[LLVMbugs] [Bug 4400] New: Structure Alignment in MSVC

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4400

           Summary: Structure Alignment in MSVC
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Keywords: portability
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: manoel at fonetica.com.br
                CC: llvmbugs at cs.uiuc.edu


In Windows plataform with  MSVC:

target datalayout =
"p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:1-f80:32:32"
        %FIRSTSTRU = type { i32,  double, i32, i8* }

If I define a strucutre like %FIRSTSTRU and a function like :

define i32 @STRUFUN(%FIRSTSTRU* %OUTRASTRU) {
entry:



   ret i32 1
}

 in the C side I do

struct  xfirstStru 
{
        int     var1;
        double  var2;
        int     var3;
        char    *var4;
};
typedef  struct xfirstStru      osX ;
typedef  osX* PosX ;

PosX    xf      = (PosX)        malloc( sizeof(osX) );
char *paux      = (char*)       malloc( 256 );
strcpy(paux,"teste C - LLVM");
memset(xf,0,sizeof(osX));
and we call the LLVM function from the C function,
fp_StruFun(xf);

the fields , from the double one, are not at the expected position.


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