[LLVMbugs] [Bug 2634] New: Remat applied to updated value

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Mon Aug 4 15:44:00 PDT 2008


           Summary: Remat applied to updated value
           Product: libraries
           Version: 2.3
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Register Allocator
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: greened at obbligato.org
                CC: llvmbugs at cs.uiuc.edu

In SPEC CPU 2006 leslie3d, a value is spilled, split and one of the splits is
spilled again.  The value happens to be rematable and when the split interval
is spilled two-address rewriting causes the enregistered value to be changed. 
But live interval analysis has outdated information and thinks it can insert a
remat of the old value just after the new value is written to the register.

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