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* [Bug tree-optimization/57877] New: wrong code at -Os on x86_64-linux-gnu in 32-bit mode
@ 2013-07-10 18:01 su at cs dot ucdavis.edu
2013-08-27 9:28 ` [Bug rtl-optimization/57877] " jakub at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: su at cs dot ucdavis.edu @ 2013-07-10 18:01 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57877
Bug ID: 57877
Summary: wrong code at -Os on x86_64-linux-gnu in 32-bit mode
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
The current gcc trunk mis-compiles the following code on x86_64-linux at -Os in
32-bit mode. This is a regression from 4.8.x.
$ gcc-trunk -v
gcc version 4.9.0 20130710 (experimental) [trunk revision 200864] (GCC)
$
$ gcc-trunk -m32 -Os small.c
$ a.out
0
$ gcc-trunk -m32 -O3 small.c
$ a.out
1
$ gcc-4.8 -m32 -Os small.c
$ a.out
1
$
-----------------------------------------------------
int printf (const char *, ...);
int a, b, *c = &b, e, f = 6, g, h;
short d;
static unsigned char
foo (unsigned long long p1, int *p2)
{
for (; g <= 0; g++)
{
short *i = &d;
int *j = &e;
h = *c;
*i = h;
*j = (*i == *p2) < p1;
}
return 0;
}
int
main ()
{
foo (f, &a);
printf ("%d\n", e);
return 0;
}
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug rtl-optimization/57877] wrong code at -Os on x86_64-linux-gnu in 32-bit mode
2013-07-10 18:01 [Bug tree-optimization/57877] New: wrong code at -Os on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
@ 2013-08-27 9:28 ` jakub at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: jakub at gcc dot gnu.org @ 2013-08-27 9:28 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57877
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Tue Aug 27 09:24:52 2013
New Revision: 202018
URL: http://gcc.gnu.org/viewcvs?rev=202018&root=gcc&view=rev
Log:
PR rtl-optimization/57860
PR rtl-optimization/57861
PR rtl-optimization/57875
PR rtl-optimization/57876
PR rtl-optimization/57877
* gcc.c-torture/execute/pr57860.c: New test.
* gcc.c-torture/execute/pr57861.c: New test.
* gcc.c-torture/execute/pr57875.c: New test.
* gcc.c-torture/execute/pr57876.c: New test.
* gcc.c-torture/execute/pr57877.c: New test.
Added:
trunk/gcc/testsuite/gcc.c-torture/execute/pr57860.c
trunk/gcc/testsuite/gcc.c-torture/execute/pr57861.c
trunk/gcc/testsuite/gcc.c-torture/execute/pr57875.c
trunk/gcc/testsuite/gcc.c-torture/execute/pr57876.c
trunk/gcc/testsuite/gcc.c-torture/execute/pr57877.c
Modified:
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-07-10 18:01 [Bug tree-optimization/57877] New: wrong code at -Os on x86_64-linux-gnu in 32-bit mode su at cs dot ucdavis.edu
2013-08-27 9:28 ` [Bug rtl-optimization/57877] " jakub at gcc dot gnu.org
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