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* [Bug c/53416] New: 4.7.0 Wrong code when optimising loop involving _rdrand32_step @ 2012-05-19 17:15 marcel.kyas@fu-berlin.de 2012-05-20 17:48 ` [Bug target/53416] " hjl.tools at gmail dot com ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: marcel.kyas@fu-berlin.de @ 2012-05-19 17:15 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53416 Bug #: 53416 Summary: 4.7.0 Wrong code when optimising loop involving _rdrand32_step Classification: Unclassified Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned@gcc.gnu.org ReportedBy: marcel.kyas@fu-berlin.de Created attachment 27440 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27440 Reduced test case The attached file prints different output depending whether it is compiled with -O0, -O1 or -O2 on gcc-Version 4.7.0 20120507 (Red Hat 4.7.0-5) (GCC). When the file is built with gcc -std=c99 -mrdrnd -O0 rngtest.i, it prints four different random numbers. If it is built with gcc -std=c99 -mrdrnd -O1 rngtest.i, it prints the same number four times. If it is built with gcc -std=c99 -mrdrnd -O2 rngtest.i, it prints the random number four times and prints the random number as the result of the call to _rdrand32_step. The last one is especially surprising, because _rdrand32_step should only return 0 or 1. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/53416] Wrong code when optimising loop involving _rdrand32_step 2012-05-19 17:15 [Bug c/53416] New: 4.7.0 Wrong code when optimising loop involving _rdrand32_step marcel.kyas@fu-berlin.de @ 2012-05-20 17:48 ` hjl.tools at gmail dot com 2012-05-20 18:22 ` hjl.tools at gmail dot com ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: hjl.tools at gmail dot com @ 2012-05-20 17:48 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53416 H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- URL| |http://gcc.gnu.org/ml/gcc-p | |atches/2012-05/msg01338.htm | |l --- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2012-05-20 17:05:40 UTC --- A patch is posted at http://gcc.gnu.org/ml/gcc-patches/2012-05/msg01338.html ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/53416] Wrong code when optimising loop involving _rdrand32_step 2012-05-19 17:15 [Bug c/53416] New: 4.7.0 Wrong code when optimising loop involving _rdrand32_step marcel.kyas@fu-berlin.de 2012-05-20 17:48 ` [Bug target/53416] " hjl.tools at gmail dot com @ 2012-05-20 18:22 ` hjl.tools at gmail dot com 2012-05-21 12:41 ` hjl at gcc dot gnu.org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: hjl.tools at gmail dot com @ 2012-05-20 18:22 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53416 H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2012-05-20 Target Milestone|--- |4.6.4 Summary|4.7.0 Wrong code when |Wrong code when optimising |optimising loop involving |loop involving |_rdrand32_step |_rdrand32_step Ever Confirmed|0 |1 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/53416] Wrong code when optimising loop involving _rdrand32_step 2012-05-19 17:15 [Bug c/53416] New: 4.7.0 Wrong code when optimising loop involving _rdrand32_step marcel.kyas@fu-berlin.de 2012-05-20 17:48 ` [Bug target/53416] " hjl.tools at gmail dot com 2012-05-20 18:22 ` hjl.tools at gmail dot com @ 2012-05-21 12:41 ` hjl at gcc dot gnu.org 2012-05-21 13:07 ` hjl at gcc dot gnu.org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: hjl at gcc dot gnu.org @ 2012-05-21 12:41 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53416 --- Comment #2 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> 2012-05-21 12:32:04 UTC --- Author: hjl Date: Mon May 21 12:31:45 2012 New Revision: 187709 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=187709 Log: Use unspec_volatile on rdrand<mode>_1 gcc/ PR target/53416 * config/i386/i386.md (UNSPEC_RDRAND): Renamed to ... (UNSPECV_RDRAND): This. (rdrand<mode>_1): Updated. gcc/testsuite/ PR target/53416 * gcc.target/i386/pr53416.c: New file. Added: trunk/gcc/testsuite/gcc.target/i386/pr53416.c Modified: trunk/gcc/ChangeLog trunk/gcc/config/i386/i386.md trunk/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/53416] Wrong code when optimising loop involving _rdrand32_step 2012-05-19 17:15 [Bug c/53416] New: 4.7.0 Wrong code when optimising loop involving _rdrand32_step marcel.kyas@fu-berlin.de ` (2 preceding siblings ...) 2012-05-21 12:41 ` hjl at gcc dot gnu.org @ 2012-05-21 13:07 ` hjl at gcc dot gnu.org 2012-05-21 13:09 ` hjl at gcc dot gnu.org 2012-05-21 13:10 ` hjl.tools at gmail dot com 5 siblings, 0 replies; 7+ messages in thread From: hjl at gcc dot gnu.org @ 2012-05-21 13:07 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53416 --- Comment #3 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> 2012-05-21 12:59:58 UTC --- Author: hjl Date: Mon May 21 12:59:53 2012 New Revision: 187712 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=187712 Log: Use unspec_volatile on rdrand<mode>_1 gcc/ Backport from mainline PR target/53416 * config/i386/i386.md (UNSPEC_RDRAND): Renamed to ... (UNSPECV_RDRAND): This. (rdrand<mode>_1): Updated. gcc/testsuite/ Backport from mainline PR target/53416 * gcc.target/i386/pr53416.c: New file. Added: branches/gcc-4_6-branch/gcc/testsuite/gcc.target/i386/pr53416.c Modified: branches/gcc-4_6-branch/gcc/ChangeLog branches/gcc-4_6-branch/gcc/config/i386/i386.md branches/gcc-4_6-branch/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/53416] Wrong code when optimising loop involving _rdrand32_step 2012-05-19 17:15 [Bug c/53416] New: 4.7.0 Wrong code when optimising loop involving _rdrand32_step marcel.kyas@fu-berlin.de ` (3 preceding siblings ...) 2012-05-21 13:07 ` hjl at gcc dot gnu.org @ 2012-05-21 13:09 ` hjl at gcc dot gnu.org 2012-05-21 13:10 ` hjl.tools at gmail dot com 5 siblings, 0 replies; 7+ messages in thread From: hjl at gcc dot gnu.org @ 2012-05-21 13:09 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53416 --- Comment #4 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> 2012-05-21 13:07:16 UTC --- Author: hjl Date: Mon May 21 13:07:11 2012 New Revision: 187713 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=187713 Log: Use unspec_volatile on rdrand<mode>_1 gcc/ Backport from mainline PR target/53416 * config/i386/i386.md (UNSPEC_RDRAND): Renamed to ... (UNSPECV_RDRAND): This. (rdrand<mode>_1): Updated. gcc/testsuite/ Backport from mainline PR target/53416 * gcc.target/i386/pr53416.c: New file. Added: branches/gcc-4_7-branch/gcc/testsuite/gcc.target/i386/pr53416.c Modified: branches/gcc-4_7-branch/gcc/ChangeLog branches/gcc-4_7-branch/gcc/config/i386/i386.md branches/gcc-4_7-branch/gcc/testsuite/ChangeLog ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug target/53416] Wrong code when optimising loop involving _rdrand32_step 2012-05-19 17:15 [Bug c/53416] New: 4.7.0 Wrong code when optimising loop involving _rdrand32_step marcel.kyas@fu-berlin.de ` (4 preceding siblings ...) 2012-05-21 13:09 ` hjl at gcc dot gnu.org @ 2012-05-21 13:10 ` hjl.tools at gmail dot com 5 siblings, 0 replies; 7+ messages in thread From: hjl.tools at gmail dot com @ 2012-05-21 13:10 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53416 H.J. Lu <hjl.tools at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |FIXED --- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> 2012-05-21 13:08:53 UTC --- Fixed. ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2012-05-21 13:09 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2012-05-19 17:15 [Bug c/53416] New: 4.7.0 Wrong code when optimising loop involving _rdrand32_step marcel.kyas@fu-berlin.de 2012-05-20 17:48 ` [Bug target/53416] " hjl.tools at gmail dot com 2012-05-20 18:22 ` hjl.tools at gmail dot com 2012-05-21 12:41 ` hjl at gcc dot gnu.org 2012-05-21 13:07 ` hjl at gcc dot gnu.org 2012-05-21 13:09 ` hjl at gcc dot gnu.org 2012-05-21 13:10 ` hjl.tools at gmail dot com
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