[LLVMbugs] [Bug 17352] New: powerpc integrated-as can't emit nop sequences

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Sep 24 17:33:28 PDT 2013


http://llvm.org/bugs/show_bug.cgi?id=17352

            Bug ID: 17352
           Summary: powerpc integrated-as can't emit nop sequences
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: MC
          Assignee: unassignedbugs at nondot.org
          Reporter: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

As of r191105, we don't support "file bytes with nops" very well or maybe at
all:

echo '.byte 00,00,00
.align 2' | llvm-mc -arch=ppc64 -filetype=obj
ELFp@@LLVM ERROR: unable to write nop sequence of 1 bytes

You can remove bytes and get it to say sequence of 2 bytes or 3 bytes. This
turns up in openssl's "sha1-ppc.S".

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