[LLVMbugs] [Bug 16320] New: ARM FastISel disabled for Thumb2 on non-iOS targets

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Jun 13 10:29:45 PDT 2013


            Bug ID: 16320
           Summary: ARM FastISel disabled for Thumb2 on non-iOS targets
           Product: libraries
           Version: trunk
          Hardware: Other
                OS: Linux
            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 enables FastISel in the
following circumstances:
    bool UseFastISel = false;
    UseFastISel |= Subtarget->isTargetIOS() && !Subtarget->isThumb1Only();
    UseFastISel |= Subtarget->isTargetLinux() && !Subtarget->isThumb();
    UseFastISel |= Subtarget->isTargetNaCl() && !Subtarget->isThumb();

Thumb2 FastISel has issues with at least some relocations as well as with MI
validation, but should otherwise be able to use FastISel.

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