[LLVMbugs] [Bug 9979] New: VerifyCoalescing failure on MultiSource/Benchmarks/btSoftBody.cpp on x86_64

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9979

           Summary: VerifyCoalescing failure on
                    MultiSource/Benchmarks/btSoftBody.cpp on x86_64
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: zwarich at apple.com
                CC: llvmbugs at cs.uiuc.edu


I've attached a reduction. Here's the error:

*** Bad machine code: Value live out of predecessor doesn't have PHIKill ***
- function:    _ZN15btSoftColliders12CollideVF_SS7ProcessEPK10btDbvtNodeS3_
Valno #2 live out of BB#1 at 192S doesn't have PHIKill, but Valno #1 is PHIDef and
defined at the beginning of BB#3 at 272L in %vreg20 =
[96d,240d:2)[240d,272L:0)[272L,464d:1)[464d,496d:3)  0 at 240d-phikill
1 at 272L-phidef 2 at 96d 3 at 464d
LLVM ERROR: Found 1 machine code errors.

All of the remaining verifier failures on the non-External test-suite are due
to missing phikill flags, so I suspect they are all instances of this same bug.

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