[LLVMbugs] [Bug 8631] New: Clang integrated-as doesn't support .2byte .4byte .8byte ASM directives

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Nov 16 21:30:48 PST 2010


           Summary: Clang integrated-as doesn't support .2byte .4byte
                    .8byte ASM directives
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: chandlerc at gmail.com
                CC: rafael.espindola at gmail.com, llvmbugs at cs.uiuc.edu

gdb/testsuite/gdb.arch/amd64-disp-step.S contains:

/* test rip-relative data */
answer: .8byte 42

clang chokes on that:

 clang ../../../src/gdb/testsuite/gdb.arch/amd64-disp-step.S -g -lm -o
/tmp/cc-oCEzi4.s:129:9: warning: ignoring directive for now
answer: .8byte 42

>From binutils/src/gas/doc/c-arm.texi

@cindex @code{.2byte} directive, ARM
@cindex @code{.4byte} directive, ARM
@cindex @code{.8byte} directive, ARM
@item .2byte @var{expression} [, @var{expression}]*
@itemx .4byte @var{expression} [, @var{expression}]*
@itemx .8byte @var{expression} [, @var{expression}]*
These directives write 2, 4 or 8 byte values to the output section.

Even though the doc would lead you to believe that this is ARM-specific,
GNU-as accepts this for x86

Also, gdb/testsuite/gdb.dwarf2/dup-psym.S has:
 .int 0

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