Determine if iOS device is 32- or 64-bit

Question

Does anyone know of an easy way to tell if an iOS7 device has 32- or 64-bit hardware? I don't mean programmatically, I just mean via settings, model number, 3rd-party app, etc.

I'm having a problem that I suspect is 64-bit related. Apple's advice is to test on the 64-bit simulator but also on an actual 64-bit device, but then doesn't say anything about how to determine that. I can write a test app to check sizeof(int) or whatever, but there's got to be some way for, say, tech support to know what they're working with.

Eric

Answer 1

There is no other "official" way to determine it. You can determine it using this code:

if (sizeof(void*) == 4) {     NSLog(@"32-bit App"); } else if (sizeof(void*) == 8) {     NSLog(@"64-bit App"); } 

Answer 2

Below is the method is64bitHardware. It returns YES if the hardware is a 64-bit hardware and works on a real iOS device and in an iOS Simulator. Here is source.

#include <mach/mach.h>  + (BOOL) is64bitHardware { #if __LP64__     // The app has been compiled for 64-bit intel and runs as 64-bit intel     return YES; #endif      // Use some static variables to avoid performing the tasks several times.     static BOOL sHardwareChecked = NO;     static BOOL sIs64bitHardware = NO;      if(!sHardwareChecked)     {         sHardwareChecked = YES;  #if TARGET_IPHONE_SIMULATOR         // The app was compiled as 32-bit for the iOS Simulator.         // We check if the Simulator is a 32-bit or 64-bit simulator using the function is64bitSimulator()         // See http://blog.timac.org/?p=886         sIs64bitHardware = is64bitSimulator(); #else         // The app runs on a real iOS device: ask the kernel for the host info.         struct host_basic_info host_basic_info;         unsigned int count;         kern_return_t returnValue = host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)(&host_basic_info), &count);         if(returnValue != KERN_SUCCESS)         {             sIs64bitHardware = NO;         }          sIs64bitHardware = (host_basic_info.cpu_type == CPU_TYPE_ARM64);  #endif // TARGET_IPHONE_SIMULATOR     }      return sIs64bitHardware; }