[LLVMbugs] [Bug 16588] New: Support unqualified btr, bts

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Jul 10 11:35:13 PDT 2013


            Bug ID: 16588
           Summary: Support unqualified btr, bts
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: artagnon at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

I happened to notice that linux.git uses plenty of btr and bts
instructions (not btrl, btrw, btsl, btsw).  For examples, see
arch/x86/include/asm/bitops.h.  LLVM barfs on these due to ambiguity,
while GNU as is fine with them.  Surely, there must be architectures
where the w/l variant is unavailable?  LLVM must support those
architectures, no?

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