[LLVMbugs] [Bug 21105] New: inline asm doesn't support %z0

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Sep 30 17:12:39 PDT 2014


            Bug ID: 21105
           Summary: inline asm doesn't support %z0
           Product: clang
           Version: 3.4
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: llvmbugzilla at limegreensocks.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

clang version 3.5.0 (217039)
Target: i686-pc-windows-gnu
Thread model: posix

Compiling this code with "clang z2.cpp":

int main(int argc, char *argv[])
  int a = 3;

   asm volatile ("add%z0 $4, %0": "=m" (a));

Gives these errors:
z2.cpp:5:18: error: invalid operand in inline asm: 'add${0:z} $$4, $0'
   asm volatile ("add%z0 $4, %0": "=m" (a));
z2.cpp:5:18: error: ambiguous instructions require an explicit suffix (could be
'addb', 'addw', 'addl', or 'addq')
<inline asm>:1:2: note: instantiated into assembly here
        add $4, -12(%ebp)
2 errors generated.

Note that this code compiles correctly with gcc.  See also the gcc docs at

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