[LLVMbugs] [Bug 3385] New: clang rejects input constraint 'er' in asm

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3385

           Summary: clang rejects input constraint 'er' in asm
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Semantic Analyzer
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: bagnara at cs.unipr.it
                CC: llvmbugs at cs.uiuc.edu, bolzoni at cs.unipr.it


This comes from linux-2.6.28.1:

$ cat /tmp/bug27.c 
typedef struct {
        long counter;
} atomic64_t;

inline void atomic64_sub(long i, atomic64_t *v)
{
        asm volatile("subq %1,%0"
                     : "=m" (v->counter)
                     : "er" (i), "m" (v->counter));
}
$ gcc -c -W -Wall  /tmp/bug27.
$ icc -c -Wall  /tmp/bug27.c
$ clang /tmp/bug27.c
/tmp/bug27.c:9:24: error: invalid input constraint 'er' in asm
                     : "er" (i), "m" (v->counter));
                       ^
1 diagnostic generated.
$


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