Compilation warning in AVXVec.h

[makortel]

The CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300 on slc7_amd64_gcc10 is warning

>> Compiling skylake-avx512 /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/TrackingTools/AnalyticalJacobians/src/JacobianCurvilinearToCartesian.cc
/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/gcc/10.3.0-84898dea653199466402e67d73657f10/bin/c++ -c -DGNU_GCC -D_GNU_SOURCE -DEIGEN_DONT_PARALLELIZE -DTBB_USE_GLIBCXX_VERSION=100300 -DTBB_SUPPRESS_DEPRECATED_MESSAGES -DTBB_PREVIEW_RESUMABLE_TASKS=1 -DBOOST_SPIRIT_THREADSAFE -DPHOENIX_THREADSAFE -DBOOST_MATH_DISABLE_STD_FPCLASSIFY -DBOOST_UUID_RANDOM_PROVIDER_FORCE_POSIX -DCMSSW_GIT_HASH='CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300' -DPROJECT_NAME='CMSSW' -DPROJECT_VERSION='CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300' -I/data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/pcre/8.43-28d54724578a9006cf0dca75629374e3/include -isystem/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/boost/1.75.0-d92e5fa723d0ea2c498d4ee58b805800/include -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/bz2lib/1.0.6-86270889250d9cb8193d1963706a39cb/include -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/gsl/2.6-0c1d3dda375c5665ae354318ba49dd7e/include -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/libuuid/2.34-fe91b21b8e54a48f2d45894d9da65f14/include -isystem/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/lcg/root/6.22.08-7a23d8c39de64086964b1f85b2a999a5/include -isystem/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/tbb/v2021.4.0-948cf178e0e7563ed46ef2d4709d6819/include -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/cms/vdt/0.4.0-4992e31c0940a149574c0e867a49cc88/include -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/xz/5.2.5-d6fed2038c4e8d6e04531d1adba59f37/include -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/zlib/1.2.11-71514f01d2850dfd0bcd391557259a58/include -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/eigen/82dd3710dac619448f50331c1d6a35da673f764a-b8031725d6746d487cfe338415b1b618/include/eigen3 -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/fmt/8.0.1-6d217bf36b9a6ba22d9ebe84cf34a21a/include -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/md5/1.0.0-0440f43b57c5656322f7cd7a65f85771/include -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/OpenBLAS/0.3.15-cbb9880f108e4d44b0cc589a0d462d4c/include -I/data/cmsbld/jenkins/workspace/build-any-ib/w/slc7_amd64_gcc10/external/tinyxml2/6.2.0-e1d93814e04028ebad1832c681e0a52d/include -O2 -pthread -pipe -Werror=main -Werror=pointer-arith -Werror=overlength-strings -Wno-vla -Werror=overflow -std=c++1z -ftree-vectorize -Wstrict-overflow -Werror=array-bounds -Werror=format-contains-nul -Werror=type-limits -fvisibility-inlines-hidden -fno-math-errno --param vect-max-version-for-alias-checks=50 -Xassembler --compress-debug-sections -msse3 -felide-constructors -fmessage-length=0 -Wall -Wno-non-template-friend -Wno-long-long -Wreturn-type -Wextra -Wpessimizing-move -Wclass-memaccess -Wno-cast-function-type -Wno-unused-but-set-parameter -Wno-ignored-qualifiers -Wno-deprecated-copy -Wno-unused-parameter -Wunused -Wparentheses -Wno-deprecated -Werror=return-type -Werror=missing-braces -Werror=unused-value -Werror=unused-label -Werror=address -Werror=format -Werror=sign-compare -Werror=write-strings -Werror=delete-non-virtual-dtor -Werror=strict-aliasing -Werror=narrowing -Werror=unused-but-set-variable -Werror=reorder -Werror=unused-variable -Werror=conversion-null -Werror=return-local-addr -Wnon-virtual-dtor -Werror=switch -fdiagnostics-show-option -Wno-unused-local-typedefs -Wno-attributes -Wno-psabi -Wno-error=unused-variable -DBOOST_DISABLE_ASSERTS -march=skylake-avx512  -fPIC  -MMD -MF tmp/slc7_amd64_gcc10/src/TrackingTools/AnalyticalJacobians/src/TrackingToolsAnalyticalJacobians/skylake-avx512/JacobianCurvilinearToCartesian.cc.d /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/TrackingTools/AnalyticalJacobians/src/JacobianCurvilinearToCartesian.cc -o tmp/slc7_amd64_gcc10/src/TrackingTools/AnalyticalJacobians/src/TrackingToolsAnalyticalJacobians/skylake-avx512/JacobianCurvilinearToCartesian.cc.o
In file included from /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/DataFormats/Math/interface/SSEVec.h:385,
                 from /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/DataFormats/Math/interface/SIMDVec.h:57,
                 from /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/DataFormats/GeometryVector/interface/Basic3DVector.h:4,
                 from /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/DataFormats/GeometryVector/interface/PV3DBase.h:4,
                 from /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/DataFormats/GeometryVector/interface/Point3DBase.h:5,
                 from /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/DataFormats/GeometryVector/interface/GlobalPoint.h:5,
                 from /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/TrackingTools/AnalyticalJacobians/interface/AnalyticalCurvilinearJacobian.h:5,
                 from /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/TrackingTools/AnalyticalJacobians/src/AnalyticalCurvilinearJacobian.cc:1:
/data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/DataFormats/Math/interface/private/AVXVec.h: In constructor 'mathSSE::Vec4<double>::Vec4(mathSSE::Vec2<double>, mathSSE::Vec2<double>)':
  /data/cmsbld/jenkins/workspace/build-any-ib/w/tmp/BUILDROOT/6b912c9f967e64a2e24246c58bc10cc5/opt/cmssw/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/src/DataFormats/Math/interface/private/AVXVec.h:33:33: warning: '*<unknown>.mathSSE::Vec4<double>::vec' is used uninitialized in this function [-Wuninitialized]
    33 |       vec = _mm256_insertf128_pd(vec, ivec0.vec, 0);
      |             ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~

https://cmssdt.cern.ch/SDT/cgi-bin/buildlogs/slc7_amd64_gcc10/CMSSW_12_3_SKYLAKEAVX512_X_2021-12-16-2300/TrackingTools/AnalyticalJacobians

[cmsbuild]

A new Issue was created by @makortel Matti Kortelainen.

@Dr15Jones, @perrotta, @dpiparo, @makortel, @smuzaffar, @qliphy can you please review it and eventually sign/assign? Thanks.

cms-bot commands are listed here

[makortel]

assign reconstruction

FYI @VinInn

[cmsbuild]

New categories assigned: reconstruction

@slava77,@jpata,@clacaputo you have been requested to review this Pull request/Issue and eventually sign? Thanks

[makortel]

The warning is pointing to line 33 in this function

cmssw/DataFormats/Math/interface/private/AVXVec.h

Lines 32 to 35 in a9f4483

	Vec4(Vec2<double> ivec0, Vec2<double> ivec1) {
	vec = _mm256_insertf128_pd(vec, ivec0.vec, 0);
	vec = _mm256_insertf128_pd(vec, ivec1.vec, 1);
	}

[slava77]

in this context, it's a false positive. Whatever vec was before entering this method, the result will be ivec1.vec ivec0.vec.

[slava77]

perhaps it should just be replaced by _mm256_set_m128d(ivec1.vec, ivec0.vec);