[LLVMbugs] [Bug 11291] New: LLVM 3.0rc2: popcnt instruction fails on OSX (invalid suffix)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11291

             Bug #: 11291
           Summary: LLVM 3.0rc2: popcnt instruction fails on OSX (invalid
                    suffix)
           Product: new-bugs
           Version: 2.9
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: davidterei at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 7570
  --> http://llvm.org/bugs/attachment.cgi?id=7570
testcase

I've attached a small test case that produces assembly code that the assemblers
on OSX can't handle. OSX doesn't handle the length suffixes on the popcnt
instruction (e.g. {w,l,q}).

Here is a related GCC bug for this issue:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34497#c14

I believe they fixed it by not adding the suffix on OSX, which works fine.
Indeed changing instruction definition in lib/Target/X86/X86InstrSSE.td to drop
the suffix, works fine.

The integrated assembler of llc works fine but GHC which uses LLVM can't use
the integrated assembler at this stage as we do some assembly post processing.

== To Reproduce ==

1. llc testcase.ll -o testcase.s
2. gcc -m32 -c testcase.s -o b.o
(or as -arch i386 testcase.s)

== Expected Output ==

Shiny object file

== Actual Output ==

testcase.s:7:suffix or operands invalid for `popcnt'

-- 
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.