User account creation filtered due to spam.

Bug 81038 - [8 regression] test case g++.dg/vect/slp-pr56812.cc fails starting with r248678
Summary: [8 regression] test case g++.dg/vect/slp-pr56812.cc fails starting with r248678
Status: UNCONFIRMED
Alias: None
Product: gcc
Classification: Unclassified
Component: tree-optimization (show other bugs)
Version: 8.0
: P3 normal
Target Milestone: 8.0
Assignee: Not yet assigned to anyone
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2017-06-09 15:32 UTC by seurer
Modified: 2017-06-12 08:04 UTC (History)
2 users (show)

See Also:
Host: powerpc*-*-*
Target: powerpc*-*-*
Build: powerpc*-*-*
Known to work:
Known to fail:
Last reconfirmed:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description seurer 2017-06-09 15:32:50 UTC 
This test case was failing recently (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80925) but starting working again.  Now it is failing once more.

spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-trunk/gcc/testsuite/g++2/../../xg++ -B/home/seurer/gcc/build/gcc-trunk/gcc/testsuite/g++2/../../ /home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/vect/slp-pr56812.cc -fno-diagnostics-show-caret -fdiagnostics-color=never -nostdinc++ -I/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/libstdc++-v3/include/powerpc64-unknown-linux-gnu -I/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/libstdc++-v3/include -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/libsupc++ -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/include/backward -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/testsuite/util -fmessage-length=0 -std=c++98 -O2 -ftree-vectorize -fno-vect-cost-model -maltivec -mpower8-vector -fdump-tree-slp-details -O3 -funroll-loops -fvect-cost-model=dynamic -S -o slp-pr56812.s
PASS: g++.dg/vect/slp-pr56812.cc  -std=c++98 (test for excess errors)
FAIL: g++.dg/vect/slp-pr56812.cc  -std=c++98  scan-tree-dump-times slp1 "basic block vectorized" 1
Executing on host: /home/seurer/gcc/build/gcc-trunk/gcc/testsuite/g++2/../../xg++ -B/home/seurer/gcc/build/gcc-trunk/gcc/testsuite/g++2/../../ /home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/vect/slp-pr56812.cc  -fno-diagnostics-show-caret -fdiagnostics-color=never  -nostdinc++ -I/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/libstdc++-v3/include/powerpc64-unknown-linux-gnu -I/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/libstdc++-v3/include -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/libsupc++ -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/include/backward -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/testsuite/util -fmessage-length=0  -std=c++11 -O2 -ftree-vectorize -fno-vect-cost-model -maltivec -mpower8-vector -fdump-tree-slp-details -O3 -funroll-loops -fvect-cost-model=dynamic  -S   -o slp-pr56812.s    (timeout = 300)
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-trunk/gcc/testsuite/g++2/../../xg++ -B/home/seurer/gcc/build/gcc-trunk/gcc/testsuite/g++2/../../ /home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/vect/slp-pr56812.cc -fno-diagnostics-show-caret -fdiagnostics-color=never -nostdinc++ -I/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/libstdc++-v3/include/powerpc64-unknown-linux-gnu -I/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/libstdc++-v3/include -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/libsupc++ -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/include/backward -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/testsuite/util -fmessage-length=0 -std=c++11 -O2 -ftree-vectorize -fno-vect-cost-model -maltivec -mpower8-vector -fdump-tree-slp-details -O3 -funroll-loops -fvect-cost-model=dynamic -S -o slp-pr56812.s
PASS: g++.dg/vect/slp-pr56812.cc  -std=c++11 (test for excess errors)
FAIL: g++.dg/vect/slp-pr56812.cc  -std=c++11  scan-tree-dump-times slp1 "basic block vectorized" 1
Executing on host: /home/seurer/gcc/build/gcc-trunk/gcc/testsuite/g++2/../../xg++ -B/home/seurer/gcc/build/gcc-trunk/gcc/testsuite/g++2/../../ /home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/vect/slp-pr56812.cc  -fno-diagnostics-show-caret -fdiagnostics-color=never  -nostdinc++ -I/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/libstdc++-v3/include/powerpc64-unknown-linux-gnu -I/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/libstdc++-v3/include -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/libsupc++ -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/include/backward -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/testsuite/util -fmessage-length=0  -std=c++14 -O2 -ftree-vectorize -fno-vect-cost-model -maltivec -mpower8-vector -fdump-tree-slp-details -O3 -funroll-loops -fvect-cost-model=dynamic  -S   -o slp-pr56812.s    (timeout = 300)
spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-trunk/gcc/testsuite/g++2/../../xg++ -B/home/seurer/gcc/build/gcc-trunk/gcc/testsuite/g++2/../../ /home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/vect/slp-pr56812.cc -fno-diagnostics-show-caret -fdiagnostics-color=never -nostdinc++ -I/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/libstdc++-v3/include/powerpc64-unknown-linux-gnu -I/home/seurer/gcc/build/gcc-trunk/powerpc64-unknown-linux-gnu/libstdc++-v3/include -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/libsupc++ -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/include/backward -I/home/seurer/gcc/gcc-trunk/libstdc++-v3/testsuite/util -fmessage-length=0 -std=c++14 -O2 -ftree-vectorize -fno-vect-cost-model -maltivec -mpower8-vector -fdump-tree-slp-details -O3 -funroll-loops -fvect-cost-model=dynamic -S -o slp-pr56812.s
PASS: g++.dg/vect/slp-pr56812.cc  -std=c++14 (test for excess errors)
FAIL: g++.dg/vect/slp-pr56812.cc  -std=c++14  scan-tree-dump-times slp1 "basic block vectorized" 1
testcase /home/seurer/gcc/gcc-trunk/gcc/testsuite/g++.dg/vect/vect.exp completed in 6 seconds
Comment 1 seurer 2017-06-09 15:33:55 UTC 
Note:  fails on powerpc64 both BE and LE.
Comment 2 Richard Biener 2017-06-12 08:04:27 UTC 
Eventually the loop is no longer unrolled (was it?) and is now loop vectorized?
(and that bit is "fragile" because of -fvect-cost-model=dynamic?)

Just guessing.