[LLVMbugs] [Bug 16323] New: ARM FastISel is disabled for MCJIT

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Jun 13 10:40:11 PDT 2013


            Bug ID: 16323
           Summary: ARM FastISel is disabled for MCJIT
           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/ExecutionEngine/TargetSelect.cpp:EngineBuilder::selectTarget disables ARM
FastISel by changing OptLevel == CodeGenOpt::None to OptLevel ==

The issue shows up when running an ARM self-hosted test-suite and running MCJIT
tests at O0, e.g.:
  armv7-unknown-linux-gnueabihf-lli -use-mcjit -O0
-disable-lazy-compilation=false ../llvm/test/ExecutionEngine/MCJIT/pr13727.ll

The generated code is wrong and causes a crash.

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