[LLVMbugs] [Bug 11403] New: [x86 disassembler] is "fucompi" documented Intel syntax?

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=11403

             Bug #: 11403
           Summary: [x86 disassembler] is "fucompi" documented Intel
                    syntax?
           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
    Classification: Unclassified


>From the "Intel® 64 and IA-32 Architectures Software Developer’s Manual
Volume 2 (2A & 2B): Instruction Set Reference, A-Z", p. 3-348:
DF E8+i FUCOMIP ST, ST(i) 
Compare ST(0) with ST(i), check for ordered values, set status flags
accordingly, and pop register stack

Using llvm-mc built from r144979:
$ echo '0xdf 0xe9' |./llvm-mc -disassemble -triple="x86_64"
-x86-asm-syntax="intel"
    fucompi    ST(1)

I'm guessing that "fucompi" is some AT&T syntax shortcut to omit the ST
operand, but this isn't documented anywhere by Intel that I can find. When
specifying Intel syntax, should this disassemble as specified by Intel:

fucomip ST, ST(1)

-- 
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.