https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69463
Bug ID: 69463
Summary: wrong code with -O1 and vector arithmetics @ x86_64
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-*
Created attachment 37457
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37457&action=edit
reduced testcase
Maybe related to PR69459.
This testcase is failing for all versions that are able to compile it
(gcc-4_9-branch needs -O2 to reproduce).
Fails only for x86_64-pc-linux-gnu*. i686-* might fail as well with proper
-march= switch.
aarch64-*, armv7a-*, powerpc-*, powerpc64-*, sparc-*, sparc64-* do not fail at
any -On level.
Output:
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-232760-checking-yes-rtl-df-nographite/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-checking=yes,rtl,df --without-cloog --without-ppl --without-isl
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-232760-checking-yes-rtl-df-nographite
Thread model: posix
gcc version 6.0.0 20160123 (experimental) (GCC)
$ x86_64-pc-linux-gnu-gcc -O testcase.c
$ ./a.out
0000000100000107 ffffffff00000001
Aborted
Tested revisions:
trunk r232760 - FAIL
5-branch r232545 - FAIL
4_9-branch r232544 - OK @ -O1, FAIL @ -O2
4_[87]-branch - FAIL
