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* [Bug c/21297] New: buf[i+i]=0 stores buf[i] when -O2
@ 2005-04-30 15:54 akr at m17n dot org
2005-04-30 16:00 ` [Bug middle-end/21297] [4.0/4.1 Regression] " pinskia at gcc dot gnu dot org
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: akr at m17n dot org @ 2005-04-30 15:54 UTC (permalink / raw)
To: gcc-bugs
gcc 4.0.0 optimization seems to have a problem.
In the f function in following source, buf[i+i] = '\0' stores '\0' to buf[2].
But it should store to buf[4].
% cat t.c
extern int printf (__const char *__restrict __format, ...);
void
f(char *buf)
{
int i;
for (i = 0; i < 2; i++) ;
printf("i=%d\n", i);
buf[i+i] = '\0';
}
int main(int argc, char **argv)
{
char buf[] = "0123456789";
f(buf);
printf("%s\n", buf);
return 0;
}
% gcc -v -O2 t.c
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.0.0/configure --prefix=/home/src/gcc
Thread model: posix
gcc version 4.0.0
/home/src/gcc/libexec/gcc/i686-pc-linux-gnu/4.0.0/cc1 -quiet -v t.c -quiet
-dumpbase t.c -mtune=pentiumpro -auxbase t -O2 -version -o /tmp/ccKF4bLU.s
ignoring nonexistent directory
"/home/src/gcc/lib/gcc/i686-pc-linux-gnu/4.0.0/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/local/include
/home/src/gcc/include
/home/src/gcc/lib/gcc/i686-pc-linux-gnu/4.0.0/include
/usr/include
End of search list.
GNU C version 4.0.0 (i686-pc-linux-gnu)
compiled by GNU C version 4.0.0.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
as -V -Qy -o /tmp/ccm6JTQG.o /tmp/ccKF4bLU.s
GNU assembler version 2.15 (i386-linux) using BFD version 2.15
/home/src/gcc/libexec/gcc/i686-pc-linux-gnu/4.0.0/collect2 --eh-frame-hdr -m
elf_i386 -dynamic-linker /lib/ld-linux.so.2 /usr/lib/crt1.o /usr/lib/crti.o
/home/src/gcc/lib/gcc/i686-pc-linux-gnu/4.0.0/crtbegin.o
-L/home/src/gcc/lib/gcc/i686-pc-linux-gnu/4.0.0
-L/home/src/gcc/lib/gcc/i686-pc-linux-gnu/4.0.0/../../.. /tmp/ccm6JTQG.o -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/home/src/gcc/lib/gcc/i686-pc-linux-gnu/4.0.0/crtend.o /usr/lib/crtn.o
% ./a.out
i=2
01
The binary produces "01". But it should be "0123".
If gcc 3.3.5 is used, the binary produces "0123".
--
Summary: buf[i+i]=0 stores buf[i] when -O2
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: akr at m17n dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21297
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug middle-end/21297] [4.0/4.1 Regression] buf[i+i]=0 stores buf[i] when -O2
2005-04-30 15:54 [Bug c/21297] New: buf[i+i]=0 stores buf[i] when -O2 akr at m17n dot org
@ 2005-04-30 16:00 ` pinskia at gcc dot gnu dot org
2005-05-02 13:04 ` [Bug target/21297] " jakub at gcc dot gnu dot org
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2005-04-30 16:00 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-04-30 16:00 -------
This is another expand issue:
;; *((char *) (unsigned int) (i + i) + buf) = 0
(insn 27 25 0 (set (mem:QI (plus:SI (mult:SI (reg/v:SI 60 [ i ])
(const_int 1 [0x1]))
(reg/v/f:SI 61 [ buf ])) [0 S1 A8])
(const_int 0 [0x0])) -1 (nil)
(nil))
Why is it multiplying by one and not by two.
Confirmed.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Component|c |middle-end
Ever Confirmed| |1
Keywords| |wrong-code
Last reconfirmed|0000-00-00 00:00:00 |2005-04-30 16:00:20
date| |
Summary|buf[i+i]=0 stores buf[i] |[4.0/4.1 Regression]
|when -O2 |buf[i+i]=0 stores buf[i]
| |when -O2
Target Milestone|--- |4.0.1
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21297
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/21297] [4.0/4.1 Regression] buf[i+i]=0 stores buf[i] when -O2
2005-04-30 15:54 [Bug c/21297] New: buf[i+i]=0 stores buf[i] when -O2 akr at m17n dot org
2005-04-30 16:00 ` [Bug middle-end/21297] [4.0/4.1 Regression] " pinskia at gcc dot gnu dot org
@ 2005-05-02 13:04 ` jakub at gcc dot gnu dot org
2005-05-02 13:42 ` jakub at gcc dot gnu dot org
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: jakub at gcc dot gnu dot org @ 2005-05-02 13:04 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From jakub at gcc dot gnu dot org 2005-05-02 13:04 -------
This is a target bug.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |jakub at gcc dot gnu dot org
|dot org |
Status|NEW |ASSIGNED
Component|middle-end |target
Last reconfirmed|2005-04-30 16:00:20 |2005-05-02 13:04:19
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21297
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/21297] [4.0/4.1 Regression] buf[i+i]=0 stores buf[i] when -O2
2005-04-30 15:54 [Bug c/21297] New: buf[i+i]=0 stores buf[i] when -O2 akr at m17n dot org
2005-04-30 16:00 ` [Bug middle-end/21297] [4.0/4.1 Regression] " pinskia at gcc dot gnu dot org
2005-05-02 13:04 ` [Bug target/21297] " jakub at gcc dot gnu dot org
@ 2005-05-02 13:42 ` jakub at gcc dot gnu dot org
2005-05-03 13:04 ` cvs-commit at gcc dot gnu dot org
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: jakub at gcc dot gnu dot org @ 2005-05-02 13:42 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From jakub at gcc dot gnu dot org 2005-05-02 13:42 -------
Patch here: <http://gcc.gnu.org/ml/gcc-patches/2005-05/msg00073.html>
--
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21297
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/21297] [4.0/4.1 Regression] buf[i+i]=0 stores buf[i] when -O2
2005-04-30 15:54 [Bug c/21297] New: buf[i+i]=0 stores buf[i] when -O2 akr at m17n dot org
` (2 preceding siblings ...)
2005-05-02 13:42 ` jakub at gcc dot gnu dot org
@ 2005-05-03 13:04 ` cvs-commit at gcc dot gnu dot org
2005-05-04 7:25 ` [Bug target/21297] [4.0 " cvs-commit at gcc dot gnu dot org
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-05-03 13:04 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-05-03 13:01 -------
Subject: Bug 21297
CVSROOT: /cvs/gcc
Module name: gcc
Changes by: jakub@gcc.gnu.org 2005-05-03 12:58:13
Modified files:
gcc : ChangeLog
gcc/config/i386: i386.c
gcc/testsuite : ChangeLog
Added files:
gcc/testsuite/gcc.c-torture/execute: 20050502-2.c
Log message:
PR target/21297
* config/i386/i386.c (legitimize_address): When canonicalizing
ASHIFT into MULT, multiply by 1 << shift_count instead of
1 << log2 (shift_count).
* gcc.c-torture/execute/20050502-2.c: New test.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.8572&r2=2.8573
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/i386/i386.c.diff?cvsroot=gcc&r1=1.816&r2=1.817
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.5433&r2=1.5434
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/20050502-2.c.diff?cvsroot=gcc&r1=NONE&r2=1.1
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21297
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/21297] [4.0 Regression] buf[i+i]=0 stores buf[i] when -O2
2005-04-30 15:54 [Bug c/21297] New: buf[i+i]=0 stores buf[i] when -O2 akr at m17n dot org
` (3 preceding siblings ...)
2005-05-03 13:04 ` cvs-commit at gcc dot gnu dot org
@ 2005-05-04 7:25 ` cvs-commit at gcc dot gnu dot org
2005-05-04 8:16 ` giovannibajo at libero dot it
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-05-04 7:25 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-05-04 07:24 -------
Subject: Bug 21297
CVSROOT: /cvs/gcc
Module name: gcc
Branch: gcc-4_0-branch
Changes by: jakub@gcc.gnu.org 2005-05-04 07:24:34
Modified files:
gcc : ChangeLog
gcc/testsuite : ChangeLog
gcc/config/i386: i386.c
Added files:
gcc/testsuite/gcc.c-torture/execute: 20050502-2.c
Log message:
PR target/21297
* config/i386/i386.c (legitimize_address): When canonicalizing
ASHIFT into MULT, multiply by 1 << shift_count instead of
1 << log2 (shift_count).
* gcc.c-torture/execute/20050502-2.c: New test.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=2.7592.2.214&r2=2.7592.2.215
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.5084.2.157&r2=1.5084.2.158
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/i386/i386.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=1.795.6.6&r2=1.795.6.7
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/20050502-2.c.diff?cvsroot=gcc&only_with_tag=gcc-4_0-branch&r1=NONE&r2=1.1.2.1
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21297
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/21297] [4.0 Regression] buf[i+i]=0 stores buf[i] when -O2
2005-04-30 15:54 [Bug c/21297] New: buf[i+i]=0 stores buf[i] when -O2 akr at m17n dot org
` (4 preceding siblings ...)
2005-05-04 7:25 ` [Bug target/21297] [4.0 " cvs-commit at gcc dot gnu dot org
@ 2005-05-04 8:16 ` giovannibajo at libero dot it
2005-05-26 17:54 ` cvs-commit at gcc dot gnu dot org
2005-05-29 16:03 ` cvs-commit at gcc dot gnu dot org
7 siblings, 0 replies; 9+ messages in thread
From: giovannibajo at libero dot it @ 2005-05-04 8:16 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From giovannibajo at libero dot it 2005-05-04 08:16 -------
Fixed!
--
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21297
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/21297] [4.0 Regression] buf[i+i]=0 stores buf[i] when -O2
2005-04-30 15:54 [Bug c/21297] New: buf[i+i]=0 stores buf[i] when -O2 akr at m17n dot org
` (5 preceding siblings ...)
2005-05-04 8:16 ` giovannibajo at libero dot it
@ 2005-05-26 17:54 ` cvs-commit at gcc dot gnu dot org
2005-05-29 16:03 ` cvs-commit at gcc dot gnu dot org
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-05-26 17:54 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-05-26 17:50 -------
Subject: Bug 21297
CVSROOT: /cvs/gcc
Module name: gcc
Branch: gcc-3_4-rhl-branch
Changes by: jakub@gcc.gnu.org 2005-05-26 17:49:50
Modified files:
gcc : ChangeLog
gcc/config/i386: i386.c
gcc/testsuite : ChangeLog
Added files:
gcc/testsuite/gcc.c-torture/execute: 20050502-2.c
Log message:
PR target/21297
* config/i386/i386.c (legitimize_address): When canonicalizing
ASHIFT into MULT, multiply by 1 << shift_count instead of
1 << log2 (shift_count).
* gcc.c-torture/execute/20050502-2.c: New test.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=2.2326.2.399.2.78&r2=2.2326.2.399.2.79
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/config/i386/i386.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=1.635.2.8.2.11&r2=1.635.2.8.2.12
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=1.3389.2.170.2.49&r2=1.3389.2.170.2.50
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.c-torture/execute/20050502-2.c.diff?cvsroot=gcc&only_with_tag=gcc-3_4-rhl-branch&r1=NONE&r2=1.1.8.1
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21297
^ permalink raw reply [flat|nested] 9+ messages in thread
* [Bug target/21297] [4.0 Regression] buf[i+i]=0 stores buf[i] when -O2
2005-04-30 15:54 [Bug c/21297] New: buf[i+i]=0 stores buf[i] when -O2 akr at m17n dot org
` (6 preceding siblings ...)
2005-05-26 17:54 ` cvs-commit at gcc dot gnu dot org
@ 2005-05-29 16:03 ` cvs-commit at gcc dot gnu dot org
7 siblings, 0 replies; 9+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2005-05-29 16:03 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2005-05-29 16:02 -------
Subject: Bug 21297
CVSROOT: /cvs/gcc
Module name: gcc
Changes by: pault@gcc.gnu.org 2005-05-29 16:02:11
Modified files:
gcc/fortran : trans-array.c trans-expr.c
Log message:
2005-05-29 Paul Thomas <pault@gcc.gnu.org>
PR fortran/16939
PR fortran/17192
PR fortran/17193
PR fortran/17202
PR fortran/18689
PR fortran/18890
PR fortran/21297
* fortran/trans-array.c (gfc_conv_resolve_dependencies): Add string
length to temp_ss for character pointer array assignments.
* fortran/trans-expr.c (gfc_conv_variable): Correct errors in
dereferencing of characters and character pointers.
* fortran/trans-expr.c (gfc_conv_function_call): Provide string
length as return argument for various kinds of handling of return.
Return a char[]* temporary for character pointer functions and
dereference the temporary upon return.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/fortran/trans-array.c.diff?cvsroot=gcc&r1=1.45&r2=1.46
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/fortran/trans-expr.c.diff?cvsroot=gcc&r1=1.44&r2=1.45
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21297
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2005-05-29 16:03 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-04-30 15:54 [Bug c/21297] New: buf[i+i]=0 stores buf[i] when -O2 akr at m17n dot org
2005-04-30 16:00 ` [Bug middle-end/21297] [4.0/4.1 Regression] " pinskia at gcc dot gnu dot org
2005-05-02 13:04 ` [Bug target/21297] " jakub at gcc dot gnu dot org
2005-05-02 13:42 ` jakub at gcc dot gnu dot org
2005-05-03 13:04 ` cvs-commit at gcc dot gnu dot org
2005-05-04 7:25 ` [Bug target/21297] [4.0 " cvs-commit at gcc dot gnu dot org
2005-05-04 8:16 ` giovannibajo at libero dot it
2005-05-26 17:54 ` cvs-commit at gcc dot gnu dot org
2005-05-29 16:03 ` cvs-commit at gcc dot gnu dot org
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