[llvm-bugs] [Bug 35831] New: After r315899, labels after x86 prefixes cause errors

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35831

            Bug ID: 35831
           Summary: After r315899, labels after x86 prefixes cause errors
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: llvm-bugs at lists.llvm.org

Related to bug 35741, after https://reviews.llvm.org/rL315899 (fixing
x86 prefix issues related to bug 7709, bug 17697, bug 19251, bug 32809
and bug 21640), labels directives directly after an x86 instruction
prefix are no longer accepted.

For example (this is derived from openjdk8 sources, see [1]):

        cmp $0, %edx
        je 1f
        lock
1:      cmpxchgl %ecx,(%rdi)

This is accepted by both clang before r315899 and GNU as, but clang r315899
gives:

lock-label.s:4:2: error: unknown token in expression
1:      cmpxchgl %ecx,(%rdi)
 ^
lock-label.s:2:5: error: directional label undefined
        je 1f
           ^

[1]
http://hg.openjdk.java.net/jdk8/jdk8/hotspot/file/87ee5ee27509/src/os_cpu/linux_x86/vm/atomic_linux_x86.inline.hpp#l48

-- 
You are receiving this mail because:
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-bugs/attachments/20180105/8b8094b7/attachment-0001.html>