[LLVMbugs] [Bug 4321] New: linearscan leaves virtual register in MBB livein set

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Wed Jun 3 18:22:36 PDT 2009


           Summary: linearscan leaves virtual register in MBB livein set
           Product: libraries
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Common Code Generator Code
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: gohman at apple.com
                CC: llvmbugs at cs.uiuc.edu

In the attached testcase compiled with

  llc -march=x86 -print-machineinstrs

basic block bb246 has virtual register %reg1025 in its livein
set after register allocation.

When the post-RA scheduler is enabled (with
-disable-post-RA-scheduler=false), this leads to an assertion
failure because it doesn't expect to find virtual registers
in MBB livein sets.

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