[Bug target/82851] New: [8 regression] g++.dg/vect/slp-pr56812.cc, i386/avx2-vpaddq-3.c, i386/avx2-vpsubq-3.c fails

["andrey.y.guskov at intel dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82851

            Bug ID: 82851
           Summary: [8 regression] g++.dg/vect/slp-pr56812.cc,
                    i386/avx2-vpaddq-3.c, i386/avx2-vpsubq-3.c fails
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: andrey.y.guskov at intel dot com
  Target Milestone: ---

r253975 triggers these fails:

spawn -ignore SIGHUP /work/gcc/testsuite/g++6/../../xg++
-B/work/gcc/testsuite/g++6/../../
/source/gcc/testsuite/g++.dg/vect/slp-pr56812.cc -fno-diagnostics-show-caret
-fdiagnostics-color=never -nostdinc++
-I/work/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-I/work/x86_64-pc-linux-gnu/libstdc++-v3/include
-I/source/libstdc++-v3/libsupc++ -I/source/libstdc++-v3/include/backward
-I/source/libstdc++-v3/testsuite/util -fmessage-length=0 -std=c++98 -O2
-ftree-vectorize -fno-vect-cost-model -msse2 -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 (found 0 times)

---
spawn -ignore SIGHUP /work/gcc/xgcc -B/work/gcc/
/source/gcc/testsuite/gcc.target/i386/avx2-vpaddq-3.c
-B/work/x86_64-pc-linux-gnu/./libmpx/
-B/work/x86_64-pc-linux-gnu/./libmpx/mpxrt
-L/work/x86_64-pc-linux-gnu/./libmpx/mpxrt/.libs
-B/work/x86_64-pc-linux-gnu/./libmpx/
-B/work/x86_64-pc-linux-gnu/./libmpx/mpxwrap
-L/work/x86_64-pc-linux-gnu/./libmpx/mpxwrap/.libs -fno-diagnostics-show-caret
-fdiagnostics-color=never -mavx2 -mno-prefer-avx128 -O2 -ftree-vectorize
-save-temps -ffat-lto-objects -lm -o ./avx2-vpaddq-3.exe
PASS: gcc.target/i386/avx2-vpaddq-3.c (test for excess errors)
PASS: gcc.target/i386/avx2-vpaddq-3.c execution test
FAIL: gcc.target/i386/avx2-vpaddq-3.c scan-assembler-times vpaddq[
\\t]+[^\n]*%ymm[0-9] 1 (found 0 times)

---
spawn -ignore SIGHUP /work/gcc/xgcc -B/work/gcc/
/source/gcc/testsuite/gcc.target/i386/avx2-vpsubq-3.c
-B/work/x86_64-pc-linux-gnu/./libmpx/
-B/work/x86_64-pc-linux-gnu/./libmpx/mpxrt
-L/work/x86_64-pc-linux-gnu/./libmpx/mpxrt/.libs
-B/work/x86_64-pc-linux-gnu/./libmpx/
-B/work/x86_64-pc-linux-gnu/./libmpx/mpxwrap
-L/work/x86_64-pc-linux-gnu/./libmpx/mpxwrap/.libs -fno-diagnostics-show-caret
-fdiagnostics-color=never -mavx2 -mno-prefer-avx128 -O2 -ftree-vectorize
-save-temps -ffat-lto-objects -lm -o ./avx2-vpsubq-3.exe
PASS: gcc.target/i386/avx2-vpsubq-3.c (test for excess errors)
PASS: gcc.target/i386/avx2-vpsubq-3.c execution test
FAIL: gcc.target/i386/avx2-vpsubq-3.c scan-assembler-times vpsubq[
\\t]+[^\n]*%ymm[0-9] 1 (found 0 times)


Option set:
-with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-shared
--enable-host-shared --enable-clocale=gnu --enable-cloog-backend=isl
--enable-languages=c,c++,fortran,jit,lto -with-arch=slm --with-cpu=slm