http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49140
Summary: [4.6 regression] wrong code with -O2 and -O3, not with
-O3 -no-inline
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: tree-optimization
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: d...@ubuntu.com
Created attachment 24342
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24342
preprocessed source
[forwarded from http://bugs.debian.org/627084]
seen with r174102 from the 4.6 branch, works with r173903 from the trunk
Step to reproduce:
wget 'http://pari.math.u-bordeaux.fr/~bill/pari-2.4.3.12000.tar.gz'
tar xf pari-2.4.3.12000.tar.gz
cd pari-2.4.3.alpha
./Configure
make gp
make bench
Result: all test suite fail.
Cause:
The function pari_init_parser() in the file src/language/parsec.h is
miscompiled.
(This file is included by src/language/parse.y).
If you replace the line 43: s_node.n=OPnboperator; by parsestate_reset();
(which does the same thing), then all test pass.
It seems that the issue is that the function stack_alloc() is not inlined
correctly,
which cause pari_tree to be NULL (or maybe the call to pari_inline inside
stack_alloc()
is not inlined correctly.
The command line used is
gcc-4.6 -c -O3 -Wall -fno-strict-aliasing -fomit-frame-pointer -I.
-I../src/headers -fPIC -o
parse.o ../src/language/parse.c
It also happens with -O2, but not with -O3 -fno-inline.
It works fine with gcc 4.3, 4.4 and 4.5.
