[LLVMbugs] [Bug 6347] New: [X86] : wrong code generated for shufflevector

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=6347

           Summary: [X86] : wrong code generated for shufflevector
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: jgu222 at gmail.com
                CC: llvmbugs at cs.uiuc.edu


Reproduce as follows:
------------------------
% tar -xvzf vshuffle.tarz

% llvm-gcc l_test.c -c
% llvm-as l_k2.ll
% opt -O2 l_k2.bc -o optim.bc
% cp l_k2.bc nonopt.bc
% llc optim.bc
% llc nonopt.bc
% gcc l_test.o optim.s -o optim
% gcc l_test.o nonopt.s -o nonopt
% ./nonopt
Pass
%/optim
Fail


The failed one went through opt. However, the optim.bc looks correct. And
optim.bc has shufflevector and nonopt.bc does not, and I think shufflevector
causes the problem.

l_k2.ll is equivalent to k2.c (in the tarball), so it is easy for you to see
what it is doing.


-----------------------
llvm:  llvm version 2.7svn (DEBUG build, 2/18/2010,  i386-pc-linux-gnu)
       revision 96603
llvm-gcc:  gcc vesion 4.2.1 (Based on Apple Inc. build 5658)

My system is ubuntu 9.10 32bit, running on intel pc.


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