[LLVMbugs] [Bug 14749] New: UNREACHABLE executed: Cannot emit physreg copy instruction !

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14749

             Bug #: 14749
           Summary: UNREACHABLE executed: Cannot emit physreg copy
                    instruction !
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: antoine.balestrat at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Hello ! The following testcase fails to compile with LLVM/Clang 3.3 as of
171199.

$ cat postra.c
int a, b;

void f(void)
{
    unsigned short *p = 1;

    for(*p = 0; *p < 16; ++*p)
        a *= b != *p - b;
}

$ clong -O2 -w postra.c
Cannot emit physreg copy instruction
UNREACHABLE executed at
/home/merkil/git/clang/llvm/lib/Target/X86/X86InstrInfo.cpp:2926!
0  clang           0x0000000001ad0eff
1  clang           0x0000000001ad13e3
2  libpthread.so.0 0x00007ffbd2a42910
3  libc.so.6       0x00007ffbd1cabff5 gsignal + 53
4  libc.so.6       0x00007ffbd1cad307 abort + 327
5  clang           0x0000000001abf03f llvm::llvm_unreachable_internal(char
const*, char const*, unsigned int) + 463
6  clang           0x000000000137f93a
7  clang           0x000000000166852e
8  clang           0x00000000015a7764
llvm::MachineFunctionPass::runOnFunction(llvm::Function&) + 116
9  clang           0x0000000001a733ac
llvm::FPPassManager::runOnFunction(llvm::Function&) + 444
10 clang           0x0000000001a735ab
llvm::FPPassManager::runOnModule(llvm::Module&) + 59
11 clang           0x0000000001a7391e
llvm::MPPassManager::runOnModule(llvm::Module&) + 494
12 clang           0x0000000001a73f28 llvm::PassManagerImpl::run(llvm::Module&)
+ 456
13 clang           0x0000000001a740ca llvm::PassManager::run(llvm::Module&) +
10
14 clang           0x00000000007aec37
clang::EmitBackendOutput(clang::DiagnosticsEngine&, clang::CodeGenOptions
const&, clang::TargetOptions const&, clang::LangOptions const&, llvm::Module*,
clang::BackendAction, llvm::raw_ostream*) + 6007
15 clang           0x00000000007ac70a
16 clang           0x00000000008e2185 clang::ParseAST(clang::Sema&, bool, bool)
+ 549
17 clang           0x00000000007ab75c clang::CodeGenAction::ExecuteAction() +
204
18 clang           0x000000000064938a clang::FrontendAction::Execute() + 106
19 clang           0x000000000062a6ad
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 989
20 clang           0x00000000006107f0
clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 3936
21 clang           0x00000000006073f6 cc1_main(char const**, char const**, char
const*, void*) + 694
22 clang           0x000000000060c836 main + 3542
23 libc.so.6       0x00007ffbd1c98985 __libc_start_main + 245
24 clang           0x000000000060707d
Stack dump:
0.    Program arguments: /home/merkil/git/clang/build/Release+Asserts/bin/clang
-cc1 -triple x86_64-unknown-linux-gnu -emit-obj -disable-free -main-file-name
postra.c -mrelocation-model static -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
-target-linker-version 2.23.1 -momit-leaf-frame-pointer -resource-dir
/home/merkil/git/clang/build/Release+Asserts/bin/../lib/clang/3.3
-fmodule-cache-path /var/tmp/clang-module-cache -internal-isystem
/usr/local/include -internal-isystem
/home/merkil/git/clang/build/Release+Asserts/bin/../lib/clang/3.3/include
-internal-externc-isystem /include -internal-externc-isystem /usr/include -O2
-w -fdebug-compilation-dir /home/merkil -ferror-limit 19 -fmessage-length 0
-mstackrealign -fobjc-runtime=gcc -fdiagnostics-show-option -backend-option
-vectorize-loops -o /tmp/postra-ERytGB.o -x c postra.c 
1.    <eof> parser at end of file
2.    Code generation
3.    Running pass 'Function Pass Manager' on module 'postra.c'.
4.    Running pass 'Post-RA pseudo instruction expansion pass' on function '@f'
clang: error: unable to execute command: Aborted
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang version 3.3 (trunk 171199)
Target: x86_64-unknown-linux-gnu
Thread model: posix
clang: note: diagnostic msg: PLEASE submit a bug report to
http://llvm.org/bugs/ and include the crash backtrace, preprocessed source, and
associated run script.

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