llvm dev - Sep 2014 - [LLVMdev] ptrtoint

What kind of C or C++ code will emit a "ptrtoint" op?

Also, what causes i1 to be emitted?

Tia.

Reed

> On Sep 29, 2014, at 1:51 PM, reed kotler <rkotler at mips.com> wrote:
> 
> What kind of C or C++ code will emit a "ptrtoint" op?
This C code:

    long ptrtoint(void *p) { return (long)p; }

gives:

    define i64 @ptrtoint(i8* %p) {
      %1 = ptrtoint i8* %p to i64
      ret i64 %1
    }

> Also, what causes i1 to be emitted?
This C++ code:

    bool i1() { return false; }

gives:

    define zeroext i1 @_Z2i1v() {
      ret i1 false
    }

> Tia.
> 
> Reed
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

Thanks.

So what about a fragment like this: (taken from fast-isel.ll in X86 )

define void @ptrtoint_i1(i8* %p, i1* %q) nounwind {
   %t = ptrtoint i8* %p to i1
   store i1 %t, i1* %q
   ret void
}

TIA.

On 09/29/2014 02:16 PM, Duncan P. N. Exon Smith wrote:
>> On Sep 29, 2014, at 1:51 PM, reed kotler <rkotler at mips.com>
wrote:
>>
>> What kind of C or C++ code will emit a "ptrtoint" op?
> This C code:
>
>      long ptrtoint(void *p) { return (long)p; }
>
> gives:
>
>      define i64 @ptrtoint(i8* %p) {
>        %1 = ptrtoint i8* %p to i64
>        ret i64 %1
>      }
>
>
>> Also, what causes i1 to be emitted?
> This C++ code:
>
>      bool i1() { return false; }
>
> gives:
>
>      define zeroext i1 @_Z2i1v() {
>        ret i1 false
>      }
>
>
>> Tia.
>>
>> Reed
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev