[LLVMbugs] [Bug 16322] New: ARM FastISel emits wrong code when omitting frame pointers and the frames are huge

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16322

            Bug ID: 16322
           Summary: ARM FastISel emits wrong code when omitting frame
                    pointers and the frames are huge
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: ARM
          Assignee: unassignedbugs at nondot.org
          Reporter: jfb at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

lib/Target/ARM/ARMFastISel.cpp:ARM::createFastISel has the following code:
      // iOS always has a FP for backtracking, force other targets
      // to keep their FP when doing FastISel. The emitted code is
      // currently superior, and in cases like test-suite's lencod
      // FastISel isn't quite correct when FP is eliminated.
      TM.Options.NoFramePointerElim = true;

FastISel should be able to omit frame pointers with correct code that performs
well. It currently falls short on both accounts.

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