[LLVMbugs] [Bug 11026] New: [x86 assembler] rdrand not recognized?

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11026

           Summary: [x86 assembler] rdrand not recognized?
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: kkhoo at perfwizard.com
                CC: llvmbugs at cs.uiuc.edu


>From the "Intel® 64 and IA-32 Architectures Software Developer’s Manual
Volume 2 (2A & 2B): Instruction Set Reference, A-Z", p. 4-309, dated May 2011:

RDRAND—Read Random Number

0F C7 /6
RDRAND r16

0F C7 /6
RDRAND r32

REX.W + 0F C7 /6
RDRAND r64

See also: http://en.wikipedia.org/wiki/RdRand

Using:
$ clang -v
Apple clang version 2.0 (tags/Apple/clang-139) (based on LLVM 2.9svn)
Target: x86_64-apple-darwin10
Thread model: posix

$ cat avx.s
rdrand $rax

$ clang -mavx avx.s -c
/var/folders/J5/J5ahEYzWEFC1BPEW37amTE+++TM/-Tmp-/cc-5nMsF2.s:5:1: error:
invalid instruction mnemonic 'rdrand'

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