[Bug 238082] system clang 8 one powerpc64 head -r347549 based system: clang asserts with "Target supports vector op, but scalar requires expansion?" for graphics/mesa-dri build

Thu May 23 19:27:11 UTC 2019

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238082

            Bug ID: 238082
           Summary: system clang 8 one powerpc64 head -r347549 based
                    system: clang asserts with "Target supports vector op,
                    but scalar requires expansion?" for graphics/mesa-dri
                    build
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: marklmi26-fbsd at yahoo.com

Created attachment 204574
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=204574&action=edit
/tmp/nir_constant_expressions-9b094e.c from clang's saved failure information

[This is from the unusual context of a powerpc64 old PowerMac)
built with system clang 8 and base/binutils instead of gcc 4.2.1
based tooling.]

>From a poudriere bulk build in a powerpc64 context (old PowerMac)
that was built with and uses system clang 8 and base/binutils
instead of the gcc 4.2.1 toolchain. I got:

[09:05:56] [04] [00:14:42] Saved graphics/mesa-dri | mesa-dri-18.3.2_2 wrkdir
to:
/usr/local/poudriere/data/wrkdirs/FBSDpowerpc64-default/default/mesa-dri-18.3.2_2.tbz
[09:05:57] [04] [00:14:43] Finished graphics/mesa-dri | mesa-dri-18.3.2_2:
Failed: build
[09:05:59] [04] [00:14:45] Skipping x11-drivers/xf86-input-keyboard |
xf86-input-keyboard-1.9.0_3: Dependent port graphics/mesa-dri |
mesa-dri-18.3.2_2 failed
[09:05:59] [04] [00:14:45] Skipping x11-drivers/xf86-input-mouse |
xf86-input-mouse-1.9.3_2: Dependent port graphics/mesa-dri | mesa-dri-18.3.2_2
failed
[09:05:59] [04] [00:14:45] Skipping x11-drivers/xf86-video-scfb |
xf86-video-scfb-0.0.4_7: Dependent port graphics/mesa-dri | mesa-dri-18.3.2_2
failed
[09:05:59] [04] [00:14:45] Skipping x11-drivers/xf86-video-vesa |
xf86-video-vesa-2.4.0_2: Dependent port graphics/mesa-dri | mesa-dri-18.3.2_2
failed
[09:05:59] [04] [00:14:45] Skipping x11/xorg-minimal | xorg-minimal-7.5.2_2:
Dependent port graphics/mesa-dri | mesa-dri-18.3.2_2 failed
[09:05:59] [04] [00:14:45] Skipping x11-servers/xorg-server |
xorg-server-1.18.4_11,1: Dependent port graphics/mesa-dri | mesa-dri-18.3.2_2
failed

I do have a backtrace:

. . .
Core was generated by `/usr/bin/cc -cc1 -triple powerpc64-unknown-freebsd13.0
-emit-obj -disable-free -'.
Program terminated with signal SIGABRT, Aborted.
#0  .__sys_thr_kill () at thr_kill.S:3
3       RSYSCALL(thr_kill)
(gdb) bt
#0  .__sys_thr_kill () at thr_kill.S:3
#1  0x00000000133072d0 in __raise (s=330578472) at
/usr/src/lib/libc/gen/raise.c:52
#2  0x00000000132c7898 in abort () at /usr/src/lib/libc/stdlib/abort.c:79
#3  0x00000000132f6c64 in __assert (func=<optimized out>, file=<optimized out>,
line=<optimized out>, failedexpr=<optimized out>) at
/usr/src/lib/libc/gen/assert.c:51
#4  0x00000000130f7c18 in WidenVectorResult () at
/usr/src/contrib/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp:2531
#5  0x0000000012ad91f0 in run () at
/usr/src/contrib/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:281
#6  0x0000000012adfa5c in LegalizeTypes () at
/usr/src/contrib/llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.cpp:1115
#7  0x000000001297ebb4 in CodeGenAndEmitDAG () at
/usr/src/contrib/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:776
#8  0x000000001297e114 in SelectBasicBlock () at
/usr/src/contrib/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:669
#9  0x000000001297cbc4 in SelectAllBasicBlocks () at
/usr/src/contrib/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp:1784
#10 0x0000000000000000 in ?? ()

(gdb) up 4
#4  0x00000000130f7c18 in WidenVectorResult () at
/usr/src/contrib/llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp:2531
2531          assert(!TLI.isOperationLegalOrCustom(N->getOpcode(), WideVecVT)
&&

(gdb) list
2526        // libcalls on the undef elements. We are assuming that if the
scalar op
2527        // requires expanding, then the vector op needs expanding too.
2528        EVT VT = N->getValueType(0);
2529        if (TLI.isOperationExpand(N->getOpcode(), VT.getScalarType())) {
2530          EVT WideVecVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
2531          assert(!TLI.isOperationLegalOrCustom(N->getOpcode(), WideVecVT)
&&
2532                 "Target supports vector op, but scalar requires
expansion?");
2533          Res = DAG.UnrollVectorOp(N, WideVecVT.getVectorNumElements());
2534          break;
2535        }

Unfortunately poudiere bulk tar archives of failures do not
catch the /tmp/* material from:

cc: error: unable to execute command: Abort trap (core dumped)
cc: error: clang frontend command failed due to signal (use -v to see
invocation)
FreeBSD clang version 8.0.0 (tags/RELEASE_800/final 356365) (based on LLVM
8.0.0)
Target: powerpc64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin
cc: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed
source, and associated run script.
cc: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
cc: note: diagnostic msg: /tmp/nir_constant_expressions-b77016.c
cc: note: diagnostic msg: /tmp/nir_constant_expressions-b77016.sh
cc: note: diagnostic msg: 

********************
gmake[5]: *** [Makefile:2829: nir/nir_constant_expressions.lo] Error 1
gmake[5]: *** Waiting for unfinished jobs....
gmake[5]: Leaving directory '/wrkdirs/us

But I managed to repeat the from the context of the tar that
poudriere bulk produced.

-- 
You are receiving this mail because:
You are the assignee for the bug.