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From: "wouter.vermaelen at scarlet dot be" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug 45764] (tree-optimization) New: wrong code -O2 vs -O3 (problem in vectorizer???)
Date: Thu, 23 Sep 2010 22:03:00 -0000 [thread overview]
Message-ID: <bug-45764-4@http.gcc.gnu.org/bugzilla/> (raw)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45764
Summary: wrong code -O2 vs -O3 (problem in vectorizer???)
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: wouter.vermaelen@scarlet.be
> cat bug.cc
int result[64][16];
int main()
{
double dbuf[1000] = {0.0};
int ibuf[900];
double d1 = 0.0;
double d2 = 0.0;
for (int i = 0; i < 900; ++i) {
ibuf[i] = int(d2 - d1);
d1 += dbuf[i];
d2 += dbuf[i + 64];
}
for (int i = 0; i < 64; ++i) {
for (int j = 0; j < 8; ++j) {
result[i][ j] = ibuf[64 - i + 64 * j];
result[i][15 - j] = ibuf[ i + 64 * j];
}
}
}
> g++ -O2 bug.cc
> ./a.out
> g++ -O3 bug.cc
> ./a.out
Segmentation fault (core dumped)
I'm using SVN revision 164570 on linux_x86_64.
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next reply other threads:[~2010-09-23 22:03 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-23 22:03 wouter.vermaelen at scarlet dot be [this message]
2010-09-23 22:20 ` [Bug 45764] (tree-optimization) " pinskia at gcc dot gnu.org
2010-09-24 4:49 ` hjl.tools at gmail dot com
2010-09-24 14:06 ` [Bug tree-optimization/45764] [4.6 Regression] " matz at gcc dot gnu.org
2010-09-24 14:37 ` rguenth at gcc dot gnu.org
2010-09-24 16:14 ` matz at gcc dot gnu.org
2010-09-30 11:05 ` rguenth at gcc dot gnu.org
2010-10-14 10:19 ` rguenth at gcc dot gnu.org
2010-10-14 11:55 ` rguenth at gcc dot gnu.org
2010-10-21 10:01 ` rguenth at gcc dot gnu.org
2010-10-21 11:11 ` rguenth at gcc dot gnu.org
2010-10-21 11:11 ` rguenth at gcc dot gnu.org
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