[Bug gas/15504] New: incorrect error message when using LTR opcode with a register operand

[joel.nider at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15504

             Bug #: 15504
           Summary: incorrect error message when using LTR opcode with a
                    register operand
           Product: binutils
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: address@hidden
        ReportedBy: address@hidden
    Classification: Unclassified


When assembling the 'ltr' opcode with a register (%eax) as an operand, gas
gives the following error:
Error: operand type mismatch for 'ltr'

This was discovered by compiling the following inline assembler in GCC:

asm("ltr %0\n" :: am(index) );

When compiled with O0, it was compiled to:

ltr -16(%ebp)

Which assembles correctly.  However, when using O1 (or O2) the compiler knows
to save this value in a register rather than on the stack, producing:

ltr %eax

According to the Intel software manual (document 325462.pdf) it is valid to
give either a register name or memory location as an operand. Therefore I must
conclude that the compiler behaved correctly, and the assembler is incorrectly
rejecting a register as an operand to this instruction.

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