[llvm-bugs] [Bug 39000] New: x86 integrated assembler: & separator not functional in .altmacro mode in some cases

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39000

            Bug ID: 39000
           Summary: x86 integrated assembler: & separator not functional
                    in .altmacro mode in some cases
           Product: new-bugs
           Version: 6.0
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: emaste at freebsd.org
                CC: llvm-bugs at lists.llvm.org
            Blocks: 33405

Found while trying to build the FreeBSD base system entirely with the
integrated assembler.

"In the alternative macro syntax mode the ampersand character (‘&’) can be used
as a separator."

Consider the following snippet:

-------------------------
.altmacro

v_0_0 = 255
.macro w v1,v2
_c_ = v_\v1&_\v2
.word _c_
.endm

w 0 0
-------------------------

GNU as and gcc assemble this by evaluating _c_ = v_0_0, producing .word 255.

Clang IAS produces:
<instantiation>:1:10: error: expression could not be evaluated
_c_ = v_0&_0
         ^


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=33405
[Bug 33405] [meta] Using the integrated assembler to build the FreeBSD base
system (kernel + world)
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