[LLVMbugs] [Bug 10046] New: The Mips code generator fails during the Greedy Register Allocator pass.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10046

           Summary: The Mips code generator fails during the Greedy
                    Register Allocator pass.
           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: rich at pennware.com
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=6665)
 --> (http://llvm.org/bugs/attachment.cgi?id=6665)
LLVM assembly test case.

The attached test cases fails for Mips:

[~/ellcc/libecc/obj/mips/linux/c] main% ~/vendor/llvm-build/bin/llc
MipsGRAassert.ll 
llc: /home/rich/vendor/llvm-build/llvm/lib/CodeGen/SplitKit.cpp:180: bool
llvm::SplitAnalysis::calcLiveBlockInfo(): Assertion `BI.FirstUse >= Start'
failed.
0  llc             0x0000000000f4b6cf
1  llc             0x0000000000f4c20a
2  libpthread.so.0 0x00000037bea0eeb0
3  libc.so.6       0x00000037bde330c5 gsignal + 53
4  libc.so.6       0x00000037bde34a76 abort + 390
5  libc.so.6       0x00000037bde2b905 __assert_fail + 245
6  llc             0x0000000000be0777
7  llc             0x0000000000be0b20 llvm::SplitAnalysis::analyzeUses() + 512
8  llc             0x0000000000b7fcda
9  llc             0x0000000000b697bb llvm::RegAllocBase::allocatePhysRegs() +
267
10 llc             0x0000000000b7ce4b
11 llc             0x0000000000e7ac1f
llvm::FPPassManager::runOnFunction(llvm::Function&) + 655
12 llc             0x0000000000e7acdb
llvm::FPPassManager::runOnModule(llvm::Module&) + 75
13 llc             0x0000000000e7a717
llvm::MPPassManager::runOnModule(llvm::Module&) + 551
14 llc             0x0000000000e7a87b llvm::PassManagerImpl::run(llvm::Module&)
+ 187
15 llc             0x000000000055524a main + 4970
16 libc.so.6       0x00000037bde1ee5d __libc_start_main + 253
17 llc             0x0000000000552f69
Stack dump:
0.      Program arguments: /home/rich/vendor/llvm-build/bin/llc
MipsGRAassert.ll 
1.      Running pass 'Function Pass Manager' on module 'MipsGRAassert.ll'.
2.      Running pass 'Greedy Register Allocator' on function '@mergesort'
Abort (core dumped)
[~/ellcc/libecc/obj/mips/linux/c] main%

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