[LLVMbugs] [Bug 23936] New: [powerpc-ubuntu] code generation failure for some OpenCL built-ins

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23936

            Bug ID: 23936
           Summary: [powerpc-ubuntu] code generation failure for some
                    OpenCL built-ins
           Product: new-bugs
           Version: trunk
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: kanagak86 at yahoo.ca
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14513
  --> https://llvm.org/bugs/attachment.cgi?id=14513&action=edit
coge generator bug from PPC

The attached file causes a crash on PPC64 (Power 8) - Ubuntu 3.16.0-23-generic. 

The workload is from OpenCL 1.1 built-ins. There were couple of built-ins build
failure on vector data type; int, long, float with vec size; 8 or 16. Some of
the builtins examples: mul_hi_long, asin_h (vec16) and etc. 

The last revision that it worked on was 3.6 r222776.  

The problem seem to be there for all 3.6.1.  

I have attached simplified version of the code generator bug created from bug
point.  

Here's the snap shot of the Error: 

Impossible reg-to-reg copy
UNREACHABLE executed at PPCInstrInfo.cpp:768!
#0 0x10a55b5c llvm::sys::PrintStackTrace(_IO_FILE*)
(/home/kajank/compiler/llvm_361_r240134/Release+Asserts/bin/llc+0x10a55b5c)
#1 0x10a56998 PrintStackTraceSignalHandler(void*)
(/home/kajank/compiler/llvm_361_r240134/Release+Asserts/bin/llc+0x10a56998)
#2 0x10a57368 SignalHandler(int)
(/home/kajank/compiler/llvm_361_r240134/Release+Asserts/bin/llc+0x10a57368)
0  llc       0x0000000010a55b5c llvm::sys::PrintStackTrace(_IO_FILE*) + 120
1  llc       0x0000000010a56998
2  llc       0x0000000010a57368
3            0x00003fff94ee0478 __kernel_sigtramp_rt64 + 0
4  libc.so.6 0x00003fff94a006b8 gsignal + 72
5  libc.so.6 0x00003fff94a0295c abort + 636
6  llc       0x0000000010a3b3d0 llvm::llvm_unreachable_internal(char const*,
char const*, unsigned int) + 684
7  llc       0x00000000101a8e40
llvm::PPCInstrInfo::copyPhysReg(llvm::MachineBasicBlock&,
llvm::MachineBasicBlock::bundle_iterator<llvm::MachineInstr,
llvm::ilist_iterator<llvm::MachineInstr> >, llvm::DebugLoc, unsigned int,
unsigned int, bool) const + 2280
8  llc       0x00000000104270cc
9  llc       0x00000000104a702c
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 216
10 llc       0x000000001095595c
llvm::FPPassManager::runOnFunction(llvm::Function&) + 424
11 llc       0x0000000010955cb8 llvm::FPPassManager::runOnModule(llvm::Module&)
+ 72
12 llc       0x0000000010956360
llvm::legacy::PassManagerImpl::run(llvm::Module&) + 1088
13 llc       0x00000000109569dc llvm::legacy::PassManager::run(llvm::Module&) +
28
14 llc       0x00000000100f8da0 main + 7744
15 libc.so.6 0x00003fff949e4e80
16 libc.so.6 0x00003fff949e5074 __libc_start_main + 196
Stack dump:
0.      Program arguments: llc bugpoint-reduced-simplified.bc
1.      Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.bc'.
2.      Running pass 'Post-RA pseudo instruction expansion pass' on function
'@mul_hi_long8'
Aborted

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