[LLVMbugs] [Bug 3934] New: Assertion failed: (isNew && "Can' t map to two src physical registers!"), function ProcessCopy

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3934

           Summary: Assertion failed: (isNew && "Can't map to two src
                    physical registers!"), function ProcessCopy
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: ed at 80386.nl
                CC: llvmbugs at cs.uiuc.edu
            Blocks: 3696


Created an attachment (id=2782)
 --> (http://llvm.org/bugs/attachment.cgi?id=2782)
Testcase

When compiling the attached code with Clang on AMD64 with at least -O1 enabled,
I'm seeing the following failed assertion:

Assertion failed: (isNew && "Can't map to two src physical registers!"),
function ProcessCopy, file .../llvm/lib/CodeGen/TwoAddressInstructionPass.cpp,
line 591.
Stack dump:
0.      Program arguments: /usr/bin/../libexec/clang-cc -triple
x86_64-undermydesk-freebsd8.0 -S -disable-free --relocation-model static
--disable-fp-elim --unwind-tables=1 --fmath-errno=1 -O1 -o /tmp/cc-9EhLJ2.s -x
c /home/ed/llvm-crash.c 
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Two-Address instruction pass' on function '@__bswap16'

When passing -O2, the following crash is observed:

Assertion failed: (isNew && "Can't map to two src physical registers!"),
function ProcessCopy, file .../llvm/lib/CodeGen/TwoAddressInstructionPass.cpp,
line 591.
Stack dump:
0.      Program arguments: /usr/bin/../libexec/clang-cc -triple
x86_64-undermydesk-freebsd8.0 -S -disable-free --relocation-model static
--disable-fp-elim --unwind-tables=1 --fmath-errno=1 -O2 -o /tmp/cc-PZNza1.s -x
c /home/ed/llvm-crash.c 
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Two-Address instruction pass' on function
'@config_get_hosts'

This prevents the FreeBSD source tree from being built.


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