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* [Bug tree-optimization/60075] New: Wrong code from loop optimizer with address-space accesses
@ 2014-02-05 13:34 gjl at gcc dot gnu.org
2014-02-05 13:37 ` [Bug tree-optimization/60075] " gjl at gcc dot gnu.org
2023-12-05 12:35 ` rguenth at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: gjl at gcc dot gnu.org @ 2014-02-05 13:34 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60075
Bug ID: 60075
Summary: Wrong code from loop optimizer with address-space
accesses
Product: gcc
Version: 4.7.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gjl at gcc dot gnu.org
Created attachment 32046
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32046&action=edit
loop-memx.c: C source triggering the bug
The following C code runs to abort:
== C code ==
typedef unsigned char uint8_t;
volatile uint8_t buf[12];
volatile uint8_t buf_used;
void __attribute__((noinline,noclone))
copy_string (uint8_t len, const __memx char* str)
{
uint8_t n;
for (n = 0; n < len; n++)
{
if (*str != '1')
__builtin_abort();
buf[n] = *str++;
}
buf_used = len;
}
int main (void)
{
copy_string (1, "1");
return 0;
}
== Command Line ==
$ avr-gcc -mmcu=atmega128 loop-memx.c -O2 -v
== Configuration ==
It's from the current (2014-02-05) 4.7 head but the problem is also known for
official releases like 4.7.2
gcc version 4.7.4 20140205 (prerelease) [gcc-4_7-branch revision 195858] (GCC)
Target: avr
Configured with: ../../gcc.gnu.org/gcc-4_7-branch/configure --target=avr
--prefix=/local/gnu/install/gcc-4.7 --disable-nls --with-dwarf2
--enable-languages=c,c++ --enable-target-optspace=yes --with-avrlibc=yes
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/60075] Wrong code from loop optimizer with address-space accesses
2014-02-05 13:34 [Bug tree-optimization/60075] New: Wrong code from loop optimizer with address-space accesses gjl at gcc dot gnu.org
@ 2014-02-05 13:37 ` gjl at gcc dot gnu.org
2023-12-05 12:35 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: gjl at gcc dot gnu.org @ 2014-02-05 13:37 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60075
Georg-Johann Lay <gjl at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |addr-space, wrong-code
Target| |avr
Status|UNCONFIRMED |NEW
Last reconfirmed| |2014-02-05
Ever confirmed|0 |1
--- Comment #1 from Georg-Johann Lay <gjl at gcc dot gnu.org> ---
The code is correct of -fno-ivopts or -fno-tree-loop-optimize is added to the
command options.
Presumably, the problem is that the __memx address space uses a 24-bit mode
(PSImode) but sizetype is only 16 bits.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug tree-optimization/60075] Wrong code from loop optimizer with address-space accesses
2014-02-05 13:34 [Bug tree-optimization/60075] New: Wrong code from loop optimizer with address-space accesses gjl at gcc dot gnu.org
2014-02-05 13:37 ` [Bug tree-optimization/60075] " gjl at gcc dot gnu.org
@ 2023-12-05 12:35 ` rguenth at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-12-05 12:35 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60075
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2014-02-05 00:00:00 |2023-12-5
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Re-confirmed.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-02-05 13:34 [Bug tree-optimization/60075] New: Wrong code from loop optimizer with address-space accesses gjl at gcc dot gnu.org
2014-02-05 13:37 ` [Bug tree-optimization/60075] " gjl at gcc dot gnu.org
2023-12-05 12:35 ` rguenth at gcc dot gnu.org
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