[llvm-bugs] [Bug 26658] New: Clang confuses backend... somehow.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26658

            Bug ID: 26658
           Summary: Clang confuses backend... somehow.
           Product: clang
           Version: 3.7
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: chriskitching at linux.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15918
  --> https://llvm.org/bugs/attachment.cgi?id=15918&action=edit
Reduced testcase

Process the given file like so:

"/usr/bin/clang-3.7" "-cc1" -save-temps "-triple" "x86_64-unknown-linux-gnu"
"-emit-obj" "-disable-free" "-disable-llvm-verifier" "-main-file-name"
"FeaturePyramid.cpp" "-mrelocation-model" "pic" "-pic-level" "2"
"-mthread-model" "posix" "-fmath-errno" "-fno-signed-zeros" "-freciprocal-math"
"-masm-verbose" "-mconstructor-aliases" "-munwind-tables" "-fuse-init-array"
"-target-cpu" "x86-64" "-momit-leaf-frame-pointer" "-g" "-dwarf-column-info"
"-D" "ENABLE_DBG_ASSERTIONS" "-D" "c3_EXPORTS" "-D" "SENTRY" "-D" "NDEBUG"
"-O3" "-Wall" "-Wpedantic" "-Wextra" "-Wno-sign-compare" "-Wall" "-Wpedantic"
"-Wextra" "-Wno-sign-compare" "-Wall" "-Wpedantic" "-Wextra"
"-Wno-sign-compare" "-std=c++11" "-fdeprecated-macro" "-ferror-limit" "19"
"-fmessage-length" "142" "-mstackrealign" "-fobjc-runtime=gcc"
"-fcxx-exceptions" "-fexceptions" "-fdiagnostics-show-option"
"-fcolor-diagnostics" "-vectorize-loops" "-vectorize-slp"
"-vectorize-slp-aggressive" "-x" "c++" "FeaturePyramid-827290.cpp"


Produces:

fatal error: error in backend: Cannot select: 0x3134990: i32 = any_extend
0x3135be8 [ORD=71] [ID=74]FeaturePyramid-827290.cpp:30:11
  0x3135be8: i64 = extract_vector_elt 0x31323a8, 0x3101948 [ORD=71]
[ID=71]FeaturePyramid-827290.cpp:30:11
    0x31323a8: v2i64 = bitcast 0x3102160 [ORD=71]
[ID=67]FeaturePyramid-827290.cpp:30:11
      0x3102160: v4i32 = X86ISD::PSHUFD 0x31372e8, 0x31343c8 [ORD=71]
[ID=63]FeaturePyramid-827290.cpp:30:11
        0x31372e8: v4i32 = X86ISD::PSHUFD 0x3132280, 0x3133858 [ORD=71]
[ID=59]FeaturePyramid-827290.cpp:30:11
          0x3132280: v4i32 = X86ISD::CMPP 0x312f020, 0x3134d08, 0x3133f48
[ORD=71] [ID=55]FeaturePyramid-827290.cpp:30:11
            0x312f020: v4f32 = fsub 0x3128058, 0x31274c8 [ORD=62]
[ID=51]FeaturePyramid-827290.cpp:20:15
              0x3128058: v4f32 = fsub 0x3127f30, 0x31274c8 [ORD=57]
[ID=48]FeaturePyramid-827290.cpp:20:15
                0x3127f30: v4f32 = fsub 0x3132bc0, 0x31274c8 [ORD=52]
[ID=45]FeaturePyramid-827290.cpp:20:15
                  0x3132bc0: v4f32 = X86ISD::UNPCKL 0x312e240, 0x312e5b8
[ORD=51] [ID=40]


                  0x31274c8: v4f32 = undef [ID=14]
                0x31274c8: v4f32 = undef [ID=14]
              0x31274c8: v4f32 = undef [ID=14]
            0x3134d08: v4f32 = bitcast 0x3131710 [ORD=74] [ID=41]
              0x3131710: v4i32 = BUILD_VECTOR 0x3131f28, 0x3131f28, 0x3131f28,
0x3131f28 [ORD=74] [ID=36]
                0x3131f28: i32 = Constant<0> [ID=26]
                0x3131f28: i32 = Constant<0> [ID=26]
                0x3131f28: i32 = Constant<0> [ID=26]
                0x3131f28: i32 = Constant<0> [ID=26]
            0x3133f48: i8 = Constant<4> [ID=17]FeaturePyramid-827290.cpp:30:11
          0x3133858: i8 = Constant<-44> [ID=24]FeaturePyramid-827290.cpp:30:11
        0x31343c8: i8 = Constant<78> [ID=30]FeaturePyramid-827290.cpp:30:11
    0x3101948: i64 = Constant<0> [ID=8]
In function: _Z19resizeBilinearFloatI3VecIfLm3EEEv3MatIT_E

Apologies for the lack of much in the way of actual investigation.

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