[LLVMbugs] [Bug 3788] New: asm inline : support casting on input operand

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3788

           Summary: asm inline : support casting on input operand
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Semantic Analyzer
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: castet.matthieu at free.fr
                CC: llvmbugs at cs.uiuc.edu


Hi :

$ cat /tmp/p.c 
int foo()
{
        int a;
        asm("nop"
                        :
                        : "m"((int)(a))
                        );
}

$ ./llvm/tools/clang/tools/ccc/ccc /tmp/p.c -c -o /tmp/p.o
/tmp/p.c:6:10: error: invalid lvalue in asm input for constraint 'm'
                        : "m"((int)(a))
                              ^~~~~~~~
1 diagnostic generated.


The casting should be the same thing than doing :

int foo()
{
        int a;
         int tmp = a;
        asm("nop"
                        :
                        : "m"(tmp)
                        );
}


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