[LLVMbugs] [Bug 15142] New: incorrect branch instruction selection

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Fri Feb 1 18:21:05 PST 2013


             Bug #: 15142
           Summary: incorrect branch instruction selection
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: PowerPC
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: compnerd at compnerd.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 9958
  --> http://llvm.org/bugs/attachment.cgi?id=9958

bdz has a range of -0x8000 to 0x7fff.  However, it is being emitted for a jump
to 0x95bc.  The attached preprocessed output of h264.c is able to reproduce the

$ /home/compnerd/sandbox/llvm/build/Debug+Asserts/bin/clang -w -target
powerpc-unknown-linux-gnu -fPIC -g -O3 -S h264.i
h264.s: Assembler messages:
h264.s:6318: Error: operand out of range (0x000095bc is not between 0xffff8000
and 0x00007ffc)

Seems like PPCBSel is not correctly selecting the jump operation.

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