[LLVMbugs] [Bug 12010] New: BranchProbabilityInfo::getSumForBlock asserts

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12010

             Bug #: 12010
           Summary: BranchProbabilityInfo::getSumForBlock asserts
           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: ahatanak at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8058
  --> http://llvm.org/bugs/attachment.cgi?id=8058
.ll file

This is the command I ran:
$ llc pr35800.ll -o - -mcpu=mips64r2 -mattr=n64 -debug

llc:
/home/ahatanaka/projects/llvm/trunk-rw1/llvm/lib/Analysis/BranchProbabilityInfo.cpp:430:
uint32_t llvm::BranchProbabilityInfo::getSumForBlock(const llvm::BasicBlock*)
const: Assertion `Sum > PrevSum' failed.

Program received signal SIGABRT, Aborted.
0x00007ffff6ebea75 in *__GI_raise (sig=<value optimized out>)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
64    ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.
    in ../nptl/sysdeps/unix/sysv/linux/raise.c


It seems that the type of Sum (unit32_t) is not large enough to hold Sum +
Weight: 

(gdb) up
#3  0x000000000111ee7a in llvm::BranchProbabilityInfo::getSumForBlock (
    this=0x1e9b0e0, BB=0x1e7e740)
    at
/home/ahatanaka/projects/llvm/trunk-rw1/llvm/lib/Analysis/BranchProbabilityInfo.cpp:430
430        assert(Sum > PrevSum); (void) PrevSum;
(gdb) p /x Sum
$6 = 0x60
(gdb) p /x PrevSum
$7 = 0xf0000060
(gdb) p /x Weight
$8 = 0x10000000

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