[LLVMbugs] [Bug 6914] New: Instruction does not dominate all uses

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6914

           Summary: Instruction does not dominate all uses
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu, chenyang at cs.utah.edu


Seen on x64 Linux.  I cannot repro with opt.

[regehr at gamow tmp408]$ clang -v
clang version 1.5 (trunk 102110)
Target: x86_64-unknown-linux-gnu
Thread model: posix

[regehr at gamow tmp408]$ clang -O -c -w small.c

Instruction does not dominate all uses!
  %tmp7 = load i16* %tmp6                         ; <i16> [#uses=1]
  %tmp = trunc i16 %tmp7 to i8                    ; <i8> [#uses=2]
Instruction does not dominate all uses!
  %tmp = trunc i16 %tmp7 to i8                    ; <i8> [#uses=2]
  %tmp23 = mul i8 %tmp, -2                        ; <i8> [#uses=1]
Instruction does not dominate all uses!
  %tmp = trunc i16 %tmp7 to i8                    ; <i8> [#uses=2]
  %tmp24 = mul i8 %tmp, -1                        ; <i8> [#uses=1]
Instruction does not dominate all uses!
  %1 = add i8 %0, %tmp24                          ; <i8> [#uses=1]
  %lsr.iv.next = add i8 %lsr.iv, %1               ; <i8> [#uses=1]
Broken module found, compilation aborted!
0  clang           0x00000000012582af
1  clang           0x000000000125a1b2
2  libpthread.so.0 0x00007f6410bdf190
3  libc.so.6       0x00007f640fee54b5 gsignal + 53
4  libc.so.6       0x00007f640fee8f50 abort + 384
5  clang           0x000000000120304f
6  clang           0x00000000011db66d
7  clang           0x00000000011db84b
8  clang           0x00000000011dbb0f
9  clang           0x0000000000415647
10 clang           0x0000000000415ec5
11 clang           0x00000000006102bf
12 clang           0x00000000004199b1
13 clang           0x0000000000409ccb
14 clang           0x000000000040d043 main + 2499
15 libc.so.6       0x00007f640fed0abd __libc_start_main + 253
16 clang           0x00000000004074f9
Stack dump:
0.    Program arguments:
/uusoc/exports/scratch/regehr/z/compiler-install/llvm-gcc-r102110-install/bin/clang
-cc1 -triple x86_64-unknown-linux-gnu -S -disable-free -main-file-name small.c
-mrelocation-model static -mdisable-fp-elim -mconstructor-aliases
-munwind-tables -target-cpu x86-64 -resource-dir
/uusoc/exports/scratch/regehr/z/compiler-install/llvm-gcc-r102110-install/lib/clang/1.5
-O2 -w -ferror-limit 19 -ftemplate-backtrace-limit 10 -fmessage-length 89
-fgnu-runtime -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/cc-YT2vqr.s
-x c small.c 
1.    <eof> parser at end of file
2.    Code generation
3.    Running pass 'Module Verifier' on function '@int323'
clang: error: compiler command failed due to signal 6 (use -v to see
invocation)

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