[LLVMbugs] [Bug 21430] New: Redundant spills with MI Scheduler

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Oct 31 05:45:40 PDT 2014


            Bug ID: 21430
           Summary: Redundant spills with MI Scheduler
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: avolkov.intel at gmail.com
                CC: atrick at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13264
  --> http://llvm.org/bugs/attachment.cgi?id=13264&action=edit

On attached test case I see that there are several spills that can be
eliminated with better scheduling.

Use llc to compile it:
llc -mcpu=hsw vs2.ll

When compiling with llc before MI Scheduler was enabled (before r192750) I see
no spills. Using r192750 and also with latest trunk I see spills.

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