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Markus, yes, if adding that attribute clears up the messages for you, then I
would agree with that solution. The code is working as designed, as use of
unaligned vector loads and stores on POWER8 is preferable to the
forced-alignment solution. Could you please verify and submit a patch?
Thanks,
Bill
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/65261] [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment
2015-03-01 11:44 [Bug target/65261] New: [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment trippels at gcc dot gnu.org
` (2 preceding siblings ...)
2015-03-02 16:37 ` wschmidt at gcc dot gnu.org
@ 2015-03-04 17:29 ` trippels at gcc dot gnu.org
2015-03-04 17:33 ` trippels at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: trippels at gcc dot gnu.org @ 2015-03-04 17:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65261
--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Author: trippels
Date: Wed Mar 4 17:28:56 2015
New Revision: 221190
URL: https://gcc.gnu.org/viewcvs?rev=221190&root=gcc&view=rev
Log:
Fix PR65261
Running bootstrap-ubsan on ppc64le shows many instances of:
libcpp/lex.c:552:30: runtime error: load of misaligned address
0x01001f31d37a for type 'const uchar', which requires 16 byte alignment
But the unaligned vector loads are intended in this case, because they
are preferable to forced-alignment on POWER8. So just silence the ubsan
errors.
2015-03-02 Markus Trippelsdorf <markus@trippelsdorf.de>
include/
PR target/65261
* ansidecl.h (ATTRIBUTE_NO_SANITIZE_UNDEFINED): New macro.
libcpp/
PR target/65261
* lex.c (search_line_fast): Silence ubsan errors.
Modified:
trunk/include/ChangeLog
trunk/include/ansidecl.h
trunk/libcpp/ChangeLog
trunk/libcpp/lex.c
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug target/65261] [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment
2015-03-01 11:44 [Bug target/65261] New: [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment trippels at gcc dot gnu.org
` (3 preceding siblings ...)
2015-03-04 17:29 ` trippels at gcc dot gnu.org
@ 2015-03-04 17:33 ` trippels at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: trippels at gcc dot gnu.org @ 2015-03-04 17:33 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65261
Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
fixed.
^ permalink raw reply [flat|nested] 6+ messages in thread
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2015-03-01 11:44 [Bug target/65261] New: [5 Regression] bootstrap-ubsan ppc64le: gcc/libcpp/lex.c:552:30: runtime error: load of misaligned address 0x01002172dfc6 for type 'const uchar', which requires 16 byte alignment trippels at gcc dot gnu.org
2015-03-01 12:12 ` [Bug target/65261] " trippels at gcc dot gnu.org
2015-03-02 9:02 ` rguenth at gcc dot gnu.org
2015-03-02 16:37 ` wschmidt at gcc dot gnu.org
2015-03-04 17:29 ` trippels at gcc dot gnu.org
2015-03-04 17:33 ` trippels at gcc dot gnu.org
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